•
OPERATION
•
MAINTENANCE
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om
INSTALLATION
Westinghouse 1. L 41-766.1 A
INSTRUCTIONS
putting
Before
protective
relays
iron frame, mounted on the moulded basr,
supports the co�l and serves as the external
magnet i c
path for the coil.
The
coil
surrounds
a core and flux shunt.
The upper
end
of the core is threaded and
projects
through the upper side of the frame, to which
it is fastened by a nut.
A tube threaded on
the outside at its lower end is assembled in
the core, and the threaded end extends below
A graphite bushing, which is the
the core.
lower bearing for the plunger shaft, is as­
sembled in the lower end of this threaded
tube. It is held in place by two split spring
sleeves, one above and one below the bearing.
The split sleeves must be compressed to insert
them in the tube and they will remain at any
position in which they are placed.
The bearin¥ for the upper end of the plunger shaft is
a graphite bushing which is pressed in the upper end of the core.
This bearing is visible
when the plunger is in the energized position.
The plunger itself does not touch the walls of
tho tube in which it moves.
tM
into service, remove all blocking which may
have been inserted for the purpose of securing
make sure that all
the parts during shipment,
moving parts operate freely, inspect the con­
tacts to see that they are clean and close
properly, and operate the relay to check the
settings and electrical connections.
an
CAUTION
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ls
TYPES SC. SCl. SV AND SV-1 BELAYS
APPLICATION
The
SC
drop-out
and
to
SV
relays
pick-up
have
particularly
suitable
a
high
(go to 980�) and
lec
of
type
tri
ca
lP
ar
The types SC and SC-1 current relays and the
types SV and SV-1 voltage relays are applica­
ble where an instantaneous plunger relay of
high accuracy is required. These relays are
suitable for protective service, and for aux­
iliary service where some of their special
features are desired.
They are adjustable
ever a w�de range of voltage or current, are
provided with mechanical operation indicators,
and have a calibrated scale which indicates
Both contact� can
setting.
pick-up
the
readily be changed from "make" to "break". The
volt-ampere burden is low.
for
fault
ratio
are
detector
w
.E
relays. Tho type SC-1 and SV-1 relays have a
lower ratio
of drop-out to pick-up. This
lower ratio may be desirable in some appli­
cations, and it makes possible a plunger pull
characteristic which permits the operation of
a latching device. The latch is combined with
the mechanical operation indicator, and pre­
vents further motion of the moving contacts
after the relay has operated.
CONSTRUCTION
ww
The types SC, SC-1, SV and SV-l relays oper­
ate on the solenoid principle.
A U-shaped
SUPERSEDES I. L. 41-766.1
"Denotes changed from superseded issue.
A
flux shunt whtch surrounds the core is
screwed on the tube, and its lower end pro1'112 position of
jects below the relay frame.
this shunt d ete rmines the pick-up setting
of
the relay.
The lower end of the shunt is
beveled and knurled,
so that it can be
grasped by the fingers and turned to change
the setting.
A
calibrated scale plate is
mounted adjacent to the shunt.
A groove just
above the knurl in the lower end of the shur,
serves as an index mark, and the relay pick­
up setting is indicated by the calibration
scale marking which is adjacent to the groove.
The construction of the pluncer,
core and
flux shunt (which differ in details in the
various types of these relays) causes the
plunger to float in its energized position,
EFFECTIVE JANUARY 1958
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om
TYPES SC. SCI. SV AND SV-1 RELAYS
_______________
TERM INA!-
Fig. 1.
O'i'ERCURIEIIT U N I T
TERMINAL
WHEN USED
TAP
I
I
I
I
I
RED KAMDI.E
T E S T SWifCit
CIRREHT TEST JACK
TERPtiUL
fRONT VIEW
Internal Wiring al the Relays In The Small Glass
Consequently,
the contacts
above
there is negligible
are free
even when
the pick-up
from
heavy overloads and in 25 cycle
value.
noise
chatter,
Fig. 2.
and
even on
applications.
182A854
Internal ScltemCJtic of the Single Unit Type SC or
SC-1 Relay In The Type FT21 Case.
of
the
coil
frame at the rear of the shunt.
This spr�ng .arm is shaped to extend around the
shunt
to
the
front of the relay,
and in its
normal position it exerts sufficient
lP
much
*
ar
being held against a stop,
energized
---CHAS S I S OPUAJED
SttOR T I Ihl SWITCII
NOTE: COIL TAPPED
Foa 1 TO 2S RATIO
lANGE
Case.
without
an
..... ___________ .......
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'
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ls
STATIONARY CONTACT
against the shunt to prevent any
pressure
creeping
the shunt or undesired change of setting.
provides
the high
pick-up in the
is above
latch
90%
.
operate
it is
rise
with
the latch
the stationary
their
energized,
In
necessary for
sufficient
positively
contacts
opening,
This ratio
setting.
due to play
is
in the latch.
It
istic,
in,
order to
obtain
and this lower ratio
to
de­
is
this character­
may be
desirable
is
required.
operated
.E
in some applications where the latch
The plunger floats in its
position just as in the SC and SV relays.
drop-out ratio varies somewhat for
shunt positions,
but is
not
The
different
constant for any
one
w
setrting.
ww
from
spring steel,
2
a
of
the spring arm has a bent-over
The
arm
out
position
stationary
threaded
are
curved
which is
arm
made
of sheet
fastened to the bottom
assembled on
filister-head screws which are
terminal
assembled
Lock-
inserts.
inside
the
moulded
bushings between the inserts and the
By
screws.
contact
the
rotating
mounting screw
bracket
on
--·-->----�-�----
and moving it along its
assembly
can
be-
normally open ()r n_ormally ��.<?sed_�
contacts
plate
is being
as a safeguard against loosening of the
base,
the
latter
These are held in position
the
into
are
washers
terminal
the
of
contacts
slotted brackets.
on the base by
to
of contact with the shunt
are mounted
·
its
slot�--
;ad�---eTIEer-
on a Micarta insulation
which is secured to the threaded end of
the plunger shaft by a nut.
The shunt is held in any desired position by
pressure
the
the
necessary to have a lower ratio of drop-out to
pick-up
move
changed.
and to deflect
the relay
end
while the
sufficiently to pre­
when
front
tab on which thumb-pressure may be applied
the
force
lec
vent
ratio of drop-out to
any pick-up
relays
to
construction
SC and SV relays.
for
type
p lunger
and plunger
ca
also
shunt·
tri
The core,
of
The
this insulation
The front edge of
plate operates the indicator.
The rear portion of the plate is slotted and a
post
screwed to the frame passes through this
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TYPES SC. SCl. SV AND SV-1 RELAYS.
66
L;....;..:: 4.:... 1·7
A
""-.1 '-..;;_
..,________;
·,.:...
________
I�TERIOAL SCHEMATIC
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ls
CONTACTS- EITtlER
MAKE OR iiREAK
ASREQUiii.EO
TEST SWITCK
CVrHACTSEITnER
1 MAl(£ 1 IIREAI(, OR
l MA�E OR l. iiREAK
ASii:EI/Uiii:EO
CURREJIT TEST JACK
TEiMIUL
TYPE OF UtiIT
� c
:�
aur
D.C.
,
A.C.
&
LEFT rt.UD
LOWER RATING HIGHER RATIK!l
SAME TYPE
s
E
IOTE: CO.ILS TAPP£D
FOR 1 TO 2S. RAJIO
IUJIGE
�
� !--+---"'"-'""'- 0�'-lKIGHT HA"O
_1_
D.C.
A.C.
Fig. 3.
lnte�nal Schematic of the Double Unit Type SC or
SC- 1 Relay in the Type FT21 Case.
slot to prevent the plate from rotating.
-------rr·-----···
can be__
__ _
makE)"-_or
"break"
· --�-
---
contacts
are pure silver.
-- --
-·
le a2Cs:All
by flexible
terminals
5 amperes continuously, and will inter­
at 115 volts A-C,
volts D-C.
125
or l
ampere
ca
5 amperes
rupt
at
The
and are connected to
-- · · - -
the base
carry
The mechanical operation indicators used
l'elays are shockproof,
to indicate on the up stroke
the
plunger.
out the
knurled
reset after
otherwise
is
may
be a one or two percent
indicator
.E
operation
factory to indicate
plunger,
but by
should
operation because
decrease in the operating value of the
The
reset by
stud which projects
The indicator
each relay
there
on
or down stroke of
indicator
lec
pulling
The
through the cover nut.
be
on
relay.
is assembled at the
the
removing
up stroke of the
the
two
which fasten th e indicator to the mair
frame,
turning
and at
the same
w
180°
the indicator
time swinging
about its
be set to
indicate
plunger.
The rivet
ww
Internal Schematic of the Single Unit Type SV or
turned around to complete the assembly.
from the indicator
shaft,
the indicator·
the indicator can
must be
flag and the
current
an extremely
certa�n styles of SC and SC-1
provided
with
wide
adjustment is desirable,
tapped
and
relays have been
coils to meet this re­
quirement.
The coil taps are brought out to a
tap
mounted
block
frame
pending
or
on
on
on the type
nector
pick-up
of case used.
is adjusted in the
s cal e
plate
pick-up
block is marked
setting
� c a le
between
taps.
The
for the relays
as there is not sufficient
space
for marking a scale for each tap.
ever,
the
that a customer
with
and the
usual manner· to ob­
is not calibrated
tapped coils,
de-
The con-
value of each tap,
shunt
tain any
lower end of the
relay sub-base,
plate on the tap
the minimum
"'ith
the
the
plate
may mark
How­
is supplied in ordc�
on it the individual
relay setting or settings if desired.
INSTALLATION
bracket around
on the down stroke of the
weight
In certain applications,
range of
mounting
screws
flag
FROIIT V I EW
SV-1 Relay in the Type FT2 1 Case.
relay
and can be used
tri
these
TERHIJ'IAI.
coutacts are double-faced so that they
lP
moving
Fig. 4.
ar
*
TEST SWI C
T h
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l82A855
an
'---'""'---"':::=::-':=:-=-*====::.-���!:::ao�;�6:a
RED HAHDLE
removed
latch screen
The relays should
panels or their
from
heat.
the
dirt,
be mounted on switchboard
equivalent in a location free
moisture, excessive vibration,
and
Mount the relay vertically by means of
four
mounting
holes
on the
flange for
3
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TYPES SC, SCI. SV AND SV-1 RELAYS
_____ ________ ___
IMTEIIIIAL SCHEMATIC
CO.UCIS • EITHER
OR IREU AS
IIE()UIRED
ua
ls
M.Ut
CONTACTS· EITHER
MAKE 0� Ofi:EAK
AS REQUIRED
TOP L.ll. ':'\o:r
(fliiQIT �liW)
TEST SIIIITCn
1.111 IT
Of
UNITS
Ill GilT HAIIO
1
D.C.
·-
i�
LEFT HAHD
l
LOWER RATIHII
UNIT
SAMf: TYPE
BUT D.C. 1 A.C.
111GHER A
UMIT
A.C.
182A857
Fig. 5.
Jlnternal Schematic of the Double Unit Type SV or
or by means
*
TEST SWITCii
CURREill
Fig. 6.
f[lf .6AU
TEIIMIML
183Al93
Internal Schematic of the Three Unit Type SC or
SC- 1 Relay in the Type FT32 Case.
of the rear
A contact burnisher S # l8 2A836HOl is recommended
lP
mounting
hOI! lNG SlltCil
ar
SV- 1 Relay in the Type FT21 Case.
semi-flush
CKASSIS OP£1AtED
IOJE: COJLS. TAPPED
FOil: l TO 2S U.JIO
LOCATIOfi OF EACH UK IT
tM
ARRAIIUEHEIIT
TYPI� OF
an
TERMINAL
FROIIT YIEW
mounting stud or studs for projection mounting.
for this purpose . The use of abrasive material
Either a mounting
for cleaning contacts is not recommended,
stud or the mounting screws
may be utilized for grounding the relay.
The
cause of the danger of embedding small
cles in the face of the soft
the
impairing the contact.
terminals
panel
ca
electrical connections may be made directly to
by means
mounting
of screws
for steel
studs
by locking
may
be easily removed or
tri
inserted
two nuts on the stud and
For detailed
lec
then turning the proper nut with a wrench.
r. L. lel-076.
Fr case
information
refer to
.E
adjustments
o peration of this relay
factory
have bee n
customer.
changed,
if
w
or
adjustments
at
it
c o r re ct
have been made at the
and should not be disturbed
ceipt by the
repairs,
to insure
If the
after
re­
adjustmertts
the relay taken apart �or
is
regular
ww
factors
the
of
ratio does
may
rel ay.
affect
so because
correct
ass e mb ly or
of the
tube, will
a l t er
However,
plunger
the
p a rt s,
or
in ­
Obviously,
interchange of
SC
drop-out
affects the
either the drop-out
pick-up or both are affected.
as the use
the
Whatever
such
with the SV CCJre
electrical
charact er ­
the factor most l ikely
encountered in service is friction.
�o
be
This may
be due to dirt or foreign material between the
plunger shaft
pressure
cator,
tend to
sand its bearings, to excessive
of the indicator screen on the indi­
or to leads
rotate
or
so
mis-shaped that
tilt
the moving
they
contact
insulation plate with appreciable force.
desired to check the
maintenance
periods,
the instructions below should be followed.
All contacts should be cleaned periodically.
4
Several
ratio
istics.
ADJUSTMENTS AND MAINTENANCE
The proper
parti­
and thus
or to the terminal studs fur­
nished with the relay for thick panel mounting.
The terminal
silver
be­
I� order to remove the plunger and shaft as­
sembly,
it is necessary to remove the setscrew
and nut at the top of the shaft.
The
spool-
CHP.RACTERISTICS
sc
sc
sc
sc
sc
sc
sc
sc
SC-1
SC-1
SC-1
S C-1
SC-1
SC-1
SC-1
SC-1
DC,
DC,
DC,
DC,
DC,
DC,
DC,
DC,
25
25
25
25
25
25
25
25
to
to
to
to
to
to
to
to
60
60
60
60
60
6o
60
60
DC,
DC,
DC,
DC,
DC,
DC,
DC,
DC,
25
25
25
25
25
25
25
25
to
to
to
to
to
to
to
to
60
60
60
60
60
60
60
60
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
c.
SC AND SC-1
RELAXS
Max. Amps.
Continuous
Watts
5 Amp'!.
60 Cycles
-V.A. at.
5 Amps.
60 Cycles
-5-2
1-4
2-8
4-16
10-40
20-80
40-160
4-100*
1.5
3
6
12
25
40
40
10-15-20
99
28
6.9
1.5
.24
.07
.03
1.7-0.6-0.18
225
65
19
5
-7
.16
.05
5-1-0.2
-5-2
1-4
2-8
4-16
10-40
20-80
40-160
4-100*
1.5
3
6
12
25
40
40
10-15-20
100
24
6
1.5
.25
.07
.03
1.7-0.6-0.18
210
60
16
5
.65
.16
.05
5-1-0.2
Dropout
Ratio-AC
Dropout
Ratio-De
90-98%
90-98%
90-98%
90-98%
90-98%
90-98%
90-98%
90-98%
65-80%
65-80%
65-80%
65-80%
65-80%
65-80%
65-80%
65-80%
35-60%
35-60%
35-60%
35-60%
35-60%
35-60%
35-60%
35-60%
2 5-40%
25-40%
25-40%
25-40%
25-40%
25-40%
25-40%
25-40%
ua
ls
Frequency
TYPES
an
Type
Range of
Adjustment
Amps.
OF
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om
I. L. 41-766.1 A
TYPES SC. SCl. SV AND SV-1 RELAYS
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* Coil has taps on which minimum pickups are 10 and 30 amperes.
sv
SV
SV - 1
SV-1
SV-1
SV-1
160
180
200
150
70-160
70-160
70-160
50-150
160
180
200
150
Watts at
115 V . AC
(125 v. for DC
3.4
2.8
1.5
4.8
4.1
3-5
1.4
4.8
V.A .
.at
115 v.
Dropout
Ratio
7-3
6.1
2 .5
90-98%
90-98%
90-98%
65-80%
8.5
7-l
3.2
40-80%
40-80%
40-80%
25-40%
lec
tri
60
50
25
DC
70-160
70-160
70-160
50-150
Max. Volts
Continuous
lP
60
50
25
DC
SV
SV
Range of
Adjustment
Volts
ca
Type
Frequency
(Cycles
ar
CHARACTERIST ICS OF SV AND SV-1 RELAYS
ww
w
.E
NOTES:--Standard current relays are calibrated on 60 cycles.
This calibration is approximately
correct for 25 cycle and DC applications, but there will be discrepancies of 10% to 15% at some
points on the scale.
Values of watts and volt-amperes in the tables are average for various plunger and shunt
position.
For tne SC relay, volt-amperes. for pickup at minimum setting are approximately 3.4 and 1.4
Watts at minimum setting are approximately 1.0, .65 and .57 for 60
for 60 and 25 cycles.
cycles, 25 cycles and DC respectively.
Multiply values by 16 for approximate burdens at maxi­
mum setting.
For the SC-1 relay, volt-amperes for pickup at minimum setting are approximately 3-5 and 1.3
for 60 and 25 cycles. Watts at minimum settings are 1.3, .7 and .57 for 60 cycles, 25 cycles
and d-e, respectively. Multiply values by 16 for approximate burdens at maximum setting.
*The V.A. burdens of the SC and SC-1 relays at 3, 10 and 20 times minimum pickup current are
approximately 31, 240 and 770 V.A. respectively.
Dropout ratio varies somewhat with pickup adjustment but will be approximately constant for
any given pickup setting. Limits in tables include variables such as friction and other
individual relay variations.
Maximum continuous voles given for the SV and SV-1 relays for A-C are for the relay set for
minimum pickup.
With the relaY set for maximum pickup the continuous voltage can be increased
10 to 20%.
5
-----
Curve 143285
r
INTERNA.l SCHEMATIC
�
.
-ft+.
3.
TOP LEFT liA�O UMI T
(FROtH �lEW)
1
'
'
'
IIOTTOH liMIT
I
"
·
I
I
.
I
'
an
TOP IWMH llANO LIMIT
(FRONT �lEW)
' •
I
.
SV-l Relay in the Type FT32 Case.
ca
assembled on the upper end of
the plunger shaft has a portion of its
center
section machined off so that the shaft is
this
point
and
can
and
ex-
prevented
rrom
bushing with a
tri
turning by gripping shaft
be
Fig. 8.
lP
Internal Schematic ol the Three Unit Type SV or
posed at
·
100 zoo
400
600
800
1000
Perunt of Pick-up Sellin'/on SC or SC-I Relay (60 Cycles)
100
150
zoo
250
300
Percent of Pick-upSetfinqon SVor sv-1 Relay andon S C
o r SCI Relay Used o n D.C.
ar
183Al9 2
bushing
·
j
I'
TEII.IWIAL
shaped
.
tM
TEST SWITCH
W
JL
=rrm
r
'
'
.
Fig. 7.
ij
,L}
'SV. SV-t,SCondSC-1 Relays onO.C.
H l1
. 11ax. or 11in.Settinq
I.
1:
j{
ft
2
I
!H
;
111'
z
�
f
�-··
,
rl
Tin II
I.
"11'11�
I,,1ri f ltlil�
�
SVond SV-1 Rei
on 60?;c es
?:J
UJ.�
t.o 1 � l', Max. Settin�
S C an d S�-1 R elays on 60 cycles
'f'!'!1inQllSettin
�· �K
11ox. Settm
ill i I
l;
w rlTI
!
Jlf(n. Setti'!j
.
I
,IJ]+ -t+
.
5 . :I,.
� #J. lilt lm�
� tJ
· t Ill i ! i : li1T M-!=�frt±
rt �1 11
UJ i1[jlliIi i I lj! ll!f iili ::jr
::I �l
+
ii 11 . 11 4
COIIUCT�i- EITHER
MAI(f OR BREAK AS
IE:QIJIRE[I
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/
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TYPES SC. SCI. SV AND SV·l RELAYS
Typical
Time Curves
lor the Types SC and SV
Relays (Using Flux Shunt lor Pick-up Adjustment.)
cleaned or polished with any abrasive material,
as the abrasive particles might become imbedd­
ed in the shaft and
cause
difficulty
The plunger shart and bearings
wiping
by
may be
them carefully with a clean, lint­
pair of longnose pliers while removing the set
less cloth.
screw and nut.
zene or some other cleaning solvent if
lower
on
split
beaTing
tube,
the
the
sleeve
will
the
upper
end of the shaft,
lec
fingers
Then by pressing down with the
be
which
forced
bearing
the
retains the lower
out of the threaded
will drop out freely,
and
upper split sleeve will be forced out far
.E
enough to permit grasping it for removal.
The
shaft and plunger assembly then can be removed.
The
shaft
and
plunger
assembly should be
handled carefully to avoid bending
the
shaft
or damaging the bearing surfaces.
The
shaft
w
should never be gripped on its
surface,
upper
bearing
below the spool-shaped bushing, when
sary.
Use
This
no
proper operation.
two
years.
ww
6
bearing
surfaces
should
not
be
It is recommended that
the
When replacing the lower bearing
and the split sleeves,
the shorter sleeve
( as­
sembled below the bearing ) should be pushed in
until it is flush with the end of the threaded
tube.
The mounting
cator
holes
in
the ope�ation indi-
screen ar.e slotted so that its position
moving contacts
shaft
since
prevent
shaft be cleaned at intervals of approximately
can be adjusted.
The
neces­
lubricant on the plunger shaft
this will eventually become gummy and
loosening the nut and set screw, as this would
surface.
may be moistened with ben­
or bearings when reassembling the relay,
almost certainly damage the
bearing
later.
cleaned
For
are
relays
in which the
not latched in the oper-
ated position, the screen should be so located
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TYPES sc. SCI. sv AND SV-1 BELAYS
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Outline & Drilling Plan for Single Unit Relays in
that
the
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enters
the
screen opening when the contacts barely touch.
For latch- type relays,
obtained
ar
located that
the screen should be so
good contact is still
when the relay is
The pressure
de-energized.
of the screen against the indicator may be ad­
N331622
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justed by bending the screen between its lower
end and
the large elongated hole.
This pres­
sure should be such that the indicator will be
any
further position to which
it is
ca
held at
moved after entering the screen opening.
appreciably,
and consequently the
The purpose
indicator
of
be
ex­
since the pick-up value,
tri
ceeded
adjustment should not
ratio, will be affected.
this pressure is to eliminate
rattle which might otherwise
occur
lec
under certain energized conditions.
The moving contact
the terminal
clips
base terminals.
their
Although
their
moving contact leads are very
the
if the leads have been pulled out of
flexible,
shape
original
bearing
post
or
twisting
to cause
force
long period
or the dropout
In extreme
ratio notice­
cases the wear may progress
of
to a degree which may occasionally cause fail­
ure of the plunger to drop down when the relay
These sleeves
the shanks
ably.
guide
the resulting wear may affect the re­
lay calibration
in­
the
are notched at
is de-energized.
the notches are toward
the center of the relay .
The
leads
are bent
Correct shaping
of
cult, and
out through
moving the guide post
notches,
which aids in pre­
they
the leads is not diffi­
may be checked readily by re­
and
the nut at the top
of the shaft.
stationary contact brackets.
the raised position, either by energizing
ww
venting them from coming into contact with the
properly
leads.
coiled
may
shaft
appreciable friction and wear.
at approximately a right angle where they pass
w
against
If this condition continues for a
pass through
they
which are attached to the
upper ends, and
the
by handling
side pressure on the
exert sufficient
of time,
sleeves assembled on
.E
sulation
leads
View of" Type SC Relay Showing Correct Shaping
of Moving Contact Leads.
How
ever, the minimum amount of pressure necessary
to obtain this
Fig. 1 0.
Figure
ll shows
and assembled moving contact
The
plunger should be
relay or by pressing lightly
lar under
the
held in
the
against the col­
insulation plate after raising
7
plunger
raised,
manually.
With the
plunger
the insulation plate should be oscil­
and the
top
should be
lated slightly in a horizontal plane by twist­
5oth
ing it horizontally and releasing it.
when the
several trials the
plate
comes to rest
in
with
line of the contacts approximately
parallel to
the
base
and with its
hole fairly
well centered with the end of the
shaft,, if the plate does not tip
and if the leads have
-stationary contact
mounting
appreciably,
that
re-shaping
the
leads.
necessary t.o re-coil the leads,
around
a
rod
approximately 5/32".
stretched out
just
is
sharply
having
If
it
is
they should be
a
diameter
of
The coils then should be
enough to avoid side pull
or twi.sting force on the plunger assembly.
when the contacts
the relay
stationary contacts are assembled
they close when
they
should
touch the
5/32"
be
specified for
moving contacts
while the
located
the
should
so that they barely
de-energized position.
can be held in this
The
positi.on
the
shaft collar
lec
tri
between
.E
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The
adjustments
Failure to
observe them
operation,
a period of
service.
may
cause
either directly or
Contact position
not be used as a means of altering the
ratio of dropout to pickup.
RENEWAL PARTS
so
adjustment i.s being made by insert­
i.ng a 5/3 2" spacer
markings.
the stationary contacts are im­
improper relay
after
position
the relay is energized,
moving contacts when the latter are
above
are used in this
may operate at values a few percent
below the scale
lP
the
that
8
On some relays it may be found that
position.
portant:
de-energized
are l/32" above the
In all relays except the SV-1 relay for A-C,
ca
if
that they are closed when the re­
ar
wound
reversed so
the stationary contacts are
the moving contacts when
pairs of tweezers are convenient
re-shaping
When
stationary
but this should not ex­
they should be located so
it may be possible to obtain suffi­
two
l/32".
there should
the
that they just touch
where they emerge from the insulation sleeves.
or
stop springs,
of
time
leads are
the
cient correction by bending the leads
One
ceed
A-C.
When the plunger
ls moved upward against its stop,
be a slight deflection
contact
dimension
for
lay is de-energized,
brackets,
shows
relay
should touch at the same
plunger ls raised.
the latter
this check
tools for
contacts
This
SV-1
an
If
t�e core.
on the
a safe clearance to the
properly shaped.
necessary,
of
3/16"
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the center
If
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_______________
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TYPES SC. SCI. SV AND SV-1 RELAYS
Repair work can be dcne most
at the
factory.
parts can be
are
equipped
However,
furnished to
for
satisfactorily
interchangeable
the customers
doing repair
work.
who
When
ordering parts, always give the complete name­
plate data.
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TYPES SC. SCl. SV AND SV-1 RELAYS.
___ __________
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Outline & Drilling P l an for Single & D ouble Un i t Relays in the Type F T2 1 Case.
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TYPES SC. SCI. SV AND SV-1 RELAYS
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TERMINAL AND
MOUNTING DETPIILS
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PANEL DR.ILL\N� oR
CUTOUT �PROJE:CTION M"TGr.•­
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Outline & Drilling P l an for Three Unit R elays in the Type FT32 Case.
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W E S T I N G H OU S E
R ELAY- I N ST R U M E N T
ELECTR I C
D IVI S I O N
COR POR A T ION
N EWA R K , N . J.
Printed in U.S.A.
OPERATION
•
I.L. 4 1 -766. 1 G
MAINTENANCE
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INSTALLATION
Westinghouse
•
INSTRUCTIONS
CAU TION
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TYPES SC, SCI, SV AND SV-1 RELAYS
Before putting p ro tective relays into
be aring for the plunger shaft, i s assembled in the
service , remove all blocking which may have been
inserted for the purpo se of securing the p arts during
lower end o f this threaded tube . It i s held in place
by two split sp ring sleeve s , one abo ve and one belo w
shipment, make sure that all moving p arts ope r ate
freely, inspect the contacts to see that they are clean
to insert them in the tube and they will remain at any
p o s ition in which they are placed . The bearin g for
*
A P PLI C A T ION
the uppe r e nd of the plunger shaft is a Fluoro s int ®
an
and close properly, and operate the relay to check
the settings and electrical connecti o n s .
the bearing. The split sleeve s must be compre s sed
bushing which is pres sed in t he upper e nd of the
core . T hi s bearing is visible w he n t he plunge r is in
the e nergized positi on . The plunger itself does not
tM
The types SC and SC -1 current rel ays and the
types SV and SV- 1 voltage relay s are applicable w here
an instantaneous plunger relay o f high accuracy i s
required. The se rel ays are suitable for protective ser­
A flu x shunt which surrounds the core i s scre we d
on the tube, and its lower end projects below the re­
lay frame. The p osition of this shunt determine s the
pick-up setting of the relay . The lower end of the
shunt is beveled and knurled, so that it can be grasped
ar
vice, and for au xiliary service where some of their
touch t he w alls of the tube in w hic h .it move s .
special fe ature s are desired. They are adjustable over
a wide range of voltage or current, are p rovided with
lP
mechanical operation indicator s , and have a calibra­
ted scale which indicate s the pick-up setting. Both
contacts can readily be changed from "make " to
ca
" break " . The volt- ampere burden i s lo w .
The type S C an d S V rel ays have a high ratio o f
tri
drop-out t o pick-up ( 9 0 t o 98%) and are p articularly
suitable for fault detector relay s . The ty pe SC- 1 and
SV- 1 relays have a lower ratio of drop-out to pick-u p .
T h i s lower ratio m ay be de sirable in some applicatio n s ,
and it make s p o s sible a plunger p ull characteristic
lec
which permits the operation of a latching device. The
latch is combine d with the mechanical operation indi­
cator, and p revents further motion o f the moving con­
tacts after the relay has operated.
CON S T R UC T ION
by the fingers and turned to change the setting. A
calibrated scale plate is m ounted adjacent to the
shunt. A gro o ve just above the k nurl in the lowe r end
of the shunt serve s as an index m ark, and the relay
pick-up setting i s i ndicated by the calibration scale
m arking w hich i s adjacent to the groove.
The construction o f the plunge r , core and flu x
s hunt ( which differ i n details in the v arious types o f
the se relays) cau se s the plunger t o float i n i t s ener­
gized p o sitio n , without being held against a sto p ,
even when energized much above the pick-up value.
Consequently, there is negligible noise and the con­
tacts are free fro m chatte r , even on heavy ove rloads
and in 2 5 cycle applicatio n s .
The core , shunt an d plunger con struction al so
ate on the solenoid principle. A U- shaped iron frame ,
pick-up setting. In the latch type relay s it is nece s sary
.E
The type s SC , SC- 1 and SV and SV- 1 relays oper­
provides the high ratio of drop-out to pickup in the
SC and SV rel ay s . This ratio is above 90% for any
for the plun ger to rise with sufficient force to ope r­
serve s as the external magnetic p ath for the coil. The
ate the latch p o sitively and to deflect the stationary
coil surrounds a core and flu x shunt. The upper e nd
contacts su fficiently to prevent their openi n g , whe n
of the core is threaded and projects thro ugh the uppe r
* side o f the frame , to w hic h i t i s fastened by a nut . A
It is nece s s ary to have a lower ratio o f drop-out to
w
mounted on the moulded base, suppo rts the coil and
tube t hre aded
on
the outside at its lower e nd i s assem­
bled in the core , and t he thre aded e nd e xte nd s be low
ww
t he core . A Fluorosint® bushing , which i s the lower
@ The P olymer Corp .
SUPE RSEDES I.L . 4 1 -766.1F
*Denotes change from superseded issue.
the relay is de-energized, due to play in the latch.
pick-up in, order to obtain thi s characteristic, and
this lower ratio m ay be de sirable in some applica­
tions where the latch is not required. The plunger
EFFEC TIVE FEB RUA RY 1 973
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________________________
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TY P ES SC, SC- 1 , SV AN D SV- 1 R EL A Y S
O'IERCUUUT UIIIT
COMTACTS EITilEil
l �AI(f l iREAK, Oil:
!s"::�u�:E� �
REOHAPIOLE
TEST SWITCH
CLWRENT TEST.JACI(
an
TERI'41U.L
--�--CHASSIS OPERATED
Shi)IH114� SWtTC"
MOTE: COIL TAPPED
FOR 1 TO 2� RATIO
URGE
87176 6
1.
I n ternal Wiring of th e R elays In The Small G l as s
Fig. 2.
I nternal S ch ematic of the Single U n i t Type SC or
tM
Fig.
182A854
SC-1 Relay in Th e Type FT2 1 Case.
Case.
floats in its operated po sition j u st as in the SC and
SV relay s . The drop-out r atio v aries somewhat for
base terminals by flexible l ead s . All contacts are
pure silver. The contacts will carry 5 amp e r e s con­
ar
different shunt position s , but is constant for any one
setting.
The moving contacts are double-faced so that they
can be "make" or " break" and are connected to the
The shunt is held in any d e si red po sition by p r e s­
tinuously, and will interrupt 5 amp eres at 1 1 5 volts
A-C , or 1 amp ere at 1 25 volts D-C .
lP
sure from a curved arm made of sheet spring steel ,
which is fasten ed to the bottom of the coil frame at
the rear of th e shunt. This spring arm is shap ed to
T h e m e chanical op eration indic ator s u se d on
the se relays are shockproof, and can be u s e d to in­
dicate on th e up strok e or down stroke of the plunger.
against the shunt to p r e v ent any creeping of the shunt
or unde sired chan g e of s etting. The front end of the
which p roj ects through the cover nut. The indicator
should be r e set after e ac h relay operation b ec au s e
spring arm has a bent-over tab on which thumb-pressure
m ay b e applied to move the arm out of contact with
the s hunt while the position of the latter is b eing
oth erwis e there may be a o n e or two p ercent decrease
changed.
up strok e of th e plunger, but by removing the two
mounting screws which fasten the indicator to the
lec
tri
ca
extend around the shunt to the front of th e rel ay, and
in its normal position it exerts suffici ent p r e s sure
The indicator is r eset by pulling out the knurl ed stud
in the op erating v al u e of the relay. The operation in­
dicator is as s embled at th e factory to indicate on the
The stationary contacts are ass embled on slotted
brack ets. The s e ar e held in position on the base by
main fram e , turning the indicator brack et around and
at the s am e tim e swinging the indicator flag 1 80°
minal ins erts. Lock - w ashers are as sembled inside th e
on t h e down strok e o f th e plunger . The rivet weight
moulded terminal bushings betw een the ins erts and
m u st b e removed from the indicator flag an d the l atch
the base, as a safeguard against loo sening of the
screen turned around to complete the assembly.
.E
filister- head screws which are threaded into the ter­
about it s shaft, the indicator can be s et to indicat e
screws. By rotating the bracket on its mounting screw
and moving it along its slot, the contact assembly can
In certain applications, an extrem ely wide range
be m ade either normally open o r normally closed. The
of current adj u stment is d esirable, and certain styl e s
moving contacts are mounted on a Micarta insulation
o f S C and SC- 1 relay s have b e e n provided with tapp ed
coils to meet thi s requirement. The coil t ap s are brought
ger shaft by a nut. The front edge of this insulation
out to a tap block mounted on th e lower end of the re­
w
p l ate which is secured to the threaded end of the p lun­
l ay frame or on the relay sub -base, depending on the
typ e of case u sed. The conne ctor plate o n the tap
through this slot to prevent t h e plate from rotatin g.
block is mark ed with the minimum pick- up v al u e of
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plate operate s the indicator. The rear portion of the
plate is slotted and a post screwed to the frame p as s e s
2
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TY P E S SC, SC- 1 , SV AN D SV- 1 R ELAY S
•.:.
· L.:...... . _. 41 .:...7· �6. .:...6-_. lG::....
_____________________
I MT£RNAL SCH£MAT I C
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A E l DR[Af\, OR
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CUR REliT TEST JACII.
AS PI.E!JU I�EO
IIOJE: COiLS
FOR 1 TO 25
RAIIGE
TAPH.O
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Fig. 3.
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fRONT VIEW
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Internal S c h emat i c o f th e Double Unit Type SC or
SC- 1 R elay in th e Typ e FT2 1 Case.
Fig. 4.
Internal S c h emat i c o f t h e Single Unit Type S V o r
S V - 1 R elay in t h e Type FT2 1 Case.
shoul d not be di sturbed afte r receipt by the cu stome r.
I f the adj ustments h ave been changed, the rel ay take n
ped coil s , as there is not sufficient space for m arki n g
a s cale for each tap. H o we ver, the s c ale plate i s sup­
j u stments at re gular m ai nten a n ce perio d s ,
stru ctio n s bel o w should be fo llowed.
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each tap , and the shunt is adj u sted in the u s u al m an­
ner to obtain any pick-up setting between tap s . The
scale pl ate i s not c alibrated fo r the relays with tap­
ca
plied in order that a cu stomer m ay m ark on it the in­
dividual rel ay settin g or settings if de sired.
I N S T ALLAT ION
The relays shoul d be m o u nted on switchboard
panel s or their e quivalent i n a l o cation free from dirt,
lec
tri
moi sture, e xce s sive vibratio n , and heat. Mount the
rel ay vertically by me ans of the fou r mounting hol e s
on the fl ange f o r sem i- flush mounting or b y me ans o f
the rear m o unting stud or s t u d s for p roje ctio n m o u nt­
ing. Either a m o unting stud or the mounting s cre w s
m ay be util ized f o r grounding the relay. The electri­
.E
cal c o nne cti o n s m ay be m ade directly to the termi n al s
b y me ans o f scre w s fo r steel p anel m o u nting o r t o the
term i n al studs furni shed with the rel ay for thick p anel
mo unting. The term i n al studs m ay be e asily rem o ved
or i n serted by l o c k i n g two nuts on the stud and then
turni n g the prope r nut with a wre n c h .
ww
w
For detailed FT c ase i nform ation refer t o I . L .
41-07 6 .
ADJUSTM ENTS
AN D
M AI NTENANC E
The proper adj u s tments to i nsure correct opera­
tion of thi s rel ay have bee n m ade at the factory and
apart for repai r s , or i f it i s de sired to check the ad­
the i n­
All co ntacts should be cleaned pe ri o d i c ally. A
contact burnisher Slt l8 2A836H 0 1 i s recommended for
thi s purp o se . The u se o f abrasive m aterial for clean­
ing c o nt acts is not recommended, because o f the dan­
ger o f em be dding sm all p articl e s in the face o f the
soft sil ve r and thus im p ai ring the contact.
Se veral factors m ay affect the drop-out ratio o f
the relay. Whatever affects the ratio does so because
either the drop-out or p ick-up or both are affe cted.
Obviously , inco rre c t as sem bly or interc hange o f p arts ,
such as the u se of the SC plunger with the SV core
tube , will alter the ele ctric al char acteri stics. H o we ve r ,
the factor m o st likely t o be encountere d i n se rvice i s
frictio n . T h i s m ay be due t o dirt o r foreign m ater i al
between the plunger shaft and its bearin g s , to e x­
ce ss ive p re s sure of the i nd i c ator scree n on the i ndi­
cator, or to leads so m i s- shaped that they tend to
rot ate or tilt the m o v i n g co ntact i n sul ati o n pl ate
with appreci able force .
I n o rder t o rem o ve the pl u n ge r a n d shaft assem bly ,
it i s nece ssary to rem o ve the setscrew and nut at the
top of the shaft. The spool - s h aped bushing assem bled
o n the upper end of the plu n ge r shaft has a port io n of
3
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l'Y P E S SC, SC- 1 , SV AN D SV- 1 R ELAYS
-------
IITEIIIIAL SCIIEIT
IA IC
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NUl: 011 NEAl AS
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COtiTACTS- EITHER
IU.I(EORIIIEU
AS REQUIIIED
�---T-II
---T- I..tHT nAIID UNIT
(FRONT �lEW)
TOP L.h. '.'\..T
(IIOIIT Haf)
TEST SWITCrl
TERNIMAL
SAME TYPE
BUT D.C. l A.C.
an
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"" TS
IOJE:. COILS. TAPI'ED
fot 1 TO 2& IATIO
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I"'GH�,·��
IT
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LOCATIOtl OF EACrl UNIT
RIGIIT nAND
LEFT K,._D
O
I.. IER RUIIIIi
Uiiu
o.c.
A.C.
182A857
I n ternal Schematic of th e Double Unit Type S V or
S V- 1 R e l ay in th e Type FT32 Case.
Fig. 6.
CHASJIS QII£1A 1U
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183Al93
I n ternal Schemati c of the Three U n i t Type SC o r
SC- 1 R el ay i n the Type F T32 Case.
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Fig. 5.
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' 'T Of
ARRAM'EME
TYPE OF UNIT
FROIIT YllW
ed at intervals of approximately two years. When re­
ing by gripping shaft and bushing with a p air of long­
nose pliers while removing the set screw and nut .
placing the lower bearing and the split sleeve s , the
s horter sleeve ( as sembled below the bearing) s hould
be pushed in until it is flus h with the end of the
Then by pressing down with the fingers on the upper
threaded tube.
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its center section machined off so that the shaft is
exposed at thi s point and can be prevented from turn­
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end of the shaft, the lower split sleeve which retain s
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the lower bearin g will be. forced out o f the threaded
tube, the bearin g will drop out freely , and the upper
split sleeve will be forced out far enough to permit
grasping it for removal. The shaft and plunger as­
sembly then can be removed.
The mounting holes in the operation indicator
screen are slotted so that its position c an be adj u sted.
For rel ay s in which the moving contacts are not l atch­
ed i n the operated position , the screen should be so
loc ated that the indic ator positively enters the
screen opening when the contacts barely touch. For
latch-type rel ay s , the screen should be so located
led carefully to avoid bending the s haft or damaging
the bearing surface s . The shaft should never be grip­
that good contact is still obtained when the relay i s
de-energized. The pressure o f the screen against the
ped on its upper bearing surface, below the spool­
indicator may be adjusted by bending the screen be­
lec
The shaft and plunger as sembly should be hand­
tween its lower end and the large elongated hole.
as this would almost certainly damage the bearing
This pressure should be such that the indicator will
s urface. The s haft bearin g surfaces s hould not be
be held at any further position to which it i s moved
cleaned or polished with any abrasive material, as
after entering the screen opening. However, the m i ni­
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shaped bushing, when loosening the nut and setscrew,
the abrasive p articles might become imbedded in the
mum amount of pressure necessary to obtain this ad­
s haft and cause difficulty later. The plunger shaft
j ustment should not be ex ceeded appreciably, since
the pick-up value, and consequently the ratio, will
be affected. The purpose of this pres sure is to elim­
tened with benzene or some other cleaning solvent if
inate indicator rattle which might otherwise occur
under certain energized conditions .
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and bearings may be cleaned by wiping them c are­
fully with a clean , lint-less cloth. This may be mois­
necessary. U se no lubricant on the plunger shaft or
bearin gs when re-as sembling the relay, s ince this
T h e moving contact lead s p a s s through insulation
operation. It is recommended that the shaft be clean-
sleeves assembled on the shan k s of the termin al cli p s
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will eventually become gummy and prevent proper
4
C HARACTERISTICS OF TYPES SC AN D SC- 1 REL AYS
Frequ ency
sc
sc
sc
sc
sc
sc
sc
sc
DC ,
DC ,
DC ,
DC ,
DC ,
DC,
DC ,
DC ,
DC,
DC ,
DC ,
DC,
DC ,
DC ,
DC ,
DC,
SC- 1
SC- 1
SC -1
SC- 1
SC- 1
SC -1
SC- 1
SC- 1
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
25 to
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
. 5- 2
1-4
2- 8
4 -1 6
1 0 -40
20- 80
40- 1 60
4- 1 00 *
. 5- 2
1 -4
2- 8
4- 1 6
1 0 -40
20 -80
40- 1 6 0
4 -1 0 0 *
hz.
hz .
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
h z.
hz.
hz.
1. 5
3
6
1 2
25
40
40
1 0 - 1 5- 2 0
1. 5
3
6
12
2 5
40
40
1 0- 1 5- 2 0
Watts
5 Amp s .
60 Cycl es
V . A. at
5 Amp s .
6 0 Cycl e s
99
28
6.9
1.5
.24
. 07
.03
1 . 7 -0 . 6- 0 . 1 8
100
24
6
1. 5
.2 5
. 07
. 03
1 . 7-0 . 6- 0 . 1 8
2 25
6 5
19
5
.7
. 16
.0 5
5- 1 - 0 . 2
210
60
16
5
.6 5
. 16
.05
5- 1 -0 . 2
Dropout
Ratio- AC
Dropout
Rati o- De
90-9 8%
9 0- 9 8%
9 0- 9 8%
9 0- 9 8%
90-9 8%
9 0- 9 8%
9 0- 9 8%
90-9 8%
3 5- 60%
3 5- 60%
3 5-60%
3 5- 60%
3 5- 6 0%
3 5-6 0%
3 5- 6 0%
3 5- 6 0%
6 5- 80%
6 5- 80%
65- 80%
6 5- 80%
6 5- 80%
65- 80%
6 5- 80%
6 5- 80%
25- 40%
25- 40%
2 5- 40%
2 5- 40%
25-4 0%
25 -40%
2 5- 40%
25- 40%
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Range of
Adj u stment M ax . Amp s .
Amp s .
Conti nuou s
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Typ e
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I.L. 41-766.1G
TYP E S SC, SC- 1 , SV A N D SV- 1 R EL AY S
* Coi l has tap s on w hi ch mi ni mum pi ckup s ar e 1 0 and 30 amp e r e s .
60
60
60
60
50
25
DC
DC
7- 1 6
70- 1 6 0
1 40- 3 2 0
280 -6 40
7 0- 1 6 0
7 0- 1 6 0
50- 1 50
100- 300
16
160
320
640
1 80
200
1 50
3 00
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7 -1 6
7 0- 1 6 0
1 40- 3 20
280 -6 40
70- 1 60
7 0- 1 60
50- 1 50
1 00 -3 0 0
Watts at
1 1 5 V . AC
( 1 2 5 V . for D C )
16
1 60
320
640
1 80
200
1 50
300
V.A. at
1 1 5 v.
3.4
7.3
2. 8
1. 5
4. 8
6. 1
2. 5
4.1
8. 5
3. 5
1.4
4. 8
7.1
3. 2
Dropout
Ratio
9 0 -9 8%
90-9 8%
90-9 8%
90-9 8%
90-9 8%
90-9 8%
6 5- 80%
6 5- 80%
40- 80%
40- 80%
40 -80%
40- 80%
40- 80%
40- 80%
25-40%
2 5- 40%
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SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
60
60
60
60
50
2 5
DC
DC
M ax . Volts
Conti nuou s
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sv
sv
sv
sv
sv
sv
sv
sv
sv:1
Range of
A dj u s tm ent
Vol t s
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Typ e
Frequ ency
( Cycl e s )
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C HARACTERISTICS OF SV AN D SV- 1 REL AYS
N OTES:- -Standard current relays are calibrated on 6 0 cycl e s . Thi s cali bration i s approximately correc t
for 25 cycle and D C appli cations, but there wi ll be di screpanci e s o f 1 0 % to 1 5% at some points o f s c al0.
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V al u e s of watts and volt- amp eres i n the table s are average for various plunger and shunt positi o n .
For t h e S C relay , volt- amp e r e s for pi ckup at mini m u m s etti n g are app roxi mately 3 . 4 and 1 . 4 for 6 0
and 25 cycles. Watts at mini mu m s etti ng are approxi mately 1 . 0 , . 6 5 and . 57 for 6 0 cycle s , 2 5 cycles and
DC respecti v ely. M ulti ply val u e s by 16 for approximate burd ens at maxi mum setting.
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For the SC- 1 r el ay, volt- amperes for pi ckup at mi ni m u m s etti n g are approximately 3 . 5 and 1 . 3 for 60
and 25 cycl e s . Watts at mi ni mu m s etti ngs are 1 . 3 , . 7 and . 57 for 6 0 cycl es,
25 cycl e s and d- e respecti vely
M ulti ply val u e s by 16 for approxi m ate burdens at m axi mum setti n g .
*The V . A . burdens o f the S C and SC -1 rel ay s at 3 , 1 0 and 20 ti m e s mi nimum pi ckup current a r e approx­
i m ately 3 1, 240 and 7 70 V . A. respecti vel y .
Dropout ratio vari e s some what wi th pi ck up adj u stment b u t wi ll be approxi m ately constant for any
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gi ven pi ckup s etti ng. Li mi t s i n tables i nclude vari ables s u c h as fri ction and other i ndi vi dual relay vari a­
tions.
M axi mum conti nuous volts gi ven for the SV and SV- 1 relay s for A-C are for the relay s et for mi ni m u m
pi ckup . Wi th t h e relay s e t for m axi m u m pi ckup t h e conti nuou s voltage c an be i ncreased 1 0 to 20%.
5
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TY P E S SC, SC- 1 , SV AN D SV- 1 R ELAYS
----
Curve 1432 85
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I" TERU.l SCHEHATIC
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IIEQIJ IREU
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TOP LEFT tiAII O Uit i T
( FRONT �� Elt)
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IOTTOt4 U it i T
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TEST S�ITCII
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TEII:WUIAL
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F i g. 8.
Typ i cal Time Curves fo r th e Typ e s SC and S V
R el ay s ( U s i n g Fiux Sh u n t for Pick -up A dj u stment.)
These
collar under the insulation plate after rai sing the
sleeves are notched at their upper end s , and the not­
plunger m anually. With the plunger rai sed, the insul­
ches are toward th e center of the relay. The leads are
bent at approximately a right angle where they pass
out through the notche s , which aid s in preventing them
from corning into contact with the stationary contact
ation plate sheuld be oscillated slightly in a horizon­
tal plane by twisting it horizontally and releasing it.
If in s everal trial s the plate comes to rest with the
c enter line of the contacts approximately p arallel to
brackets. Figure 1 1 s how s properly coiled and ass em­
bled moving contact l eads .
the base and with its mounting hole fairly well center­
ed with the �nd of the shaft, if the plate doe s not tip
Although the moving contact lead s are v ery flexi­
appreciably , and if the leads h ave a safe clearance to
the stationary contact brackets, the 1 e ad s are properly
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which are attached to the base terminal s .
-
!00 zoo
400
600
800
1000
Ptrctnt of Pick·up Settin'l on SC or SC-I Relay (60 Cycles)
!00
150
zoo
250
300
Percent of Pick-up Setlinr; on SVor sv-1 Relay and on SC
or SC I Relay Used on D.C.
I n te rn al Schemati c of th e Three U n i t Type S V o r
SV-1 Relay i n the Type F T32 Case.
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-
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�- lli�Vand SV-1 l'�s on cr,c es
N
ox.
St'tlin
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SC and SC-1 Relays on60 cycltJ
in Settin
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-1 rrri I lfax. Settm
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TOP 11 J illl f ii411D UM I T
(FROtH �lEW)
183Al92
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' S V. S V-t,SC ond SC-1 Relays on D.C.
_ lfax. or lfin. Settinq _
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COITACT:i - EI TNER
MAICE OR IIIE.U AS
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ble, if the leads have been pulled out of their original
shape by handling they may exert sufficient sid e pres­
sure on the shaft bearing or twisting forc e against
shap ed.
If this check sho w s that re-shaping is n e c e s s ary,
it may be possible to obtain sufficient correction by
If thi s condition continu e s for a long p eriod of tim e ,
bending the leads sharply where they em erge from the
t h e resu ltin g wear may affect t h e relay calibration or
i n sulation sleeves. One or two p airs of tweezers ate
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the guide post to cau s e appreciable friction and wear.
or the dropout ratio noticeably. I n extreme case s the
tools for re- shaping the leads. If it is necessary to
wear may progress to a d egree which m ay occasionally
re-coil th e leads, they should be wound around a rod
c ause failure of th e plunger to drop down wh en th e re­
having a diameter of approximately 5 / 3 2" . The coi l s
lay is de- energized.
t h e n should b e stretched o u t just enough to avoid s i d e
pull o r twisting force on t h e plunger assembly.
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Correct shaping of the l eads i s not difficult, and
In all relays except the SV- 1 relay for A-C , if the
post and the nut at the top of the shaft. The plunger
stationary contacts are ass embled so that they clos e
should be held in the rai sed po sition , either by ener­
when the relay i s energized, they should b e located
gizing the relay or by pressing lightly against th e
so that they barely touch th e moving contacts when
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they m ay be checked readily by removing the guide
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I.L. 41-766. 1G
----
77-D- 418
O u tl ine & D ri lling P l an fo r Single U n i t R el ay s in
Small G l a s s Projection Case.
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Fig. 9.
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TY P E S SC, SC- 1 , SV AN D SV- 1 R E L AY S
the l atter are 5/ 3 2 " above the de-en ergized po sition .
The moving contact s can b e held in this p o sition
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whil e th e adj ustment i s being made by inserting a
5 / 3 2 " spacer between th e shaft coll ar and th e top o f
the core. This dimension should be 3/ 1 6 " o n the sv1 rel ay for A-C . Both contacts should touch at th e
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s am e time when th e plunger is raised. Wh en the plun­
is moved upward against its stop , there should be a
slight deflection of the stationary contact stop springs,
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but this should not ex ceed 1 / 3 2 ' '. When the stationary
contacts are reversed so that they are closed when
the relay i s de -en ergized, they should be l ocated so
that they j ust touch th e moving contacts when the
Fig. 10.
V i e w of Typ e SC R el ay Showing Correct Shap i n g
o f Movin g Contact L eads.
mean s of altering the ratio of dro p o ut to pickup.
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latter are 1 / 3 2 " above the de-energized position. On
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some relays it may be found that when th e contacts
are used in this position the relay may op erate at
values a few p ercent below the scale markings. The
adj ustments specified for th e stationary contacts are
important. Failure to o b s erve them may c au s e improper
P A RTS
Repair work can b e done m o s t satisfactorily at the
factory. However, interchangeable p arts can b e fur­
nished to the customers who are equipped for doing
repair work . When ordering p art s , alw ays give the com­
plete nameplate data.
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relay o peration, either directly o r after a p eriod of
service. Contact p osition should not be used as a
R E N EWAL
7
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TY P ES SC, SC- 1 , SV AN D SV- 1 R E L A Y S
_
_
_
_
_
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_
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INTERNAL SCHEMATI C
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Internal Schematic for R elays in Front Connected
Case.
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Outline and Dril ling P lan for R e lays in Front Connected Case.
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O ut line and Drilling P lan for S i n gle and Double Unit R e lays i n the Type FT2 1 Case.
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O ut l i n e and D r i l l i n g P l a n for T h ree Unit R elays in the Type F T32 Case.
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W E S T I N G H OU S E
R E LAY- I N ST R U M E N T
ELECTR I C
D IV I S I O N
COR POR A T ION
N EWA R K , N . J .
Printed in U.S.A.
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OPER ATION
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MA I N TEN A N CE
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I N S T A L L A TI O N
Westingho use I . L. 4 1 -766. 1 H
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TYPES SC. SC-1. SV AND SV-1 RELAYS
B efore putting protective relays into
coil surrounds a core and flux shunt. The upp er end
service, remove all blocking whi c h m ay hav e been
of the core i s threaded and proj ects through the upper
side o f the frame , to w hich it i s fa st ened by a nut . A
CAU TION
inserted for the purpose o f securing the parts during
tube threaded
shipment, make sure that all moving p arts operate
freely, inspect the contacts to see that they are clean
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the outside at its lower e nd i s assem­
bled in the c ore , and t he thre aded e nd e x tends below
the core . A Fluoros int® bushi n g , w hi c h i s the lower
types SV and SV- 1 voltage relays are applicabl e where
an
and close properly, and operate the relay to check
an instantaneou s plunger relay o f high accuracy i s
to insert them in the tube and they will remain at any
required. The se relays are suitable for protective ser­
position in which they are placed. The b eari n g for
the settings and ele ctrical connecti o n s .
bearing for the plunger shaft, i s ass embled in the
A P PL I C A T ION
lower end of this threaded tube. It i s held in plac e
by two split sp ring sleeves, one abo ve and o n e below
The types SC and SC- 1 current rel ays and the
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the bearing. The split sleeve s must be compressed
the upper end o f the plunger shaft is a Fluoros int ®
vice, and for au xiliary service where some of their
sp ecial feature s are desired. They ar e adjustable over
a wide range o f voltage or current, are p ro vided with
bushing which i s pres sed in t he upper end of the
ar
core. This bearing i s visible w hen the plunge r i s in
mechanical op eration indicator s , and have a c al i bra­
the e nergized positi on. The pl unger itself does not
ted scale which indicates the pick up setting. Both
contacts can readily be changed from "make " to
touch the walls of the tube in w hi c h it moves .
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A flux shunt which surrounds the core i s screwed
on the tube , and its lower end proj ects below the re­
lay frame. The position of this shunt determines the
p ick-up setting o f the relay . The lower end of the
shunt i s beveled and k nurled, so that it can be grasp ed
by the fingers and turned to c hange the setting. A
" break " . The volt- ampere burden is l o w .
0
ca
SC, SC- 1 , SV a n d SV- 1
The SC and SV relays have a high ratio of dropout
to pickup
(90
to
98%
for the ac relays). The SC-1 and
SV-1 have a lower ratio of dropout to pickup
(35
to
calibrated scale plate i s mounted adj acent to the
60%
shunt. A groove just above the k nurl in the lower end
for the ac relays). These relays must not be used i n
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o f the shunt s erves as an index mark, and the relay
critical applications where they may b e picked up for
pick-up setting i s i ndicated by the calibration scal e
marking which i s adj acent to the groove.
prolonged periods of time.
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The SC may be used in fault detector applications
The constructio n o f the plunger, core and flu x
where direct energization of a breaker trip coil is in­
shunt (which differ in details i n the various types o f
volved. I t should not be used to energize a timer. The
SV should be used only in overvoltage applications.
CON S T R UC T ION
0
when
energized
there
much
is
above
negligible
even on heavy overloads and in
ate on the solenoid principle. A U-shaped iron frame,
serves as the external magnetic path for the coil. The
even
Consequently,
The typ es SC , SC- 1 and SV and SV- 1 relays op er­
mounted on the moulded base, supports the coil and
these relays) causes t h e plunger t o float in its ener­
gized positi o n , without being held agai nst a sto p ,
@
25
the
noise
pickup value.
and
chatter,
hertz applications.
The P olymer C orp .
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A II possihle con tingencies which may arise during installation , operatio n , or maintenance, and all
details and variations of' this eq u ip m e n t do n o t purport to be covered by these instruct ions. Iffurther
inj(mnatio n is desired hy p u rchaser regarding h is particular installa tion, operation or maintena.n ce of
h is eq u ip m e n t , the local Westingh ouse Electric Corporation representa tive should be contacted.
SU PERSEDES I .L. 41 -766. 1 G , DATED FEB R U ARY 1 973
0 D E N OTES C H A N G E FROM SU PERSEDED I SS U E.
-
EFFECTIVE J U LY 1 978
.c
om
TY P ES SC, SC- 1 , SV AN D SV- 1 R ELAY S
_
_
_
_
______
_
_
_
_
_
_
_
_
_
_
_
__
The c o r e , shunt and plunger con structi o n al so
the bas e, as a safeguard agai n st loo s ening of the
provides the high ratio of dropout to pickup i n the
screws. By rotating the brac k et on its mo unting screw
SC and SV relay s . Thi s ratio is above 9 0% for any
picku p setting. In the latch type relays it is necessary
and moving it along i t s slot, the contact ass embly can
for the plunger to rise with suffi cient fo rc e to oper­
moving contacts are mounted on a M i c arta insulation
ate the latch p o sitively and to d eflect the stationary
plate whi ch i s s ecured to the threaded end o f the plun­
be made either normally open or norm ally closed. The
ger shaft by a nut. The front edge of this i n sulatio n
the r el ay is de- energized, due to play in the latch.
plate op erates the indicator. The rear p orti o n o f the
It is necessar�· t o have a l o w e r ratio of dropout t o
plate is slotted and a post screwed to the frame p as s e s
pickup in, order t o obtain t h i s characteristic, and
thi s lower ratio m ay be d e sirable in some applica­
through thi s slot t o p revent the plate from rotati n g .
ua
ls
co ntacts suffici ently to p revent their opening, when
tions where the latch i s not required. The plunger
floats in its op erated po sition j u st as in the SC and
SV
relays.
The
dropout
ratio
varies
somewhat
for
J
.MOVING CONTACT-�l�§���
�'"--�
S
5
F
6
I
�-TAP TERMINAL
ca
WHEN U S E D
tri
1.
8REAK,
COIL
0�
TAf'PEO
TO H IIUIO
U.1i3E
87176 6
Fig.
MAH l
!s�����:E� �R�/
IIOTE:
FOR 1
FRONT VIEVV
tr
tM
/TERIV\IN�L
ar
'�·�·�
\
CONTACT
S E I T rH . �
lP
l
INSULATION
an
different shunt p o si ti o n s , but i s con stant for any one
setting.
Fi g. 2.
.c �-
Tll :" :t..:�r
L .
I
.
-
2
- - _ _ _ _Q_ _Q _ .
3
G)
@
0
0
FRONT YI(W
8
9
OW ERCUIIIEIIT UIIIT
-
--
L --
�
5:�
RED ttAIIDl£
TEST
T E S T S-I TCH
CI.WREIIT
�� -TEIII4 1 U,L
--CHA
S
SI S
SrHliH hh•
JACK
OPEitA rED
S iit l lC11
182A854
I nt ernal S ch em at i c o f th e S i n gle U n i t Type SC or
SC- 1 R elay in Th e Type F T 2 1 Case.
The moving contacts are double- faced so that they
can be " m ak e " or " br eak " and are connected to the
b a s e t er m i n al s by fl e x i b l e l e ad s . All contacts are
pure sil v e r . The co ntacts will carry 5 amp eres con­
I nt ernal Wiri n g o f th e R elays In Th e Small Gl ass
tinuou sly , and will interrupt 5 amp er e s at 1 1 5 volts
Case.
ac, or 1 ampere at
.E
lec
The shunt i s held in any d e si red po sition by p r e s­
The
1 25
volts de.
me chanical op eratio n indi c ators used on
sure from a curved arm m ade o f sh eet spring steel ,
the se relay s are sho c k p roof, and c an be used to in­
which i s fasten ed to th e bottom of the coil frame at
the rear of the shunt. Thi s spring arm i s shaped to
dicate on the up strok e or down strok e o f the plunger.
The indicator is reset by pulling out the knurled stud
extend around the shunt to the front o f the relay, and
which proj e cts through the cover nut. The ind i c ator
in its normal p o sition it e x erts suffi c i ent pressure
should be reset after e ac h relay operation becau s e
against the shunt to p revent any c reeping o f the shunt
otherwi s e there may be a o n e o r t w o p er cent decrease
o r unde sired change o f s etting. The front end o f the
in the operating value of the relay . The op eration in­
spring arm has a bent- o v e r tab o n whi ch thumb-pressure
dicator is ass embled at the factory to indicate on the
may be applied to move the arm out o f contact with
the shunt while the p o sition o f the latter is being
mounting screws which fasten the indicator to the
changed.
up strok e o f the plunger, but by removing the two
main fram e , turning the indicator brac k et around and
at the s am e time s w inging th e i ndicator flag 1 8 0°
brack ets. The s e ar e held in po sition on the base by
filister-head screws which are threaded into the ter­
on the down strok e o f the plunger. The rivet w eight
minal ins erts. L ock-washers are ass em bled inside the
must be removed from the indicator flag an d the latch
mc ulded terminal bushings between th e ins erts and
screen turned around to complete the assembly.
ww
w
The stationary contacts are ass embled o n slotted
2
about its shaft, the indicator can be set to indicate
'
'•P<,;-u<t4f'
.c
om
-= . _
' L:_
4 1:_
-7
:_
&_
&._
1H
---------------------·--
TY P E S SC, SC- 1 , SV AN D SV- 1 R ELAY S
I n c ertain app l i c at i o n s , a n e xtrem ely wide range
o f current adj u stment is d e si rabl e, and c ertain sty l e s
IMTERUL SCHEMAT I C
o f SC and SC- 1 relay s have b e e n provi ded w i t h tapp ed
coils to meet this requirement. The coil tap s are brought
out to a tap block mounted o n t h e l o w e r end of the re­
l ay frame or on the r e l ay sub- b a s e , depending on the
block is marked
with the m i n i m u m
pickup value of
each tap , and the shunt is adj u st ed in the usual man­
ner to obtain
an�·
pickup setting between taps. The
CV11TACTS E I Tn E � ---1 r1AH l diH.H, OR
J. ,.HE 0�
AS
plied in order that a c u stomer ma.v mark on it the in­
11[<,11.1 I � E D
dii�.U
-1-1 1·�· ·"l;·il-
L .
1
_
_ _ _ _Y
_ _
2
AS Rf.IJU I R E Q
KUO' UIH
(FAOII T WIEW)
( F R O M T l' l flfll )
lP
JACl
ca
II O H : C O l L S UrHD
FOR I TO 2 1:1 U J I O
lAJli[
tri
l82A85S
Internal S ch em at i c o f t h e Double Unit Type SC o r
th e Typ e F T2 1 C a se.
lec
in
8
T E S r SII'I TCn
TERM I riAL
0
l82A856
Internal S ch e m at i c of the Single Unit Type S V o r
ADJ US TM EN TS
SW I TCH
Cll�llf.JH TEST
SC- I R e l ay
0
FROIOT VI£V
9
RED H M D l E
_ _
For detailed FT case information refer to I . L .
41-076.
R[O IIAMOLES
- TEST
FROtiT VllW
G)
_
S V - 1 R elay in th e Type FT2 1 Case.
ar
ll l iit T
L E F [ rlAMD U" I [
3
q_ _Q _ Q _
0
"0
tM
Fi g. 4.
COIIfACT� - E I THER
14U[ 0� IIRtAK
Fig. 3.
J
an
dividual rel ay setting or settings if de sired.
r1
1 ,Jl
scale plate is not c alibrated fo r th e r e l ays with tap­
ped c o i l s , as there is not suffi cient space for mark ing
a scale for each tap. H o wever, the scale p l ate i s sup­
ua
ls
type o f c ase used. The conne ctor p late- o n the tap
IN S TALLA T ION
The r e l ays should be mounted o n switchbo ard
pan e l s or their equi val ent in a l o cation free from dirt,
.E
moi stur e , e x c e s sive vibrati'o n , and heat. Mount the
relay vertically by mean s o f the fou r mounting h o l e s
on t h e flange fo r semi-fl u s h mounting or b y mean s o f
AN D
MA IN TENANC E
The proper adju stments to insure correct opera­
tion of this rel ay have been made at the factory and
should not be di sturbed aft er receipt by the cu stomer.
I f the adj u s tments h ave been changed, the relay tak e n
apart for repai r s , or if it i s desired t o check t h e ad­
j u stment s at regular m ai nt enance periods, the in­
structions below should be followed.
All contacts should be c l eaned periodi c ally. A
contact burni sher Sil l S 2AS 3 6 H O 1 i s recommended for
thi s p ur p o s e . The u s e o f ab ras i v e m a t e r i al for cl e an­
ing cont acts i s not recommended, because of the
dan­
ger of embedding small p arti c l e s in the face of the
soft silver and thus impairing the contact.
Several
factors
may
affect the
dropout ratio of
the relay. Whatever affects the ratio does so because
either
the
dropout
or
picku p
or
both
are
affected.
the rear mounting stud or s t u d s f o r proj ection mou nt­
Obvi ou sly , inco rrect assem bly or interchange o f part s ,
such a s the u s e o f t h e SC plun ger with t h e S V core
i n g . Either a mounting stud or the mounting screws
tube , will alter the electri cal characteri sti c s . However,
may be util ized for grounding the relay. The el ectri­
the factor most lik ely to be encoun tered in servi c e is
cal connections may be made directl y to th e termi n a l s
frictio n . T h i s m ay be due to dirt or foreign material
between the plunger shaft and its beari n g s , to ex­
term inal s t u d s furn i s h ed w i t h the rel ay for : h i c k panel
c e s s ive pressure of the indicator screen on the i ndi­
w
by means o f screws f o r steel p anel mounting or t o t h e
ww
mounting. The terminal studs may be easily removed
o r i n s erted by l o cking two nuts on the stud and then
turni ng the proper nut with a wren c h .
cator, or to l e ad s so mis-shaped that they tend to
rotate or tilt the moving contact i n s u l ation p l ate
with appreciable force.
3
.c
om
TY P E S SC, SC- l , SV AN D SV- 1 R ELAY S
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
__
____
__
In o rder to remove the plunger and shaft ass embly ,
will eventually become gummy and prevent proper
it i s n e c e s sary to remove the setscrew and nut at the
operatio n . I t is recomme nded that the shaft be c l e an-
top of the shaft. The spool- shaped bushing assembled
o n the upper end o f the plunger shaft has a portion o f
i t s c enter s ectio n m achined o ff so that the sh aft i s
ing by gripping shaft and bushing with a pair o f long­
n o s e pliers while removing the s et screw and nut.
Then by p r e s s i ng down wi th the fingers on the upp er
end o f the shaft , the lower split sleeve which retai n s
the lower b e aring will b e forced out o f the thr e aded
tube, the beari ng will drop out freely, an d the upper
tot&Io\ClS - E I THfl
AS
Mot.fl: Oil NEAl
II(QUJHll
split sleeve will be fo rced o u t far eno ugh to p ermit
grasping it fo r remo val . The shaft and plunger as­
an
s embly then can be removed.
ua
ls
expo s ed a t t h i s p o i n t a n d can b e prevented from turn­
IITIIIUL SCIIDU TIC
tM
IOU: COUS TAPPED
FN 1 TO 25 UfJO
.....
ll l ..oii T nAIID II II I T
( F II O II T W I [W)
LHT HAKD UII I T
(FIIOIIT W I EW )
TEST
$11 1 TC1i
l83Al9 3
F i g. 6.
I n te rn al S c h em ati c of th e Three U n i t Type SC o r
SC- 1 R e l ay i n th e Typ e F T32 C a se.
lP
ed at i ntervals of approximately two years. When re­
TEST SWI TGII
�· [;:'
LOCAT I Otl O F EACH U II I T
II I GnT M.III D
�:
LGW
U T I II G
1I T
D.C.
!
I
LEFT HMO
IIIGHER
liT
u.lli
A.C.
tri
�
�O��Ei A , C .
FIIOIT V' I EV
ca
'
TEbWIAL
AIIIIAM 'EHEIIT OF U II I T S
TYrE OF UII I T
placing the lower bearing and the split sle e v e s , the
shorter sleeve ( a s s em bled below the b earing) should
be pushed in until it i s flu s h with the end o f the
threaded tube.
The mounting hol e s i n the o p e ration indicator
s c r e e n a r e s l o t t e d so t h at i t s p o si t i o n c an b e adj u s t e d .
For r el ay s i n w h i c h the moving c ontac t s a r e n o t latch­
l 82A8 5'7
ed in the operated po sition, the screen should be so
l o c ated that the indicator po sitively enters the
I n ternal S ch em ati c o f th e D o u b l e U n i t Type S V o r
screen opening when the contacts barely touch. F o r
latch- typ e relay s , the s c r e e n should b e so l o c at ed
S V- 1 R e l ay i n th e Type F T32 Ca se.
lec
F i g. 5.
Ofi£1Ali.D
lt&Oil l lli llll'-'1
ar
COUACTS • [ I THU
MAlE OM lla[U.
AS. lEQUIRED
CHASS IS
that good contact i s still obtained when the relay i s
The shaft and plunger a s s embly should be hand­
de- energized. The p r e s sure o f the screen agai n st the
led carefully to avoid bending the shaft or d amaging
indicator may be adj usted by bending the s c r e en be­
tween i t s lower end and the large elongated hole.
ped on its uppe r bearing s urfac e , below the spool­
Thi s pre s sure should be s u c h that the indicator will
shaped bushing, when l o o s e n i n g the nut and s e t s c r e w ,
b e h eld at any further po sition t o which it is moved
as this w o u l d almost c ertainly damage t h e bearing
surfac e . The s haft beari n g surface s s hould not be
afte r entering the screen opening. However, the mini­
mum amount o f pre s sure n e c e s sary to o btain t h i s ad­
c leaned or polished with any abrasive material, as
j us tment should not be e x c e eded app reciably , s i n c e
.E
the bearing surfac e s . The s haft should never be grip­
the pick-up val u e , a n d c o n s equ ently the rati o , will
shaft and cause diffi culty l ater. The plunger shaft
be affected. The purp o s e of thi s pre ssure is to elim­
and be arings may be cleaned by wiping them c are­
i n ate i ndi c ator rattle which might o therw i s e o ccur
under c ertain e nergized conditi o n s .
w
the abrasive p articles might become imbedded in the
fully with a clean , lint- l e s s cloth. This may be mois­
ww
tened with benzene o r some o ther cleaning sol vent if
n e c e ssary. U s e no lubri c ant o n the plunger shaft or
T h e moving contact l e ad s pass through i n sulation
bearings when re-ass embling the r elay , s in c e thi s
sl e e v e s assembled o n the shan k s o f the termin al clips
4
.c
om
I . L. 41 -766.1 H
TYP E S SC, SC- 1 , SV AND SV- 1 R ELAY S
C HARACTE RISTICS OF TYPES SC AND SC- 1 REL AY S
sc
sc
sc
sc
sc
sc
sc
sc
DC ,
DC ,
DC ,
DC ,
DC ,
DC ,
DC ,
DC,
DC ,
DC ,
DC ,
DC ,
DC ,
DC ,
DC ,
DC,
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
hz.
hz .
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
h z.
hz.
h z.
hz.
h z.
V . A . at
5 A mp s .
6 0 Cycles
D ropout
Ratio-AC
����
Dropout
Rati o- DC
- - - -- ---
��
. 5- 2
1-4
2-8
4- 1 6
1 0- 40
20-80
40- 1 6 0
4- 1 00 *
1.5
3
6
12
25
40
40
1 0- 1 5-20
99
28
6.9
1.5
.24
. 07
.03
1 . 7- 0 . 6-0 . 1 8
225
65
19
5
.7
. 16
.05
5- 1-0 . 2
9 0-98%
9 0-98%
9 0- 9 8 %
9 0-98%
90-98%
9 0-98%
9 0- 9 8%
9 0- 9 8%
65-80%
65-80%
6 5- 8 0%
6 5- 8 0%
6 5- 80%
6 5- 8 0%
6 5-80%
6 5- 8 0%
. 5- 2
1-4
2-8
4- 1 6
1 0-40
20-80
4 0- 1 60
4- 1 0 0 *
1.5
3
6
12
25
40
40
1 0- 1 5- 2 0
100
24
6
1.5
. 25
. 07
. 03
1 . 7-0 . 6- 0 . 1 8
210
60
16
5
.65
. 16
.05
5- 1 - 0 . 2
3 5- 6 0%
35-60%
3 5- 6 0%
3 5- 6 0%
3 5- 6 0%
3 5- 6 0%
3 5- 6 0%
3 5- 6 0%
2 5- 40%
2 5- 40%
2 5- 40%
2 5- 40%
25-40%
2 5- 40%
25- 40%
2 5- 40%
ua
ls
F r equency
Watts
5 Amps.
6 0 Cycles
an
Typ e
Ran g e o f
Adj u stm ent M a x . Amp s .
Continuo u s
Amp s .
* Coil has tap s o n which minimum pickups are 1 0 and 3 0 amperes.
60
60
60
60
50
25
DC
DC
7- 1 6
7 0- 1 6 0
1 40- 3 20
280-640
7 0- 1 60
7 0- 1 6 0
50- 1 5 0
1 00-300
60
60
60
60
50
25
DC
DC
NOTES: --Standard
V . A. at
1 1 5 v.
3.4
7.3
2.8
1 .5
4.8
6. 1
2.5
4.1
8.5
3.5
1 .4
4.8
7.1
3.2
� --�-
16
1 60
320
640
180
200
150
300
7- 1 6
7 0- 1 6 0
1 40- 3 2 0
280-640
7 0- 1 6 0
7 0- 1 6 0
50- 1 5 0
100- 300
tri
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
Watts at
1 1 5 V . AC
( 1 25 V. for D C )
ar
---��-
M a x . Volts
Continuous
lP
sv
sv
sv
sv
sv
sv
sv
sv
sv: 1
Range o f
Adj u stm ent
Volts
ca
Typ e
Frequ ency
( Cy c l e s )
tM
CHARACTERISTICS O F SV AN D SV- 1 RELAYS
current
relays
are
calibrated
on
60 hertz.
Thi s
calibration
is
9 0-98%
9 0- 9 8%
9 0- 9 8%
9 0- 9 8%
90-98%
90-98%
65-80%
6 5- 8 0%
40- 8 0%
40- 8 0%
40- 8 0%
40-80%
40- 8 0%
40- 80%
2 5- 40%
25- 40%
approximately
correct
bu t there w i l l be discrepancies of 10% to 15% at some points of scale.
lec
for 25 cycle and de applications,
16
160
320
640
1 80
200
150
300
Dropout
R atio
Val u e s of watts and volt- amp e r e s in the tabl e s are av erage for variou s plunger and shunt p o sition .
For the SC relay , volt- am p e r e s for pickup at minimum s ettin g are app roximately 3 . 4 and 1 . 4 for 6 0
Watts a t m i n i m u m setting are approximately 1 .0, .65 and .57 for 6 0 hertz, 2 5 hertz and
DC respectively. M u ltiply values by 16 for approximate burdens at max i m u m setting.
and 2 5 cycles.
For the SC- 1 r el ay , volt-amperes for pickup at minimum s etting are approxi mately 3. 5 and 1 . 3 for 6 0
.E
a n d 25 c�·cles. Watts a t m i n i m u m settings are 1 .3, .7 a n d .57 for 6 0 hertz, 25 hertz a n d de respectively
M u l tipl�· values by 16 for approximate burdens at max i m u m setting.
* The V . A. burde n s o f the SC and SC- 1 rel ay s at 3, 10 and 20 tim e s minimum pickup current are approx­
imately 3 1 , 240 and 7 7 0 V . A . resp ectively.
Dropout ratio vari e s some what with pickup adj u stment but will b e approximately constant fo r any
ww
w
given pickup s etting. L i mits in tab l e s include variables such as friction and other individual relay varia­
tions.
Maxi m u m continuous volts given for t h e SV a n d SV- 1 relays for a c are for the relay s e t for m i n i m u m
pickup. With th e relay set for maximum p ickup the c o ntinuous voltage c an be increased 1 0 to 20%.
5
.c
om
TY P E S SC, SC- 1 , SV A N D SV- 1 R ELAY S
__
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
Curve 143285
I II TEIUU.l SCHEMATIC
-·--·
I il
a
�
�J
COIIU.CTS - [ I TIIER
NU:E 01 IRUI AS
IE !lUl lED
sv,
sc
and SC-1 Relays on de
i� ��
t . ,;..���+HHf�BtHEfHBfHE���H+�
'
�" 2���
H II I
�
.11�
fjf � ��millillilmm
� z�,
l
��mlli��
TOP LEFT riAII D UII I T
(FROIIT YIEW.)
�
IOTTOM U II I T
�
I
'
t1
II
')fli
1.
C
� 0
�
•
�
\" t
IfJ).tl\)
(\
1
Max Setting
Min. Settmg
tt
I 1 1 frt'tt �
';\;..:. I It J1
j _it�
5 1I j1l_l
rt-ioJ.I Li 1 1 L /f •
'
TE&MIIUL
1
SC and SC-1 Relays and 60
Max . Settm g
Ill
100 zoo
400
600
t
Min . Setting t
I I i ! 't : llh -m:�:tsuu
i t i : i! i illill l l ! i i i ! I ! t i l l
I
-
ti I �
SV and SV-1 Relays on 60 hertz c
tM
TE.U SWI TCH
.
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I n ternal Schem ati c of th e Three U n i t Typ e SV o r
S V- 1 Relay i n the Typ e FT32 Case.
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which are attached to the base t ermin al s .
Typ i cal Time Curves fo r the Typ e s SC an cf S V
Relay s ( U s i n g Fiux Shunt for Pick - up A dju stm en t. )
These
collar under the insulation plate aft er raising the
sleeve s are notched at their upper end s , and the not­
plunger m anually. With the plunger rai sed, the insul­
ation plate sheuld be o scillated slightly in a horizon­
tal plane by twi sting it horizo n tally and rel e asing it.
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ches are toward th e c enter o f the relay . The leads are
b ent at approximately a right angle where they p a s s
o u t through t h e notc h e s , which aid s in preventing them
from coming into contact with t h e stationary contact
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brackets. Figure 1 1 sho w s p ro p erly coiled and ass em­
bled moving contact l e ad s .
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Although t h e moving contact l e ads are very flexi­
ble, if the l e ad s have been pulled out of their original
shap e by handling they m ay e x ert sufficient side pres­
sure on the shaft b e aring or twi sting force against
the guide post to c au s e appreci abl e friction and w ear.
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If this condition c ontin u e s for a long ,period o f tim e ,
the resulting w ear may affect t h e relay calibration o r
If in s everal trials the plate comes to r e st with the
c enter line of the contacts app ro ximately parallel to
the base and with its mounting hole fairly well c enter­
ed with the end of the shaft, if the plate doe s not tip
appreciably , and if the l ead s have a safe clearan c e to
the stationary co ntact brack ets, the l , - ad s are prop erly
shap ed.
I f this ch eck show s that r e- shaping i s n e c e s s ary,
it may be p o s sible to o btain sufficient correction by
bending the l e ad s sharply where they emerge from the
in sulation sleeves. O n e o r two p ai rs o f tweezers are
o r the dropout ratio notic e ably. In extreme cases the
tool s for re- sh aping the leads. If it is nece s s ary to
wear may progr e s s to a degre e which m ay occ asion ally
re- co il th e l e ad s , they should b e wound around a rod
c au s e failure o f the plunger to drop down when the re­
lay is de- energi zed.
having a diameter o f approximately 5/ 32" . The coil s
then should be stretch ed o ut j ust enough to avoid side
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pull o r twisting force o n the plunger a s s em bly.
Correct shaping of the leads is not difficult, and
they m ay be check e d readily by removing the guide
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p o st and the nut at the top of the shaft. The plunger
should be held in the rai sed po sition, eith er by e ner­
gizing the relay o r by pressing lightly against the
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In all relays except the SV -1 relay for ac, if the
stationary co ntact s are ass embled so that they clo s e
when the relay i s energized, they sho uld b e located
so that they barely touch the moving contacts when
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I.L.
41 -766.1 H
TY P E S SC, SC- 1 , SV AN D SV- 1 R ELAY S ------
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Fig. 9.
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the l atter are 5/ 3 2 " above th e de-energized po sitio n .
T h e moving co ntact s c an b e h eld in this po sition
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while the adj u stment i s being made by ins erting a
5 / 3 2 " spacer between the shaft coll ar and the top o f
t h e core. Thi s dimension should b e 3/ 1 6 " on th e SV1
relay
for
ac .
Both
contacts
should
touch
at
the
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s am e time when the plunger is rai s ed . When the plun­
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is moved upward against its stop , there s ho uld be a
slight defl ection of the stationary c ontact stop springs,
but this s hould not exceed 1/32 " . When the s tationary
co ntacts are reversed so that they are clo sed when
the relay i s de-en ergized, they s ho uld be located so
F i g. 1 0 .
V i e w o f Type SC Relay Sho wing Correct Sh ap i n g
o f M o v i n g Contact L eads.
that they j ust touch the moving contacts when the
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latter are 1 / 3 2 " above the de- energized position . On
some relays it may be found that when the co ntacts
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are u s ed in this po sition the relay m ay operate at
value s a few p ercent b elow the s cale markings. The
adj ustments spe cified fo r the stationary contacts are
important. Failure to observe them may c au s e improp er
relay operati o n , either directly o r after a p eriod of
s ervice. Contact po sition should not be u s e d as a
REN EWAL
PA RTS
Repair work c an be done most satisfactorily at the
factory. However, interchangeable p arts c an b e fur­
nished to the c u stomers who are equipp e d for doing
r ep air work . When ordering p arts , always give the com­
plete nameplate data.
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means o f altering the ratio o f dropout to pickup.
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TY P E S SC, SC- 1 , SV AN D SV- 1 R E L A Y S
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I NTERNAL SCHEMAT I C
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Internal Schematic for Re lays i n Front Connected
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All dimensions o r e i n inches.
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Outline and D r i l l ing P l an for R e lays i n Front Connected Case.
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TY P E S SC, SC- 1 , SV AN D SV- 1 R E L AY S
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Fig. 14.
O utline and D r i lling P lan for Three Unit R elays in the Type F T32 Case.
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W E STI N G H O U S E
R E LAY - I N ST R U M E NT D I V I S I O N
E LE CT R I C
CO R PO RAT I O N
CO RAL S P R I N G S, F L.
Printed in U.S.A.
•
OPERATION
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INSTALLATION
Westinghouse I . L. 41 -766.48
•
MAINTENANCE
INSTRUCTIONS
3. SVF or SVF- 1 relays with a pickup voltage
adjustable from 50 to 1 50 volts are also
covered.
4. SVF-3 is a three phase relay with a dropout
voltage value adjustable from 30 to 45 volts
phase to phase, for the relay rated 1 20 volts.
5. SVF-3 1 is a three phase relay with a dropout
voltage value adjustable from 1 8 to 30 volts
phase to phase, for the relay rated 1 20 volts.
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ser-vice, remove all blocking which may have been
inserted for the purpose of securing the parts dur­
ing shipment, make sure that all moving parts
operate freely, inspect the contacts to see that they
are clean and close properly, and operate the relay
to check the settings and electrical connections.
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CAUTION: Before putting protective relays into
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TY P E S SVF, SVF- 1 , SVF-3, SV F-3 1 R EL AY S
C O N STANT D RO PO UT O R P I C KU P VO L TAG E
VAL U E F ROM 20 TO 60 H ERTZ
APPLICATI O N
6. SVF-3 or SVF-3 1 relays with a pickup voltage
value adjustable from 50 to 1 50 volts are also
covered.
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Where dropout independent o f frequency is re­
quired, the SVF and SVF- 1 instantaneous under­
voltage relays are recommended. Dropout is ad­
justable over the range of 24-36 and 30-45 volts
for the SVF- 1 and SVF relays respectively with a
maximum dropout variation of ± 5% between 20
and 60 hertz. Where the relay is required to oper­
ate only during balanced 3 phase conditions, the
single phase SVF or SVF- 1 is suitable. Where
balanced conditions may not exist when relay
operation is required, the 3 phase relay design type
SVF-3 or SVF-3 1 is recommended.
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For supervising initiation of bus transfer,
where the undervoltage relay is measuring the
residual voltage of the motor load, the 3 phase
SVF-3 or SVF-3 1 is recommended, since one or
more phase voltages may be reduced by a fault on
the supply circuit prior to transfer.
CONTENTS
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This IL covers the following four types of
relays: SVF, SVF- 1 , SVF-3 and SVF-3 1 .
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1 . SVF is a single phase relay with a dropout volt­
age value adjustable from 30 to 45 volts for a
relay rated 120 volts.
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2. SVF -1 is a single phase relay with a dropout
voltage value adjustable from 24 to 36 volts
for a relay rated 1 20 volts.
7.
Relays with rated voltage other than 1 20 volts
will have dropout ranges proportioned to the
1 20 volt values.
C O N ST R U C TI O N A N D O PERAT I O N
RELAYS
The single phase SVF and SVF- 1 relays con­
sist of an SV or SV- 1 voltage unit respectively, a
reactor, a series resistor and a full wave rectifier.
The resistor and reactor are proportioned to
maintain a constant effective ampere turn to the
SV or SV -1 from 20 to 60 hertz.
The three phase SVF-3 and SVF-3 1 relays
consist of an SV or SV- 1 voltage unit respectively,
A ll possible contingencies which may arise during
installation, operation, or maintenance, and all
details and variations of this equipment do not
purport to be co vered by these instructions. If
jimher information is desired by purchaser re­
garding his particular ins tallation, operation or
maintenance of h is equ ipment, the local West­
inghouse Electric Corporation representative
should be contacted.
S U PERS E D ES I. L. 41 -766.4A dated MARCH 1 969
C O M PL ET E R EVI S I O N
EFFECTIVE J A N UA RY 1 977
The stationary contacts are assembled on
slotted brackets. These are held in position on the
base by filister-head screws which are threaded
into the terminal inserts. Lock washers are
assembled inside the moulded terminal bushings
between the inserts and the base as a safeguard
against loosening of the screws. By rotating the
bracket on its mounting screw and moving it along
its slot, the contact assembly can be made either
normally closed or normally open. The moving
contacts are mounted on a Micarta insulation
plate which is secured to the threaded end of the
plunger shaft by a nut. The rear portion of the
plate is slotted and a post screwed to the frame
passes through this slot to prevent the plate from
rotating. The moving contacts are double-faced so
that they can be "make" or "break" and are con­
nected to the base terminals by flexible leads. All
contacts are pure silver.
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The coil surrounds a core and flux shunt, the
upper end of the core is threaded and projects
through the upper side of the frame to which it is
fastened by a nut. A tube threaded on the outside
at its lower end is assembled in the core, and the
threaded ends extends below the core. A
Fluorosintt bushing, which is the lower bearing
for the plunger shaft, is assembled in the lower end
of this threaded tube. It is held in place by two
split spring sleeves, one above and one below the
bearing. The split sleeves must be compressed to
insert them in the tube and they will remain at any
position in which they are placed. The bearing for
the upper end of the plunger shaft is a Fluorosintt
bushing which is pressed in the upper end of the
core. This bearing is visible when the plunger is in
the energized position. The plunger itself does not
touch the walls of the tube in which it moves.
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The types SV and SV- 1 voltage units operate
on the solenoid principle. A U-shaped iron frame,
mounted on the moulded base supports the coil
and serves as the external magnetic path for the
coil.
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VOLTAG E U N IT (SV OR SV-1 )
steel, which is fastened to the bottom of the coil
frame at the rear of the shunt. This spring arm is
shaped to extend around the shunt to the front of
the relay, and in its normal position it exerts suf­
ficient pressure against the shunt to prevent any
creeping of the shunt or undesired change of set­
ting. The front end of the spring arm has a bent­
over tab on which thumb pressure may be applied
to move the arm out of contact with the shunt
while the position of the latter is being changed.
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three external series resistors, three full wave
bridge rectifiers, and two capacitors. The full
wave bridges plus the filter capacitors provide a
steady de voltage to the SV or SV- 1 unit of the
relay from 20 to 60 hertz.
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
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A flux shunt which surrounds the core is
screwed on the tube, and its lower end projects
below the relay frame. The position of this shunt
determines the dropout setting of the relay. The
lower end of the shunt is beveled and knurled, so
that it can be grasped by the fingers and turned to
change the setting. A calibrated scale plate is
mounted adjacent to the shunt. A groove just
above the knurl in the lower end of the shunt
serves as an index mark, and the relay pick-up set­
ting is indicated by the calibration scale marking
which is adjaient to the groove.
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The construction of the plunger, core and flux
shunt (which differ in details in the various types
of these relays) causes the plunger to float in its
energized position without being held against a
stop.
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The shunt is held in any desired position by
pressure from a curved arm made of sheet spring
tTrademark of the Polymer Corporation
2
C HARACTERI ST I C S A N D S ETTI N G S
The types SVF and SVF- 1 single phase and
SVF-3 and SVF-3 1 three phase relays are supplied
with dropout voltages constant between 20 and 60
hertz, and have a scale calibrated in dropout volts.
See Table 1 . These relays are designed for opera­
tion on a supply having a nominal value of 1 20
volts. The scale markings were determined by
reducing the voltage gradually from 1 20 volts. The
characteristics of the relays are such that at any
setting, the relay will drop out at the same value of
voltage (within 5%) for any frequency between 20
and 60 hertz. The pickup voltages will vary
somewhat on various relays.
The insensitivity of the single phase relays to
frequency is obtained primarily by operating the
voltage unit on full-wave rectified ac. To compen­
sate for the tendancy of the voltage unit to res-
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
I.L. 41 -766.48
TABLE I
Typical
1 20 Volt Relay
Dropout Voltage Pickup Values
Less Than
Range ±5%
Typical
Operate Tlme1
ms
Typical
Reset Time2
ms
Burden3
Per Phase
Volt Amps
70
60 Hz 1 7 / 27° lag
25 Hz 1 8 . 5
70
60 Hz 1 7 / 27° lag
25 Hz 1 8 .5
30-45
75
10
SVF- 1
24-36
75
10
SVF-3
30-45
95
1 5-25
SVF-3 1
1 8-30
100
1 5-25
75-60
75-60
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Relay
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1 Time to open the normally closed contacts.
2Time to close the normally closed contacts.
3Values of volt-amperes are average for various plunger and shunt positions.
For detailed FT case information refer to I.L.
4 1-076.
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pond to instantaneous voltage values and,
therefore, to drop out at higher rms voltages as the
frequency decreases, a reactor is used in the ac cir­
cuit. The effect of the reactor is to cause the rec­
tified current to increase slightly as the frequency
decreases, thus keeping the dropout point at ap­
proximately the same rms v oltage value
throughout the frequency range. The series
resistor in the ac supply renders negligible the
effect of the relay coil temperature on the
operating point. Because of residual magnetism,
when the voltage is reduced from 1 20 volts, the
dropout point may be slightly higher than it is
when reduced from the pickup values.
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I N STALLAT I O N
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The relays should be mounted on switchboard
panels or their equivalent in a location free from
dirt, moisture, excessive vibration, and heat.
Mount the relay vertically by means of the four
mounting holes on the flange for semi-flush mount­
ing or by means of the rear mounting stud or the
mounting screws may be utilized for grounding
the relay. The electrical connections may be made
directly to the terminals by means of screws for
steel panel mounting or to the terminal studs fur­
nished with the relay for thick panel mounting.
The terminal studs may be easily removed or in­
serted by locking two nuts on the stud and then
turning the proper nut with a wrench.
A DJ U STM E NTS A N D MAI NTE N A N C E
The proper adjustments to insure correct
operation of this relay have been made at the fac­
tory and should not be disturbed after receipt by
the customer. If the adjustments have been chang­
ed, the relay taken apart for repairs, or if it is
desired to check the adjustments at regular
maintenance periods, the instructions below
should be followed.
All contacts should be cleaned periodically. A
contact burnisher S #1 82A836H0 1 is recommend­
ed for this purpose. The use of abrasive material
for cleaning contacts is not recommended,
because of the danger of embedding small par­
ticles in the face of the soft silver and thus im­
pairing the contact.
SV U N IT C H E C K A N D MAI NTE N AN C E
Several factors may affect the dropout ratio of
the relay. The factor most likely to be encountered
in service is friction. This may be due to dirt or
foreign material between the plunger shaft and its
bearings, or to leads so misshaped that they tend
3
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
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The shaft bearing surfaces should not be clean­
ed or polished with any abrasive material, as the
abrasive particles might become imbedded in the
shaft and cause difficulty later. The plunger shaft
and bearings may be cleaned by wiping them
carefully with a clean, lintless cloth. This may be
moistened with benzene or some other cleaning
solvent if necessary. Use no lubricant on the
plunger shaft or bearings when reassembling the
relay, since this will eventually become gummy
and prevent proper operation. It is recommended
Correct shaping of the leads is not difficult,
and they may be checked readily by removin g the
guide post and the nut at the top of the shaft. The
plunger should be held in the raised position,
either by energizing the relay or by pressing lightly
against the collar under the insulation plate after
raising the plunger manually. Release the plate
and if in several trials the plate comes to rest with
the center line of the contacts approximately
parallel to the side of the base, its mounting hole
fairly will centered, the plate not tip appreciably,
and the leads have a safe clearance to the
stationary contact brackets, the leads are properly
shaped.
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In order to remove the plunger and shaft
assembly, it is necessary to remove the set-screw
and nut at the top of the shaft. The spool-shaped
bushing assembled on the upper end of the plunger
shaft has a portion of its center section machined
off so that the shaft is exposed at this point and
can be prevented from turning by gripping shaft
and bushing with a pair of longnose pliers while
removing the set screw and nut. Then by pressing
down with the fingers on the upper end of the
shaft, the lower split sleeve which retains the lower
bearing will be forced out of the threaded tube, the
bearing will drop out freely, and the upper split
sleeve will be forced out far enough to permit
grasping it for removal. The shaft and plunger
assembly then can be removed.
twisting force against the guide post to cause ap­
preciable friction and wear. If this condition con­
tinues for a long period of time, the resulting wear
may affect the relay calibration or the dropout
ratio noticeably. In the extreme cases the wear
may progress to a degree which may occasionally
cause failure of the plunger to drop down when the
relay is de-energized.
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to rotate or tilt the moving contact insulation
plate with appreciable force.
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If this check shows that re-shaping is
necessary, it may be possible to obtain sufficient
correction by bending the leads sharply where they
emerge from the insulation sleeves. One or two
pairs of tweezers are convenient tools for re­
shaping the leads. If it is necessary to re-coil the
leads, they should be wound around a rod having a
diameter of approximately 5 /32" . The coils then
should be stretched out just enough to avoid side
pull or twisting force on the plunger assembly.
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that the shaft be cleaned at intervals of a p­
p roximately two years. When replacing the lower
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bearing and the split sleeves, the shorter sleeve
(assembled below the bearing) should be pushed in
until it is flush with the end of the threaded tube.
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The moving contact leads pass through insula­
tion sleeves assembled on the shanks of the ter­
minal clips which are attached to the base ter­
minals. These sleeves are notched at their upper
ends, and the notches are toward the center of the
relay. The leads are bent at approximately a right
angle where they pass out through the notches,
which aids in preventing them from coming into
contact with the stationary contact brackets.
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Although the moving contact leads are very
flexible, if the leads have been pulled out of their
original shape by handling they may exert suf­
ficient side pressure on the shaft bearing or
4
SV U N IT C O NTACT SETTI N G S.
ALL RE LAYS
The normally open contact gap should be set
at 5/32", and the follow (travel after contact
closure) should be 1 /32" maximum. The moving
contact can be held in position by placing a 5 /32"
spacer between the shaft collar and the top of the
core.
The normally closed contacts should have a
1 /32" follow in the deenergized (reset) position .
When normally open contacts are changed to nor­
mally closed, the pickup value may be changed by
a few percent.
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
I.L. 41 -766.48
When the contacts are both normally open or
both normally closed, an effort should be made to
have both contacts make at the same time.
Contact position should not be used as a
means of altering the ratio of dropout to pickup.
voltage from 1 20 volts to the dropout value when
checking the dropout setting. If a new scale is be­
ing calibrated, mark the 35, 40, and 45 volt points.
The dropout value at 25 hertz should not vary
more than 5% from the 60 hertz value.
Use the following procedure for calibrating the
relay if the relay has been taken apart for repairs
or the adjustments disturbed. This procedure
should not be used until it is apparent that the
relay is not in proper working order.
SVF-3 three phase relay. Apply 3 phase, 1 20
volts 60 hertz phase to phase to the relay case or to
the relay with the appropriate resistors in series.
Calibrate as per the single phase values for the
SVF.
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CALI B RAT I O N
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The pickup value for the 45 volt setting must
be less than 80 volts.
The pickup value for the 45 volt setting must
be 96 volts ac or less.
Apply de voltage to the coil terminals.
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SV U N IT ELECTRICAL C H E C K
SVF-1 single phase relay. Set the index mark
on the shunt to the 24 volt mark, (Approximately
3/4" below the frame). Apply 120 volts 60 hertz
and adjust the resistor for a dropout value of 24
volts 60 hertz, (Approximately 600 ohms). Reduce
the voltage from 120 volts to the dropout value
when checking the dropout setting. If a new scale
is being calibrated, mark the 24, 30 and 36 volt
points. The dropout value at 25 hertz should not
vary more than 5% from the 60 hertz value.
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1) For the single phase relay disconnect one lead
from the rectifier bridge to the coil terminal
and connect a variable de voltage supply to the
coil terminals.
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2) For the three phase relay open the Flexitest
switches and connect a variable de voltage sup­
ply to terminals 9 and 6.
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The SV unit shunt should be capable of a de
pickup adjustment of 1 1 volts minimum to 33
volts maximum. At 33 volts the dropout value
should be greater than 10 volts and less than 14
volts for the SVF- 1 and SVF-3 1 relays. At 33
volts the dropout value should be not less than 22
volts for the SVF and SVF-3 relays.
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Reconnect all wires that have been removed.
RELAY CALIBRATION
CAUTION: If the three phase relay is being
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tested out of the case, the proper resistors per the
schematic, must be connected into the circuit
before proceeding.
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SVF single phase relay. Set the index mark on
the shunt to the 30 volt mark (approximately 3/ 4"
below the frame). Apply 1 20 volts 60 hertz and
adjust the resistor for a dropout value of 30 volts
60 hertz, (Approximately 500 ohms). Reduce the
The pickup value for the 36 volt setting must
be less than 75 volts.
SVF-3 1 three phase relay. Apply 3 phase 1 20
volts 60 hertz, phase to phase, to the relay case or
to the relay with the appropriate resistors in series.
Check and calibrate for the 1 8, 24 and 30 volt
dropout values.
The pickup value for the 30 volt setting must
be 100 volts ac phase to phase or less.
R E N EWAL PA RTS
Repair work can be done most satisfactorily at
the factory. However, interchangeable parts can
be furnished to the customers who are equipped
for doing repair work. When ordering parts,
always give the complete nameplate data.
5
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
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Fig. 1. Type S VF-31 Three Phase Relay (Front Vie w)
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Fig. 2. Type S VF-31 Three Phase Relay (Rear View)
1-External Resistor Assembly
(Note: For Types SVF and SVF-1 Single Phase Relay a single resistor and reactor are mounted inside case.)
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TYPES SVF, SVF- 1 , SVF-3, SVF-31 RELAYS
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I.L. 41 -766.48
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Fig. 3. Type S VF-3 1 Three Phase Relay without case (Fron t View)
1 - Two independent reversible stationary contacts.
2-Moving Contact arm with two contacts.
3-Piunger.
4-Coil.
5-Calibrated Scale.
6-Adjustable Magnetic Shunt.
7-Core Screw.
Fig. 4. Type S VF-31 Three Phase Relay without case (Rear View).
1-Diodes
2- Capacitor
7
_.._+----+-- REACTOR
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TERM I N AL
FRONT V I EW
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1 8 4A 7 9 6
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CHASS I S OPERATED
SHORTINJ SWITCH
1 84A l 9 3
Fig. 6. Internal Schematic of the type S VF and S VF- 1 Under­
voltage Single Phase Relays, with two circuit opening
contacts with chassis shorting switches.
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Fig. 5. Internal Schematic of the Type S VF and S VF-1 Under­
voltage Single Phase Relays, with two circuit opening
contacts without chassis shorting switches.
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INTERNAL SCHEMATIC
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
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3
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REACTOR
FRONT VIEW
TERM I NAL
35 1 3A0 5
Fig. 7. Internal Schematic of the type S VF and S VF- 1 O ver­
voltage Single Phase Relays, with two circuit closing
contacts.
Fig. 8. Internal Schematic of the Type S VF and S VF-31 Under­
voltage Three Phase Relays, with two circuit opening
contacts without chassis shorting switches.
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1 84A 1 9 4
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
I.L. 41 -766.48
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•
3 5 1 3A 0 8
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Fig. 9. Internal Schematic of the Type SVF-3 and SVF-31 Under­
voltage Three Phase Relays, with two circuit contacts
with chassis shorting s witches.
35 1 3A 0 6
Fig. 1 0. Internal Schematic of the Type S VF-3 and S VF-3 1
Undervoltage Three Phase Relays, with one circuit
opening and one circuit closing contact.
3 5 1 3A0 7
Fig. 1 1. Internal Schematic of the Type S VF-3 and S VF-31
Overvoltage Three Phase Relays, with two circuit
closing contacts.
9
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TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
. 563
( 1 4 . 30)
-+
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. 250 OIA. 4 HOLES FOR
1 6 • 3 5 l . 190-32 MTG. SCREWS
5 .219
( 1 32 .56)
-+--+--�
1 0 . 438
( 2 65. 13)
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( 161.93)
10
5 7 - D - 79 0 1
Fig. 12. Outline and Drilling Plan for Type S VF and S VF-1 Single Phase Relays in Type FT 2 1 Case.
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I.L.
TYPES SVF, SVF-1 , SVF-3, SVF-31 RELAYS
41 -766.48
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Fig. 13. Outline and Drilling Plan tor Type S VF-3 and S VF-31 Three Phase Relays in Type FT 2 1 Case (Semi Flush Mounting.)
11
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W E STI N G H O U S E
R E LAY- I N ST R U M E NT D I V I S I O N
E LE CT R I C
CO R P O RATI O N
C O R A L S P R I N G S , F L.
Printed in U .S.A.
•
OPE R ATI O N
I.L. 41 -788.5
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I N S T A L L A TI O N
A D D E N D U M TO Westi n gh ouse
•
M A I N TEN A N CE
I N S T R U C T ri © N S
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TYPES SSV-T A N D SSC-T R ELAYS
(For Class I E Application)
This sheet notes changes which should be made in instruction leaflet I.L. 41-766.5 dated November 1977.
Page 4 - Paragraph at top of left column to be replaced by:
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Indicatin g Contactor Switch ( ICS)
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Close the main relay contacts and pass suf­
ficient de current through the trip circuit to close
the contacts of the ICS . This value of current
should be not greater than ICS's rated current.
The operation indicator target should drop freely.
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The contact wipe should be approximately
0.0 1 6 inches. The bridging moving contact should
touch both stationary contacts simultaneously .
. ·1 II rws.1 ihle con ringencies wh ich may arise during installa t i o n . opera t io n . or main tenance. and all
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derails and \'(/ria r ions of' this eq u ip m e n t do n o t purport to be co vered by these ins tructions. !jji1rther
in/omu/ l ion is desired h r purchaser regarding h is particular installa t io n . opera tion or main tenance of
h is eq u ip 1 1 1 en r . rhe local Wes tinghouse Elect ric Corporation representative should be conracted.
ADDENDUM TO I.L. 41 -788.5
EFFECTIVE FEBRUARY 1 979
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OPERATION
•
MAINTENAN C E
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INSTALLATION
Westi nghouse I . L. 41 -766.5
•
INS T R U C T I O NS
CAUTI ON: Before putting relays i n t o service,
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TY P E S S SV- T A N D S S C-T R E LAYS
( For C l ass IE Appl ication)
The type SSC-T and SSV-T relays have a
remove all blocking which m ay have been inserted
high
fo r the purpose of securing the parts during ship­
suitable
ment. M a ke sure that all m oving parts operate
accurate current or voltage level detecto r .
ratio
freel y . I nspect the contacts to see that they are
to check the settings and electrical connections.
M aterials h ave been selected and
tested to insure that the relays will perform their
their
design
l i fe
w hen
operated in a normal environment as defined by
A N S I standard
plate,
C37. 90 - 1 97 1 , when exposed
seismic
events
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to
producing
a
Shock
Response Spectrum within the l imits of the relay
ca
rating.
an
output telephone relay,
t h e semi- flush FT- 1 1
also
includes
Switch)
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"Class I E" is the safety classification of the
electric equipment and systems i n n uclear power
generating stations that are essential to emergency
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sh utdown of the reactor, containment isolation,
and
several
for
one
Flexitest case. The relay
ICS
indication
( I ndicating
and
seal-in
C ontactor
purposes.
The relay chassis is draw-out construction for
easy of test and m aintenance.
to radiation levels up to 1 04 rads, and when sub­
jected
particularly
requiring
associated com ponents . The relay is mounted i n
ar
for
are
C O N ST R U CT I O N
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tested to establish their suitability for Class I E
function
and
applications
a printed circuit board with a transformer, a scale
These relays have been specially designed and
intended
in
T h e type SSC-T or SSV-T relay consists o f
APPLICATI O N
applications .
drop-out
use
an
clean and close properly, and operate the relay
of
for
The components are connected as shown m
Fig. 4, 5 , and 6 .
I nput Transformer - The input transformer
is
a
two
winding
type with
a center tapped
secondary winding. The secondary is connected
to two ful l wave rectifiers.
cooling o f the reactor, and heat removal from
Recti fiers and DC Power Supply - There are
the containment and reactor, or otherwise are
two
essential
diodes and a capacitor is used as an input signal
preventing
significant
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release
of
radioactive m aterial to t h e environment.
The solid state types SSC-T current relay
and SSV-T voltage relay are high seismic relays
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and suitable for nuclear power staion relaying
protection. They are adjustable over a wide range
of current and voltage and h ave a calibrated
full wave rectifiers.
One with two zener
and connected to a level detector (setting) circu i t .
T h e zener diodes a r e a l s o used as surge protec­
tions. The other ful l wave rectifier is used as de
power supply . For type SSC-T overcurrent relay,
a resistor-zener diode is needed in order to keep
the current transformer' s l inearity.
scale plate which indicates the pick-up setting.
The output unit is a telephone relay and an I C S
Setting Circuit - The setting circuit is con­
nected between zener-rectifier and sensing circuit.
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( I ndicating Contactor Switch) seal-in device.
A II possible con tingencies which may arise during installatio n , opetation , or main tenance, and all
details and l'aria tions of this eq u ipment do n o t purport to be co vered by these ins truc tions. Iffurther
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inj(mna tion is des ired by purchaser regarding h is particular installa tio n , operation or maintenance of
h is eq uip m e n t , the local Wes tinghouse Electric Corporation represen tative should be con tacted.
N E W I N FO R M AT I O N
EFFECTIVE N OV E M B E R 1 977
a
scale
plate.
The
potentiometer
has
a
locking feature to m i n imize accidential change
of setting .
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It consists of two resistors and a potentiometer
with
For undervoltage application, the t ran sistors
and Q2 are n o rmally conducting and the
telephone relay i s pulled in. A s soon as the i n pu t
voltage d r o p s below the setting, the transistor
Sensing Circuit - The sensing circuit consists
of a transistor, a zener diode, and several associ­
Q2 is turned off and the telephone relay is re­
leased .
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ated components. It is actually a level detector.
If the i n put voltage from the rectifier i s h igh
enough to break down the zener diode, the output
transistor will be turned o n .
C H ARACTE R I ST I C S
I . Overcurrent Relay SSC-T
Output circuit - The output circuit consists
of a transistor driver and a telephone relay . The
equipped with 2-A type contacts. The over or
relay ( S SV-T) has a telephone
relay equipped with 1 -A & 1 - B type contact s .
I ndicating C ontactor Switch ( ICS) - T h e I n­
dicating contactor switch is a small de operated
clapper
type device .
A
m agnetic armature to
2 amps
2 amps
2.0 -
8 amps
8 amps
4.0 - 1 6 amps
10 amps
10
10 amps
- 40 amps
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which leaf-spring m o unted contacts are attached .
0.5 -
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under voltage
Continuous Rating
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Range
overcurrent relay ( S SC-T) has a telephone relay
It is attracted to the m agnetic core upon energiz­
ation of the switch . W hen the switch closes the
com pleting
the
trip
circu i t .
A lso
during
this
operati o n , two fingers on the armature deflect
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a spring l ocated on the front of the switch w hich
allows the target to drop . The target is reset
from the outside of the case by a push rod located
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at the bottom of the cover.
I Second Rating:
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m oving contracts bridge two stationary contacts
O P ERAT I O N
2 8 times the continuous
rating.
Operating Frequency: 50/60 H z
Temperature Error:
2% between - 20°C and
Dropout R a t i o :
90% to 98%
65%C.
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The block diagrams o f the SSV-T a n d SSC-T
are shown i n Fig.
1 , 2, and 3 and the internal
Response Time:
Pickup Time
=
10
-
1 3 ms
schematic are shown i n Fig. 4, 5, and 6 . For
overvoltage
and
overcurrent
applicat i o n ,
the
transistor Q2 is normally not conducting and the
Dropout T i m e
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telephone relay i s deenergized. The transistor Q I
=
I 0 - 26 m s
is used as an emitter follower. When ac voltage
or current is applied to the primary of the t rans­
For 2 to 1 5 times pickup
former (T) a voltage is produced on the secondary
side
that
is
proportional
to
the
input.
setting value ( Fig. I 0)
The
potentiometer ( R2) i s for the pick-up setting. I f
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the voltage fro m rectifier ( Z I , Z 2 , and C2) is
Transident Overreach : 5 %
large en ough to exceed the breakdown voltage
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of zener diode Z 5 , the zener diode conducts to
turn
on
the
transistor
telephone relay.
2
Q2
and
operate
Bu rden:
(Table I )
F requency Respon se:
( Fig . 1 2)
the
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I . L. 41 -766.5
TABLE I (60 hertz)
relay . Setting in between the scale m arking can
be made by applying the desired voltage or current
and adj usting the potentiometer until the tele­
Pickup Current Setting
Lowest Setting
Highest Setting
VA
P.F. Angle ji
VA
P.F. Angle ,i
2.0
0.5
8.5°
4.0
1 2. 5 °
4.0 - 1 6.0
0.5
8.5°
5.0
1 2.5°
0.5 -
2.0 -
8.0
1 0 .0 - 40.0
8.5°
0.5
The relays should b e moun ted on switchboard
panels or their equivalent in a location free from
1 0. 7 °
8 .0
dirt ,
excessive
vibration
and
heat .
m ounting h oles on the flange for the semi- flush
type FT case. The m ounting screws may be uti­
60 - 1 40 V olts
lized fo r grounding the relay . External toothed
320 V olts
an
1 40
m oisture,
M ount the relay vertically by means of the four
2 . Over/ U nder voltage Relay SSV-T .
Range:
I N STALLAT I O N
1 2.5°
5.0
1 0 .0°
0.8
phone relay operate s .
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Range (Amps)
washers are provided for use i n the l ocations
280 - 640 Volts
shown on the outline and drilling plan to facilitate
making a good electrical con nection between the
H ighest voltage o f r:mge
setting.
screws as required for poorly grounded or i nsula­
ting panel s . Other electrical connections may be
Operating Frequency: 50/60 H z .
m ade directly to the terminals by means of screws
2% between - 20 ° C and
+ 65 ° C
For detail i n formation on the FT case refer
92% to 99%
Response Time:
Picku p Time - 7 - 1 0 ms
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Dropout Ratio:
Dropout Time
14 - 40
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m s ( Fig. 9)
1 V A at 1 20 volts 60 hertz
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Burde n :
for steel panel m ounting .
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Temperature Error:
panel . G round Wires are affixed to the m ounting
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Continuous Rating:
relay case, its m ou nting screws and the relay
Trip Circuit
The main contacts will safely close 30 a mperes
at 250 volts de and the seal in contacts of the in­
to I . L . 4 1 -076 for semi-flush m ounting.
A D J U ST M E NT AND M A I N TE N A N C E
The
proper
adj u stments
to
insure
correct
operation of this relay have been made at the
factory and should not be disturbed after receipt
by the customer.
Acceptance Tests:
The
fol lowing
check
is
recommended
to
in sure that the relay is in proper working order.
Refer to the internal schematics and apply volt­
age or current to the proper terminals.
I . M in i m u m Trip Current - Check pickup
dicating contactor switch (when supplied) will
at
circuit b reaker. The indicating contactor switch
accomplished by applying the specified voltage
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safely carry this current long enough to trip a
(when su pplied) has a pickup of approximately
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I a mpere. Its de resistance is 0 . 3 7 o h m s .
SETTI NGS:
T h e relay must b e set for t h e desi red levels of
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voltage or curre n t . The pickup o f the relay i s made
by adj usting the potentiometer i n the front of the
minimum
and
maximum
settings .
This
is
or current and checking the pick up of the output
telephone relay when the ac input i s within ± 5 %
o f the settings.
2. Dropout Ratio - A fter checking picku p ,
gradually reduce t h e input . T h e dropout should
be greater than 92% and 90% of the pickup for
SSY-T and SSC-T relays respectivel y .
3
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I . Contact Wipe -
Repeat above except to pass 8 5 % of I C S
A dj ust the stationary
nameplate rating cu rrent . Contacts should not
contacts so that both stati o nary make w i th the
pick up and target should not drop.
m oving contacts simultaneously and wipe 1 /64"
to 3 j 64" when the armature is against the core.
R O UT I N E M A I N T E N C E
con tacts should be cleaned at least once every
year.
A
contact
burnisher
is
S# i 8 2 A 8 3 6 H O I
recommended for cleaning purpose. It is recom­
For double trip ICS u n its, adj ust the third
con tact so that it makes with its stationary con­
tact at the same time as the two main contacts
or up to I /64" ahead.
mended to change the potentio menter R2 every
ten yea rs .
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A l l relays' calibration should b e checked and
2. Target
-
M an ually
raise
the
m oving
contacts and check t o see that the target drops
at the same time as the contacts m ade or u p to
C A LI B RATI O N
tru bed . This procedure should n ot be used u n ti l
it is apparent t h a t the relay is not in proper
work i ng orde r . A new scale plate may be nec­
essary when parts are changed .
necessary . H o wever care s h o u l d be exercised so
that the target will n ot drop with a slight jar.
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U se the fo llowing procedure for calibrating
the relay if the relay adj ustments have been dis­
an
I j ! 6" ahead. The cover may be removed and
the tab holding the target reformed slightly i f
3. Pickup - U nit should pickup at 98% o f
rating a n d not pickup at 8 5 % o f rating. I f nec­
essary the cover leaf springs may be adj usted .
To l ower the pickup current use a tweezer or
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Dial Calibration - I . Connect on ohmmeter
across proper relay terminals which connect to
the telephone relay contacts.
leaf spring and the front surface of the cover at
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2 . Apply the desi red voltage or current to rel ay
similar tool and squeeze each leaf spring approxi­
m ate equal by applying the tweezer between the
term inals 8 and 9 .
3 . Turn potentiometer o n front o f relay counter­
ca
clock wise from extrem e clock wise position until
the relay operates as indicated by the o h mmeter.
the bottom o f the l ower window.
If the pic k u p i s low the front cover m ust b e
removed a n d the l e a f spring b e n t outward equally.
R E N EWAL PARTS
Indicatin g Contactor Switch ( ICS)
Repair work can be done m ost satisfactorily
at the factory. H owever, interchangeable parts
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I n itially adj ust unit on the pedestal so that
armature fi ngers d o not touch the yoke in the
reset position . This can be done by l oosening the
screw
in
the
molded
pedestal
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mo unting
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m oving the ICS in the downward position .
4
and
can be furn ished to custo mers who are equipped
for doing
repair
work .
W hen
ordering
always give the complete n ameplate data .
parts,
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INDICATING
CONTACTOR
SWITCH
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INDICATING
CONTACTOR
SWITCH
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I .L. 41 -766.5
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(35 1 6A 14).
Fig. 1. Block Diagram of the Type SSV- T Relay in the Type
TERMINAL
CHASSIS
OPERATED
SWITOi
SHORTlNG
(35 1 6A 1 5).
Fig. 2. Block Diagram of the Type SSG- T Relay in the Type
FT- 1 1 Case
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FT- 1 1 Case
CURRENT TEST
JACK
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INDICATING
CONTACTOR
SWITCH
REO HANDLE
CURRENT TEST
JACK
TERMINAL
(351 7A80).
Fig. 3. Block Diagram of the Type SSG- T Relay (Double Trip)
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COM P LOCAT ION • . . . . • • 3516A17
BLOCK DIAGRAM_ _ _ _ _ ••3516AI4
(7758589).
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Fig. 4. Internal Schematic of the Type SSV- T Relay
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BLOCK DIAGRAM ... -3516AI5
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Fig. 5. Internal Schematic of the Type SSG- T Relay
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I.L. 41 -766.5
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LO CATION
DIAGRAM
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3516Ai8
3517A80
(7758 758).
SSG- T
Relay
(Double Trip)
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NO.
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(35 1 6A 1 8).
Fig. 8. Component Loca tion on SSG- T Module
7
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CURVE NO 6 1 9 506
45
ua
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50
T Y P I C A L TIME CURVES OF THE
TYPE SSV - T
R E LAY
( RA N G E 60 - 1 4 0 V . )
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DROPOUT
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SETTI N G
( FINAL VOLTAGE
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I OO V . P I C K U P SETT I N G
( FI NAL VOLTAGE = 1 20V. )
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10
80 V.
( INITIAL
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20
40
60
VOLTS
80
100
120
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(61 9506)
Fig. 9. Typical Operating and Reset Time Curves of the Type SSV- T Relay
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I . L. 41 -766.5
C U R V E NO. 6 1 9507
26
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MULT I P L E S
7
8
9
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13
14
15
(619507).
Fig. 10. Typical operating and Reset Time Curves of the Type SSG- T Relay
9
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(61 9504).
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Curve
of the
Type
SSV-T Relay
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I.L. 41 -766.5
ID
0
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(61 9505).
Fig. 12. Typical Frequency Curve of the Type SSG- T Relay
11
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F O R C L A S S 1 - E A P P L I C AT I O N
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OUTL I N E AND DRIL L I N G FOR R ELAY CAS E T Y PE FT - I I
6.375
(161.93)
••
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PANEL LOCATI O N
S E M I - FLUSH MTG,
(l��
DIA,
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4 HOL E S fOR
,190-32 MTG. SCREWS
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DIMEN S IONS IN I N C H ES
DIMENSIONS IN M M
3.188
(80.98)
an
. 563
(14.30)
ORILUNG
FOR SEM I - FLUSH WTG.
ww
w
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PAN E L CUTOUT 8
(35 1 9A 65).
Fig. 13. Outline and Drilling Plan tor the Type SSV-T and SSC-T Relay in Semi-Flush FT- 1 1 Case
WESTI N G H O USE
R E LAY - I N ST R U M E N T
ELECTRIC
D IVI S I 0 N
CO RPO RATI O N
N EWA R K , N . J.
Printed in U.S.A.
•
OPERATION
•
I . L . 4 1 -766 . 1 G
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I N ST A L L A TI O N
Westinghouse
M A I N TE N A N C E
I N STRUC T I O N S
bearing for the plunger shaft, i s assembled in the
lower end of this threaded tube. It i s held in plac e
by two split sp ring sleev e s , one above and one below
the bearing. The split sleeves must b e compressed
to insert them in the tube and they will remain at any
Before putting protective r elays into
service, remove all blocking which m ay have been
ins erted for the purpose of securing tbe parts during
shipment, make sur e that all moving p arts operate
freely, inspect the contacts to s e e that they are clean
and close properly, and operate the relay to check
the settings and electrical connections.
position in which they are placed. The bearing for
*
the upper end of the plunger shaft is a Fluoros int®
bushing which is pres sed in t he upper end of the
cor e . This bearing is visible w he n the plunge r is in
the energized positi on. The plunger itself does not
touch the walls of the tube in w hie h .it moves .
tM
APPLI CAT I ON
an
CAU TION
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ls
TYPES SC. SCI. SV AND SV-1 RELAYS
The type s SC and SC- 1 current rel ay s and the
A flux shunt which surrounds the core is screwed
on the tube, and its lower end proj ects below the re­
lay frame. The position of this shunt determines the
pick-up setting of the relay . The low e r end o f the
shunt is beveled and knurled, so that it can b e grasped
ca
lP
ar
types SV and SV- 1 voltage relays are applicable where
an instantaneous plunger relay o f high accuracy is
required. The se relays are suitable for protective ser­
vic e , and for au xiliary service where some of their
sp ecial featur e s are desired. They are adj ustable over
a wide range of voltage or current, are provided with
m echanical operation indicators , and have a c alibra­
ted scal e which indicates the pick-up setting. Both
contacts can readily be changed from "make " to
" break " . The volt- ampere burden is low.
by the fingers and turned to change the setting. A
calibrated scale plate is mounted adj acent to the
shunt. A groove just above the knurl in the lower end
of the shunt serves as an index mark, and the relay
pick-up setting is i ndicated by the calibration sc ale
m arking which i s adj acent to the groove.
Thi s lower ratio m ay be desirable in some application s ,
these relays) cause s the plunger to float in its ener­
gized position, without being held against a stop ,
even when energized much above the pick-up value.
Consequently, there is negligible noi se and the con­
tacts are free from chatter, even on heavy overloads
and in 25 cycle applications.
tri
The typ e SC and SV relay s have a high r atio of
drop-out to pick-up ( 9 0 to 98%) and are particularly
suitable for fault detector relays. The type SC- 1 and
SV- 1 relays have a lower ratio of drop-out to pick-up.
lec
and i t makes po ssible a plunger pull characteristic
which permits the operation of a l atching device. The
latch is combined with the mechanical operation indi­
cator, and p revents further motion of the mo ving con­
tacts after the relay has operated.
.E
CON STRU CTI ON
The types SC , SC- 1 and SV and SV- 1 relay s oper­
ate on the solenoid principl e. A U-shaped iron frame,
mounted on the moulded base, supports the coil and
w
serves as the external magnetic path for the coil. The
coil surrounds a core and flux shunt. The upp er end
of the core is threaded and proj ects through the upper
* side of the frame , to w hich it is fastened by a nut. A
rn
The core, shunt and plunger construction also
.
provides the high ratio of drop-out to pickup in the
SC and SV relays. This ratio is above 90% for any
pick-up setting. In the latch type r elays it is neces sary
for the plunger to rise with sufficient force to oper­
ate the latch positively and to deflect the stationary
contacts sufficiently to p revent their opening, when
the relay is de- energized, due to play in the latch.
It is necessary to have a lower ratio of drop-out to
the outside at its lo wer end is assem­
pick-up in, order to obtain thi s characteristi c , and
bled in the core , and t he thre aded e nd e xtends below
t he core . A Fluorosint® bushing, which is the lower
@ The Polymer Corp .
this lower ratio may be d esirable in some applica­
tions where the latch is not required. The plunger
ww
tube thre aded
The construction of the plunger, core and flux
shunt ( which differ in details in the variou s types of
S U P E R S E D E S I . L . 4 1 -766 . 1 F
*D enotes chan ge from su pe rse ded i ss u e .
E FF E C T I V E F E BR U A R Y 1 973
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______________
___
_
_
_
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TY P ES SC, SC- 1 , SV AN D SV- 1 R EL AY S
OVUCUIIEIT UII I T
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182A854
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----- c".usu onuru
$hOalllhl SWI TCM
SC- 1 Rttloy I n Th tt Typ• F T 2 1 CoSit.
Cos&.
The moving contacts are double-faced so that they
can be " m ak e " o r " br eak " and are connected to the
base terminal s by fl exible l e ads. All contacts are
pure silver. The contacts will carry 5 amperes con­
tinuously , and will interrupt 5 amp er e s at 1 1 5 volts
A-C , or 1 amp ere at 1 25 volts D-C .
ar
floats in its operated po sition j u st as in the SC and
SV rel ay s . The drop-out ratio varies somewhat for
different shunt position s , but is constant for any one
setting.
ca
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The shunt is held in any desired po sition by pres­
sure from a curved arm made of sheet spring steel,
which is fastened to the bottom of the coil frame at
the rear of the shunt. This spring arm is shaped to
extend around the shunt to the front of the r el ay, and
in its normal position it e x erts sufficient pressure
against the shunt to p revent any creeping of the shunt
tri
or undesired change of s etting. The front end of the
spring arm h as a bent- o v e r tab on which thumb-pressure
m ay be applied to move the arm out of contact with
the shunt w hile the position of the latter is being
changed.
T h e me chanical operation i ndicator s used on
thes e relays are shockproof, and can be used to in­
dicate on the up strok e or down strok e of the plunger.
The indicator is r eset by pulling out the knurl e d stud
which proj ects through the cover nut. The indi c ator
should be reset after e ach relay operation becau s e
otherwise there may be a o n e o r t w o p er cent decrease
in the op erating val u e o f the relay . The operation in­
dicator is assembled at the factory to indicate on the
the bas e, as a safeguard against loosening of the
screen turned around to complete the assembly.
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moulded terminal bushings between the inserts and
up strok e of the plunger, but by removing the two
mounting screws which fasten the indicator to the
main fram e, turning the indicator bracket around and
at the sam e time swinging the indicator flag 1 8 0°
about its shaft, the indicator can be s et to indicate
on the down strok e of the plunger. The rivet w eight
must be remo ved from the indicator flag an d the l atch
The stationary contacts are assembled o n slotted
brack ets. These are held in position on the base by
filister- head screws which are threaded into the ter­
.E
minal ins erts. Lock-washers are as sembled inside the
screws. By rotating the bracket on its mounting screw
I n certain applications, an e xtrem ely wide range
of current adj ustment i s d esirable , and c ertain sty l e s
moving contacts are mounted on a Micarta insulation
plate which is secured to the threaded end o f the plun­
of S C and SC- 1 r el ays have b e e n provided w i t h tapped
coils to meet this requirement. The coil t ap s are brought
out to a tap block mounted on the lower end of the re­
lay frame or on the relay sub-base, depending on the
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and moving it along its slot, the contact assembly can
be made either normally open or norm ally closed. The
ger shaft by a nut. The front edge of this i n sulation
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plate operates the indicator. The rear portion of the
plate is slotted and a post screwed to the frame passes
through thi s slot to prevent the plate from rotating.
2
type o f case used. The conne ctor plate on the tap
block is m ark ed with the minimum pick-up value of
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TY P E S SC, SC- 1 , SV AN D SV- 1 R EL A Y S
_____________________
_
I. L
._
4_
t -7
_
6_
6._
;..
1G
IITllllllL SCIIEIIAT IC
ua
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COUACTS • f.HIIU
M1UE OR �tiU&
AS ilEOU I R U
LEFT MID U ll i T --·
( FilOAT 'tiEW)
TUT
IWITC"
CURifJIT TUT
JACit
'----""'-----"=:::�=_,"'-t==='�:._ �::::ao:���:•
IIOU: COJLI TiPND
TO 11. lAIII
fOl 1
....,
Fig. 3.
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182A855
an
TEIIMiiAL
In tern al Schemat i c o f th e Double Unit Typ• SC o r
SC- 1 Relay in the Type FT2 1 Case.
I n ternal Schemati c o f the Sing/• Unit Type S V or
SV- 1 Relay In the Typ e FT2 1 Case.
should not be di sturbed after receipt by the customer.
I f the adjustments have been changed, the relay taken
apart for repairs, o r if it is desired to check the ad­
j ustm ents at regular m aint enan ce period s, the in­
struction s below should be followed.
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each tap, and the shunt is adjusted in the usual man­
ner to obtain any pick-up setting between taps. The
scale plate is not c alibrated for the r el ay s with tap­
ped coils , as there is not sufficient space for marking
a scale for each tap. However, the scale plate is sup­
plied in order that a customer m ay mark on it the in­
dividual rel ay setting or settings if desired.
Fig. 4.
182A856
I N STALLATI ON
tri
The relays should be mounted o n switchboard
panels o r their equivalent in a lo cation free from dirt,
moi sture , excessive vibratio n, and heat. Mount the
relay vertic ally by means of the fou r mounting holes
on the fl ange fo r semi-fl u s h mounting o r by means of
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the rear mounting stud or studs for proj ectio n mou nt­
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ing. Either a mo unting stud or the mounting screws
may be utilized for grounding the relay. The electri­
cal connections m ay be made directly to the terminal s
by mean s o f screws for steel panel mounting o r to the
terminal studs furnished with the relay for thick panel
mounting. The terminal studs may be easily rem o ved
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
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For detailed F'T case information refer to I . L .
4 1·076.
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A DJ U STM E N T S
AN D
MAI N TENANCE
The proper adj u stments to insure correct opera­
tion of this r el ay hav e been made at the factory and
All contacts should be cleaned periodically. A
contact burni sher S# l 8 2 A8 36H 0 1 is re commended for
thi s purpose. The use of abrasive material for cl ean­
ing co ntacts is not recommended, because of the dan­
ger of embedding small particles in the face of the
soft silv er and thus impairing the contact.
Several factors m ay affect th e drop-out ratio o f
the relay. Whatever affects the ratio does s o because
either the drop-out or pick-up o r both are affected.
Obviously , incorrect assembly o r interchange o f part s ,
such a s t h e use o f t h e S C plunger with t h e S V core
tube , will alter the electrical characteri stics. However ,
the factor most likely to be encountered in service is
frictio n . This m ay be due to dirt o r foreign material
between the plunger shaft and its bearings , to ex­
cessive pre ssure of the indicator screen on th e indi­
cator , o r to le ads so mis- shaped that they tend to
rotate or tilt the moving contact insulation plate
with appreciable force.
I n order to remove the plunger and shaft assembl y ,
it is necessary t o remove t h e setscrew and nut a t the
top of the shaft. The spool- shaped bushing assembled
o n the upper end of the plunger shaft has a portion of
3
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-------
*IACII � EU11£1
Mlloft 01 MEAl U
•ou•ao
CCNITo\CTS - ElfltU
f&AI;E 01 ISI:EU
AS IEQVIR£D
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l'Y P E S SC, SC- 1 , SV AN D SV- 1 R EL AY S
TOP L.ll. '."\fl
(,.liT f l af )
LEfT MUD IHI I T
( F ROIIT • l EW)
TEST SWI TC.
Of
AIIAit�fMEIIT Of UII I T
UI I T
� !!�
�';'.��' ..
•n: COJLI. UPPED
fOI 1 TO Ji IAJJO
·-
L.OCATIOII Of EACII U I I T
I I Qn T liAII O
LEFT
K��
LOIIE
u: ;ATIIIi 1 111\tlt: �TIIQ
I
I
D.C.
I
A.C.
182A857
I n ternal Schematic of the Double Unit Typ e S V o r
S V- 1 Relay i n th e Type F T32 Case.
Fig. 6.
JUT SI'ITctl
- CUUIIT Rtf .....
T�IIM.
183Al9 3
I n te rn al Schem atic of the Three U n i t Type SC o r
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Fig. 5.
"'ASI II INIA.I
Mllt lltl •• u..
tM
TYPE
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TUtUUL
FIIOIIT flEW
ed at intervals of approximately two years . When r e­
placing the lower bearing and the split sleeves, the
shorter sleeve ( assembled below the bearing) should
be pushed in until it is flush with the end of the
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it& c enter section machined off so that the shaft i s
expos ed at thi s point a n d can be prevented fro m turn­
ing by gripping shaft and bushing with a pair of long­
nose pliers while removing the set screw and nut .
Then by pre ssing down with the fingers on the upp er
SC- 1 Relay i n the Typ e F T32 Case.
tri
end of the shaft, the lower split sleeve which retai n s
the lower bearing will b e forced out o f t h e thread e d
tube , t h e bearin g will drop o u t freely, a n d t h e uppe r
split sleeve will b e forced o u t far enough t o p ermit
grasping it for removal . The shaft and plunger as­
sembly th en can be removed.
.E
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The shaft and plunger assembly should be hand­
led carefully to avoid bending the shaft or damaging
the bearing surfac e s . The s haft should never be grip­
ped on its upper bearing surfac e , below the spool­
shaped bushing, when loosening the nut and setscrew,
as this would almost c ertainly damage the bearing
surface . The shaft bearing surfaces should not be
cleaned or polished with any abrasive material, as
the abrasive particles might become imbedded in the
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shaft and c ause difficulty later. The plunger shaft
and bearings may be cleaned by wiping them c are­
fully with a clean , lint-less cloth. This may be mois­
tened with benzene or some other cleaning solvent if
necessary. Use no lubricant o n the plunger shaft o r
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bearings when r e- ass embling t h e relay , since this
will eventually become gummy and prevent proper
operatio n . It i s recommended that the shaft be clean-
4
threaded tube.
The mounting holes in the operation indicato r
screen are slotted so that its po sition c an be adj usted.
For r el ay s in which the moving contacts are not latch­
ed i n the operat ed position , the screen should be so
located that the indic ator positively enters the
screen opening when the contacts barely touch. For
latch-type relay s , the screen should b e so located
that good contact i s still obtained when th e relay i s
de- energized. The pressure of the screen again st t h e
indicator m a y be adj usted b y bending t h e screen be­
tween its lower end and the l arge elongated hole.
This pressure should be such that the indicator will
be held at any further position to which it i s moved
after entering the screen opening. However, the m ini­
mum amount of pressure necessary to obtain this ad­
j ustment should not be exce eded appreciably . sin c e
the pick-up value, and consequently the ratio , will
be affected. The purpose of this pressure is to elim­
inate indicator rattle which might otherwi se o ccur
under certain energized condition s .
T h e mo ving contact l ead s p a s s through insulation
sleeves assembled on the shank s o f the termin al clips
•
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om
TYP E S SC, SC- 1 , SV AHD SV- 1 R EL AY S
._
-7_
I.
66
_
_
L_
1G
._
4 1_
______
_
___________
CHARACTERISTICS OF TYPES SC AND SC- 1 RELAYS
Frequency
. 5- 2
1-4
2-8
4- 1 6
1 0-40
20-80
40- 1 6 0
4- 1 0 0 *
. 5- 2
1-4
2-8
4- 1 6
1 0-40
20-80
40- 1 60
4- 1 0 0 *
V . A . at
5 Amp s .
6 0 Cycl es
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
hz.
hz .
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
h z.
hz.
hz.
1.5
3
6
12
25
40
40
1 0- 1 5-20
1.5
3
6
12
25
40
40
1 0- 1 5-20
D ropout
Ratio-AC
Dropout
Ratio-De
90-98%
9 0-98%
9 0-98%
9 0-98%
90-98%
90-98%
9 0- 9 8%
90-98%
3 5-60%
3 5-60%
3 5- 60%
3 5-60%
3 5-60%
3 5-60%
35-60%
3 5- 6 0%
6 5- 8 0%
6 5-80%
6 5-80%
6 5- 8 0%
6 5- 80%
65-80%
65-80%
65-80%
25-40%
25-40%
2 5- 40%
2 5- 4 0%
2 5- 40%
2 5- 40%
25- 40%
25-40%
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ls
99
225
28
65
6.9
19
1.5
5
. 24
.7
. 07
. 16
.05
.03
1 . 7-0 . 6-0 . 1 8
5- 1-0 . 2
1 00
210
24
60
6
16
1.5
5
. 25
.65
. 07
. 16
. 03
. 05
1 . 7-0 . 6- 0 . 1 8
5- 1- 0 . 2
taps o n w hich minimum pickups are 10 and 30 amperes.
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
an
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
DC . 25
DC , 2 5
DC , 25
DC , 2 5
DC . 2 5
DC . 2 5
DC , 25
DC , 2 5
DC . 25
DC , 2 5
DC . 25
DC , 25
DC , 2 5
DC , 2 5
D C , 25
DC. 25
* Coil has
Watts
5 Amps.
60 Cycles
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Type
sc
sc
sc
sc
sc
sc
sc
sc
Range of
Adj ustment M ax . Amp s.
Continuous
Amps.
CHARACTERISTICS OF SV AND SV- 1 RELAYS
60
60
60
60
50
25
DC
DC
7- 1 6
7 0- 1 60
1 4 0- 3 20
280-640
7 0- 1 60
7 0- 1 6 0
50- 1 5 0
1 00-300
7- 1 6
70- 160
1 40- 3 2 0
280-640
70- 160
7 0- 1 60
5 0- 1 5 0
1 00-300
16
160
320
640
180
200
1 50
300
16
160
320
640
1 80
200
150
300
Watts at
1 1 5 V . AC
( 1 2 5 V . for DC)
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------
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SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
60
60
60
60
50
25
DC
DC
Max. Volts
Continuous
ca
sv
sv
sv
sv
sv
sv
sv
sv
sv: 1
Range of
Adjustment
Volts
tri
Type
Frequency
( Cycles)
V . A . at
1 1 5 v.
3.4
7.3
2.8
1.5
4.8
6. 1
2.5
4.1
8.5
3.5
1 .4
4.8
7.1
3.2
Dropout
Ratio
90-98%
9 0- 9 8%
90-98%
90- 9 8%
90-98%
90-98%
65-80%
65-80%
40-80%
40-80%
40-80%
40-80%
40-80%
40-80%
25-40%
25- 40%
NOTES: --Standard current relays are calibrated on 60 cycl es. This calibration is app ro ximately correct
2 5 cycle and DC ap plicatio n s , but there will be discrepan c i e s o f 1 0% to 1 5% at s o m e p o i n t s o f s c al e' .
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for
Values of watts and volt- amp e res in the tables are average for various plunger and shunt position.
For the SC relay , volt- amperes for pickup at minimum setting are app roximately 3 . 4 and 1 . 4 for 60
and 2 5 cycles. Watts at minimum setting are approximately 1 . 0 , . 6 5 and .57 for 60 cycl e s , 2 5 cycles and
DC resp ectively. Multiply value s by 16 for approximate burdens at maximum settin g.
.E
For the SC- 1 relay , volt- amperes for pickup at minimum s etting are approximately 3.5 and 1 . 3 for 60
and 2 5 cycles. Watts at mi nimum settings are 1. 3 , . 7 and . 57 for 60 cycles, 2 5 cycles and d- e resp ecti vely
Multiply values by 16 for approximate burdens at maximum setting.
* The V. A. burdens of the SC and SC- 1 rel ays at 3 , 1 0 and 20 times minimum pickup current are approx­
imately 3 1 , 240 and 7 7 0 V. A. respectively.
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Dropout ratio varies somewhat with pickup adjustment but will be approximately constant for any
given pickup s etting. Limits in tables include variables such as friction and other individual relay varia­
tions.
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M aximum continuous volts given for the SV and SV- 1 relay s for A-C are for the relay set for minimum
pickup. With the relay set for maximum pickup the continuous voltage can be increased 1 0 to 20%.
5
.c
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TY P E S SC, SC- 1 , SV AN D SV- 1 R EL A Y S
------
Curve
I•TUWAL SCHEMATIC
ua
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COITACTS - E I TMU
NUE 01 IlEAl AS
ll OW I IlD
TOP LEfT KAIID U l l f
( n o n ut•l
IOTTOM
11•1T
an
TOf' l l in T MUD U I I T
( FICHU UU)
"
TUMUIAL
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183Al92
Fig. 8.
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I n ternal Schctm ati c of the Thrctct U n i t Typ ct SV o r
SV- J Relay i n the Typ e FT32 Case.
tM
T ES T SWI TCH
Fig. 7.
1432 85
ca
which are attached to the base terminal s. These
sleeves are notched at their upper ends , and the not­
ches are tow ard the c enter of the relay . The leads are
bent at appro ximately a right angle where they pass
out through the notch e s , which aids in preventing them
Typ i cal Timet Curves fo r thct Typu SC and S V
Rctlay s ( U s in g Fi u x Shunt for Pick - up A c/ju stmctn t. }
collar under the insulation plate after raising the
plunger manually. With the plunger r ai sed, th e insul­
ation plate shsuld be o scillated slightly in a horizon­
tal plane by twisting it horizontally and releasing it.
If in several trials the plate comes to r e st with the
from coming into contact with the stationary contact
center line of t h e contacts app roximately parallel to
brack e t s . Figure
with its mounting hole fairly well center­
ed with the end of the shaft, if the plate doe s not tip
appreci ably , and if the l eads have a safe clearance to
the stationary contact brackets, the l e ads are properly
shap ed.
sho w s p rop erly coiled and assem­
bled moving contact
tri
11
leads.
.E
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Although the moving contact l e ads are very flexi­
ble, if the l e ad s hav e been pulled out of their original
shape by handling they may exert sufficient side pres­
sure on the shaft bearing or twisting for c e against
the guide post to c au s e appreci able friction and wear.
If this condition continues for a long period of tim e ,
the resulting wear may affect t h e relay c alibration o r
or t h e dropout ratio noticeably. In extreme cases the
w ear may progress to a degree which m ay occasionally
w
cau s e failure of the plunger to drop down when the re­
lay is de- energized.
the base and
If this check sho w s that re- shaping is necess ary ,
it may be possible to o btain sufficient correction by
bending the l e ads sharply where they emerge from the
insulation sleeves. One or two p ai r s o f tweezers are
tool s for re- shaping the l e ads. If it is necessary to
re- coil the l e ads, they should be wound around a rod
having a diameter of approximately 5/ 3 2 " . The coils
then should be stretched out just enough to avoid side
pull or twisting for c e on the plunger assembly.
I n all relays except the SV- 1 relay for A- C , if th e
post and the nut at the top of the shaft. The plunger
should be held in the rai sed po sition, either by ener­
gizing the relay or by pressing lightly against the
stationary contacts are assembled so that they close
when the relay i s energized, they should be located
so that they barely touch the moving contacts when
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Correct shaping of the l eads i s not difficult, and
they may be checked r eadily by removing the guide
6
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-----_-t_ -
VS£ .,_..,.,.AI_ MW
. "''"' -N£L
77-D- 418
O u tl i n e & Dri l l i n g P l an fo r Single Unit R elays in
Small Glass Pro;ection Case.
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Fig. 9.
an
·--- 5/z_�·-
I.L. 41-766.1G
---- -------
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TY P E S SC, SC- 1 , SV AN D SV- 1 R E LAYS
the l atter are 5/32" above the de- en ergized po sition.
The moving co ntact s can b e h eld in this position
ar
while the adj ustment i s being made by ins erting a
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5/3 2" spacer between the shaft collar and the top o f
t h e c o r e . Thi s dimension should be 3/ 1 6 " on t h e SV1 rel ay for A-C . Both contacts should touch at the
same time when the plunger i s raised. When the p lun­
i s moved upward against its stop , there should be a
ca
slight deflection of the stationary c ontact stop spring s ,
b u t this should not e x c eed 1 / 3 2 " . When t h e stationary
contacts are reversed so that they are closed when
the relay is de-energized, they should be located so
that they j us t touch the moving co ntacts when the
tri
latter are 1 / 3 2 " above the de-energized position . On
some relays it may be found that when the c ontacts
are used in this p osition the relay may operate at
.E
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values a few p er cent below the s c al e markings. The
adj ustments specified fo r the stationary contacts are
important. Failure to observe them may cause imprope r
relay operation , either d ir e ctly o r after a p eriod o f
V i e w of Type SC R el ay Sho wing Co rrect Sh ap i n g
o f Moving Con tact L eads.
means of altering the ratio of dropout to p ickup.
R E N E WAL
PA RTS
Repair work can be done m o st satisfactorily at the
factory. However, interchangeabl e p arts c an be fur­
nished to the customers who are equipped for doing
repair work. When ordering parts , al ways give the c o m­
pl ete nameplate data.
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service. Contact po sition sho uld not be used as a
F i g. 10.
7
.c
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TY P ES SC, SC- 1 , SV AN D SV- 1 R E L AYS
_
_
_
_
_
_
_
_
_
_
_
_
_
_
__
_
_
_
_
_
_
_
I N TERNAL SCHEMAT I C
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- TERMI NALS
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CONTACT
FRONT Y I EW
Internal S c h e m a t i c for R e lays in Front Conne cted
Cf:EARANCE . HOLE
FOR . 1 90-32 SCREW
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..
..
----,
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TERMI NALS
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F ig. 1 1 .
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....--- 5 . 3 1 2
8
Fig. 12.
O ut l i n e a n d D r i l l i n g P l an for R e lays
in Front C o n n ected Case.
I. L
._
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-7 66.
1 ·_
.._
_
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TY P ES SC, SC- 1 , SV AN D SV- 1 R E L AY S,
__ _ _ _ ____
_
_
_
_
_
_
_
_
_
_
_
_
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P'AIEL CU10itT I DII I LLII
POl SIMI FLI. MTI·
IPAUIIS FOR
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TOMIUL
P'AIEL DIILLI .. H
P'WB:TIOit MTa·
11111£1
CtmiUT FH
( FaT YI!W)
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57-D-7901
F ig. 13
O utline and Drilling Plan for S in gle and Double Unit Relays i n the Type FT2l Case.
9
1 19
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32
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TY P ES SC, SC- 1 , SV AN D SV- 1 R EL AY S
------
1 ' �I �I !, ,
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20 NOLES
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PAIEL CUTOUT & DRI LLIIG
FOR SEMI FLUSN MTG.
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TEIIMI IAL AID
MOUIIT IIG Dn'll LS
PMEL DR4Llt16 DR
CUTOUT FOil I'IIW ECTIOII Mfa.
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57-D- 7903
F i g . 14.
O utline and Drilling P l an for Three Unit Relays in the Type F T32 Case.
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WEST I N G H O US E
R E LAY- I N ST R U M E IIJT
ELECTRI C
D IVI S I O N
CO RPORAT I O N
N EWAR K , N . J.
Printed
in
U.S. A .
•
O PE R A T I O N
•
I . L . 41 -766 . 1 G
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I N S T A L L A Tl 0 N
Westinghouse
MAINTENANCE
I N STRUC T I O N S
bearing for the plunger shaft, i s assembled in the
lower end o f this threaded tube. It i s held in place
by two split sp ring sleeves, one above and one below
the bearing. The split sleeves must be compressed
Before putting protective relays into
service, remove all blocking which may hav e been
ins erted for the purpose of securing tne p arts during
shipment, make sure that all moving p arts operate
freely, inspect the contacts to see that they are clean
and close properly, and operate the relay to check
the settings and electrical connections.
to insert them in the tube and they will remain at any
position in which they are placed. The bearing for
*
the upper end of the plunger shaft is a Fluorosint®
bushing which is p re s s ed in t he upper end of the
cor e . T his bearing i s visible when the plunger is in
the energized positi on. The pl unger itself does not
touch the walls of the tube in w hie h .it moves .
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APPLI CATION
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CAU TION
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TYPES SC. SCI. SV AND SV-1 RELAYS
A flux shunt which surrounds the core is screwed
on the tube, and its lower end proj ects below the re­
lay fram e . The position of this shunt determine s the
pick-up setting of the relay . The low e r end of the
shunt i s beveled and knurled, so that it can be grasped
by the fingers and turned to change the setting. A
calibrated scale plate is mounted adj acent to the
shunt. A groov e just above the k nurl in the lower end
of the shunt serves as an index m ark , and the relay
pick-up setting is i ndicated by the calibration scal e
marking which i s adj acent t o t h e groove.
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The typ e s SC and SC- 1 current relays and the
typ e s SV and SV- 1 voltage relay s are applicable where
an instantaneous plunger relay of high accuracy i s
required. The se relays a r e suitable for protective ser­
vice, and for auxiliary s ervice where some of their
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special features are d esired. They are adj u stable over
a wide range of voltage or current, are p rovided with
mechanical operation indicators, and have a c alibra­
ted scale which indicates the pick-up setting. Both
contacts can readily be changed from "make " to
"break " . The volt-ampere burden is low.
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The typ e SC and SV relay s have a high ratio of
drop-out to pick-up (90 to 98%) and are particularly
suitable for fault detector relays. The type SC- 1 and
SV- 1 relays have a lower ratio of drop-out to pick-up.
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Thi s lower ratio may be desirable in some applic ation s ,
and i t mak e s po ssible a plunger pull characteristic
whi ch permits the operation of a latching device. The
latch is combined with the mechanical operation indi­
cator, and p revents further motion of the mo ving con­
tacts after the r el ay has operated.
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CON STRU CTI ON
The types SC , SC- 1 and SV and SV- 1 relays oper­
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ate on the solenoid principle. A U-shaped iron frame ,
mounted on t h e moulded base, supports t h e coil and
serves as the external magnetic path for the coil. The
coil surround s a core and flux shunt. The upp er end
of the core i s threaded and proj ects through the upper
* side of the frame , to w hic h it i s fast ened by a nut . A
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tube threaded
oo
the outside at its lower e nd i s assem­
bled in the core , and t he thre aded e nd e xtends below
the c o re . A Fluorosint® bushi n g , w hi c h i s the lower
@ The Polym e r Corp .
S U P E R S E D E S I . L . 4 1 -766 . 1 F
*D enotes c han ge from s u perseded i s sue.
The construction of the plunger, core and flux
shunt ( which differ in details in the various type s of
these relays) causes the plunger to float in its ener­
gized position , without being held against a stop ,
even when energized much above the pick-up v alue.
Consequently, there i s negligible noi se and the con­
tacts are free from chatter, even on heavy overloads
and in 25 cycle applications.
•
The core, shunt an d plunger construction also
provides the high ratio of drop-out to pickup in the
SC and SV relay s . This ratio i s above 90% for any
pick-up s etting. In the latch type relay s it is neces sary
for the plunger to rise with sufficient force to oper­
ate the l atch positively and to deflect the stationary
contacts suffici ently to prevent their opening, when
the relay is de- energized, due to play in the latch.
It is necessary to have a lower ratio of drop-out to
pick-up in, order to obtain thi s characteristic, and
this lower ratio m ay be d esirable in some applica­
tions where the latch is not required. The plunger
E FFECTIVE FE BRUARY 1 973
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_
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TY P ES SC, SC- 1 , SV AN D SV- 1 R EL A Y S
0¥£1CI.IIlUT UI I T
COII TACTS E I TriER
14AII:E 1 IIIUK, OA
2 MAKE Oil 2 iiiUK
AS REQUIRED -�
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l,rtfttrna/ Wiring of thtt R ttlays In Thtt Small Gl ass
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FROIIT V l lW
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·---CKASSIS OI'UAlU
iltOI U i l h• U I JC"
IOU: COIL TA"ED
FOl 1 TO 2li lA flO
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F i g. 2.
182A854
l ntttrnol Sch ttmatic of thtt Sin gle U n i t Typtt SC or
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Fig.
lEO WOLf
JEST SWI TCH
ClMAE.II T TEST .lACK
SC- 1 Rttlay In Th tt Typtt F T 2 1 Con.
Castt.
The moving contacts are double-faced so that they
can be " m ak e " or " break" and are connected to the
base terminal s by fl exible l e ads. All contacts are
pure silver. The contacts will carry 5 amperes con­
tinuously. and will interrupt 5 amp eres at 1 1 5 volts
A-C, or 1 ampere at 1 25 volts D-C .
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floats in its operated po sition j u st as in the SC and
SV rel ay s . The drop-out ratio varies somewhat for
different shunt positions, but is constant for any one
setting.
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The shunt is held in any desired po sition by p r e s­
sure from a curved arm m ade of sheet spring steel,
which is fastened to the bottom of the coil frame at
the rear of the shunt. This spring arm is shaped to
extend around the shunt to the front of the r el ay , and
in its no rmal position it exerts sufficient pressure
against the shunt to p revent any creeping of the shunt
or unde sired change of s etting. The front end of the
spring arm has a bent-over tab on which thumb-pressure
m ay be applied to move the arm out of contact with
the shunt w hile the position of the latter is being
changed.
T h e m echanical operation indicator s used o n
thes e relays a r e shockproof, a n d c an be used to in­
dicate on the up strok e or down strok e o f the plunger.
The indicator is reset by pulling out the knurled stud
which proj e cts through the cover nut. The indicator
should be reset after e ac h relay operation because
otherwise there may be a o n e o r two percent decrease
in the op erating v alue of the relay . The operation in­
dicator is assembled at the factory to indicate on the
the bas e , as a safeguard against loo sening of the
screen turned around to compl ete the assembly .
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minal inserts. Lock-washers are assembled inside the
moulded terminal bushings between the inserts and
up strok e of the plunger, but by removing the two
mounting screws which fasten the indicator to the
main fram e , turning the indicator brack et around and
at the s am e tim e swinging th e indicator flag 1 8 0°
about its shaft, the indicator can be s et to indicat e
on t h e down strok e of t h e plunger. T h e rivet w eight
must be removed from the indicator flag an d the l atch
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The stationary contacts are assembled on slotted
brack ets. The se are held in position on the base by
filister-head screws which are threaded into the ter­
screws. By rotating the brack et on its mounting screw
In certain applications , an e xtrem ely wide r ange
be m ade either normally open or norm ally closed. The
moving contacts are mounted on a Micarta insulation
plate whi ch is secured to the threaded end o f the plun­
ger shaft by a nut. The front edge of this i n sulation
plate operates the indicator. The r ear portion o f the
of current adj ustment i s desirable , and c ertain styles
of SC and SC- 1 relays have been provided with tapp ed
coils to meet this requirement. The coil t ap s are brought
out to a tap block mounted on the lower end of the re­
lay frame or on the relay sub-base, depending on the
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and moving it along its slot, the contact assembly can
plate i s slotted and a post screwed to the frame passes
through thi s slot to prev ent the plate from rotating.
2
type o f case used. The connector plate o n the tap
block is m arked with the minimum pick-up v alue o f
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TY P ES SC, SC- 1 , SV AN D SV- 1 R EL A Y S _____________________
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IWTEIIIIAL SCNfliAT I C
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COIHACTS • £HnfR
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AS IUQUIIIEO
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(FIIOII T W I E • )
TEbiiiiAL
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SttORT I II Q SIITCK
IOJ£: COH.I TAPNI
TO 21.1UII
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Fig. 3.
In te rn al Schematic o f the Do uble Unit Type SC or
Fig. 4.
-1
1
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· aEO IINIOLE
- TEST SWITCn
TEitMI"AL
FROIIT Y I IW
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182A855
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AS KEIJUillED
182A856
I n te rn al S chemati c of the Singl e Unit Type S V or
S V- 1 R elay in the Type F T2 1 Case.
SC- 1 Relay i n the Type FT2 1 Case.
should not be di sturbed after rec eipt by the custorn P r .
t h e adj ustments h ave b een changed, t h e relay taken
apart for repai r s , o r if it i s desired to check the ad­
j u stments at regular m ai nt enance period s , th e in­
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each tap , and the shunt is adj u st ed in the usual man­
ner to obtain any pick-up setting between tap s . The
scale plate is not c alibrated fo r the relay s with tap·
p ed coils , as there is not sufficient space for marking
a scal e for each tap. However, the scale plate i s sup­
plied in order that a customer m ay mark on it the in­
dividu al rel ay setting or s ettings if desired.
I N STALLATI ON
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The rel ays should be mounted on switchboard
panel s or their equi valent in a lo cation free from dirt,
moi sture, excessive vibration, and h e at . Mount the
relay vertically by mean s of the fou r mounting hol e s
o n t h e fl ange for semi-flush mounting or b y means of
the rear mounting stud or studs for proj ection mou nt­
ing. Either a mounting stud or the mounting screws
may be utilized for grounding the relay . The el ectri­
cal connections m ay be made directly to the terminal s
by mean s o f screws for steel panel mounting o r to the
term inal studs furnished with the relay for thick panel
mo unting. The ter minal studs m ay be easily remo ved
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
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For detailed F'T case information refer to
4 1 -076.
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ADJ U STM ENTS
AN D
I.L.
MAI N TENANCE
The proper adj u stments to insure correct opera­
tion of this r el ay hav e been made at the factory and
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struction s below should be followed.
All contacts should be cl eaned p eriodic ally. A
contact burnisher S!tl8 2A8 36H 0 1 i s recommended fo r
this purpo se. The u s e of abrasive material for cl ean­
ing co ntacts is not recomm end ed, because of the dan­
ger of embedding small particl es in the face of th e
soft silver and thus impairing the contact.
Several factors may affect the drop-out ratio of
the relay . Whatever affects the ratio does so becau s e
either t h e drop-out or pick-up o r both are affected.
Obviously, incorrect assem bly o r interchange o f part s ,
such a s the u s e of t h e S C plunger with the S V core
tube, will alter the electri cal characteristics. However ,
the factor most likely to be encountered in service i s
friction. This m ay b e d u e t o dirt o r foreign material
between the plunger shaft and its bearings . to ex­
cessive pressure o f the indicator screen on th e indi­
cator , o r to l e ad s so mis- shaped that they tend to
rotate or tilt the moving contact insulation plate
with appreciable force.
I n order to remove the plunger and shaft assembl y .
it i s necessary t o remove t h e setscrew and n u t a t the
top o f the shaft. The spool- shaped bushing assembl ed
on the upper end of the plunger shaft has a portion of
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TY P E S SC, SC- 1 , SV AN D SV- 1 R EL AY S
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toll "'' - [I liiU
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COIITACTS - EITIUII
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182A857
I n ternal Schematic of th e Double Unit Typ e S V o r
SV- ) Relay i n th e Type FT32 Case.
Fig. 6.
tiASI II INIA•t
IIIIT I AI
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JUT IWITCM
--et.tlllwt nat ...,
T£111111111.
183A l9 3
I n ternal Schemati c o f the Three U n i t Type SC o r
SC- 1 Relay i n the Typ e F T32 Case.
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F i g. S.
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TYPE Of
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TOf I.., II. '.'"1
(fi•T Hat)
ed at intervals of approximately two years. When re­
placing the lower bearing and the split sleeves, the
shorter sleeve ( assembled below the bearing) should
be pushed in until it is flu s h with the end o f the
threaded tube.
The shaft and plunger assembly should be hand­
led carefully to avoid bending the shaft or damaging
the bearing surface s . The shaft should never be grip­
ped on its upper bearing surfac e , below the spool­
shaped bushing, when loosening the nut and s etscrew,
as this would almost c ertainly damage the bearing
surface. The s haft bearing surfaces s hould not be
latch-type relay s , the screen should b e so located
that good contact i s still obtained when the relay is
de- energized. The pres sure of the screen against the
indicator may be adj usted by bending the screen be­
tween its lower end and the large elongated hole.
This pressure should be such that the indicator will
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its center section machined off so that the shaft i s
expos ed a t this point and can b e prevented from turn­
ing by gripp ing shaft and bushing with a pair of long­
nose pliers while removing the set screw and nut .
Then by pressing down with the fingers on the upp er
end of the shaft, the lower split sleeve which retai n s
t h e l o w e r bearing will be forced o u t of the thread e d
tube , the bearing will drop o u t freely, a n d t h e upp er
split sleeve will be forced out far enough to p e rmit
grasping it fo r removal. The shaft and plunger as­
sembly then can be removed.
cleaned or polished with any abrasive material, as
the abrasive p articles might become imbedded in the
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shaft and cause difficulty later. The plunger shaft
and bearings may be cleaned by wiping them care­
fully with a clean , lint-less cloth. This may be mois­
tened with benzene or some other cleaning solvent if
necessary. U s e no lubricant on the plunger shaft or
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bearings when re-assembling the r elay , s ince this
will eventu ally become gummy and prevent proper
operatio n . It is recommended that the shaft b e clean-
4
The mounting holes in the operation indicator
screen are slotted so that its position c an be adj usted.
For relays in which the moving contacts are not latch­
ed in the operat ed position , the screen should be so
located that the indic ator positively enters the
screen opening when the contacts barely touch. For
be held at any further position to which it is moved
after entering the screen opening. However, the mini­
mum amount of pressure necessary to obtain this ad­
j ustment should not be exceeded appreci ably , since
the pick-up valu e, and cons equ ently the rati o , will
be affected. The purpose of this pressure is to elim­
inate indicator rattle which might otherwi se o ccur
und e r certain energized conditions.
The moving contact l eads p ass through insulation
sleeves assembled on the shank s o f the terminal clips
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I.L. 4 1 ·766. 1 G
TYP E S SC, SC- 1 , SV A N D SV- 1 R EL AY S
CHARACTERISTICS OF TYPES SC AND SC- 1 RELAYS
Frequency
Type
V . A . at
5 Amp s .
6 0 Cycles
. 5- 2
99
225
1.5
28
1-4
65
3
2-8
6.9
19
6
12
1.5
4- 1 6
5
1 0-40
25
.24
.7
. 07
20-80
40
. 16
.03
40- 1 6 0
40
. 05
4- 1 0 0 *
1 . 7-0 . 6-0 . 1 8
1 0- 1 5-20
5- 1-0 . 2
. 5- 2
100
1.5
210
24
1-4
3
60
6
2-8
16
6
1.5
4- 1 6
12
5
. 25
1 0-40
25
.65
. 07
20-80
. 16
40
.03
40- 1 6 0
40
.05
4- 1 0 0 *
1 0- 1 5-20
1 . 7-0 . 6-0 . 1 8
5- 1- 0 . 2
* Coil has taps on which minimum pickups are 10 and 30 amperes.
DC ,
DC ,
DC,
DC ,
DC ,
DC ,
DC ,
DC ,
DC,
DC,
DC ,
DC ,
DC ,
DC ,
DC,
DC,
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
hz.
hz .
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
hz.
h z.
hz.
hz.
Dropout
Ratio-AC
Dropout
Ratio-De
9 0-98%
9 0-98%
9 0- 98%
9 0-98%
90-98%
9 0- 98%
9 0- 9 8%
90-98%
3 5- 6 0%
3 5-60%
35-60%
3 5-60%
3 5-60%
3 5-60%
35-60%
3 5- 6 0%
65-80%
6 5-80%
65-80%
65- 8 0%
6 5- 80%
6 5-80%
65-80%
65-80%
25-40%
25-40%
2 5-40%
2 5-40%
2 5- 40%
2 5- 40%
25-40%
25-40%
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SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
SC- 1
Watts
5 Amp s.
60 Cycles
an
sc
sc
sc
sc
sc
sc
sc
sc
Range of
Adj u stment Max. Amp s.
Amps.
Continuou s
Watts at
1 1 5 V . AC
( 1 2 5 V . for DC)
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16
160
320
640
180
200
150
300
16
1 60
320
640
1 80
200
150
300
60
60
60
60
50
25
DC
DC
V . A . at
1 1 5 v.
3.4
7.3
2.8
1 .5
4.8
6. 1
2.5
4.1
8.5
3.5
1.4
4.8
7.1
3.2
Dropo ut
Ratio
90-98%
9 Q-98%
9 0-98%
9 0-98%
90-98%
9 0-98%
65-80%
6 5-80%
40-80%
40-80%
40-80%
40-80%
40-80%
40- 80%
25-40%
25-40%
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SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
SV- 1
7- 1 6
7 0- 1 60
1 40-320
280-640
7 0- 1 60
7 0- 1 60
5 0- 1 5 0
1 00-300
7- 1 6
70- 160
1 40- 320
280-640
70- 1 6 0
7 0- 1 6 0
50- 1 5 0
1 00-300
60
60
60
60
50
25
DC
DC
Max. Volts
Continuous
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sv
sv
sv
sv
sv
sv
sv
sv
sv: 1
Range of
Adj ustment
Volts
ca
Type
Frequency
(Cycles)
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CHARACTERISTICS OF SV AND SV- 1 REL AYS
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NOTES:--Standard current relay s are calibrated on 60 cycl e s . This calibration is app roximately correct
for 25 cycl e and DC application s , but there will be discrepancies of 1 0% to 1 5% at some points of s c al C' .
Val u e s of watts and volt- amperes in the tabl es are average for vario us plunger and shunt po sition.
For the SC relay , volt-amperes for pickup at minimum setting are approximately 3 . 4 and 1 . 4 for 60
and 2 5 cycles. Watts at minimum setting are approximately 1 . 0 , .65 and .57 for 60 cycl e s , 25 cycles and
DC resp e ctively. Multiply values by 16 for approximate burdens at maximum settin g.
.E
For the SC- 1 relay , volt- amp eres for pickup at minimum s etting are approximately 3 . 5 and 1 . 3 for 60
and 2 5 cycles. Watts at minimum settings are 1 . 3 , . 7 and . 57 for 60 cycles, 25 cycles and d- e resp ectively
Multiply values by 16 for approximat e burdens at maximum setting.
* The V . A. burdens of the SC and SC- 1 relays at 3, 1 0 and 20 time s minimum pickup current are approx­
imately 3 1 , 240 and 770 V . A. resp ectively.
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Dropout r atio varies somewhat with pick up adj ustment but will be approximately constant for any
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given pickup setting. Limits in tables include variable s such as friction and other individual relay vari a­
tions.
M aximum continuous volts given for the SV and SV- 1 relays for A-C are for the relay set for minimum
pickup. With the relay set for maximum pick up the continuous voltag e can be increased 10 to 20%.
5
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TY P E S SC, SC- 1 , SV AN D SV- 1 R EL A Y S
_
___
_
_
_
_
_
_
_
_
_
_
_
_
_
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_
_
_
Curve
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TOP LEfT MAIID U II I T
(FIIOIH Yl[lt)
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Fig. 8.
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which are attached to the base terminal s. These
sleeves ar e notched at their upper ends, and the not­
ches are tow ard the c enter of the relay. The leads are
bent at approximately a right angle where they pass
out through the notche s , which aids in preventing them
from coming into contact with the stationary contact
brackets. F'igure 1 1 sho w s p rop erly coiled and assem­
bled moving contact leads.
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Although the moving contact l e ads are very flexi­
ble , if the lead s have been pulled out of their origin al
shape by handling they may exert sufficient side pres­
sure on the shaft bearin g or twi sting force against
the guide post to c ause appreciable friction and w ear.
If this condition continues for a long period of time ,
the resulting wear may affect the relay c alibration o r
or t h e dropout ratio noticeably. I n extreme cases the
wear may progress to a degree which m ay occasionally
cause failure of the plunger to drop down when the re­
lay is de- energized.
150
ZOO
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Perctnt of Piclr-up Settinf!. on SVor SV.I Relay and on SC
or SC I Relay Ustd on D.C.
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I n t e rn al Schem ati c o f the Three Unit Typ e SV o r
S V.. J Relay i n the Typ e F T32 Cose.
100
zoo
·
--
:k: SVand V-1 rlrW on cr,c
Hf!X. Stt�m� SC and SC-I J/Jays on 6
.""(
. . : �r?'��tttm
.
, 11ax. Settin
l -mt �Jill ;!?. Hifl. Stttin !:1J 1
·
-
I'Prctnt of Pick-up Sttlinv on SC or SC-I Relay (60 Cycles)
183Al92
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TEST SWITtN
F i g. 7.
' S II. S V-t, SC and SC-I Rt ays on D.C.
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TOP I I iiiT MAIO U II I T
(fiOII T VIEW)
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COII U.C:TS - E I TMU
MAICE OI UUI U
IIEQI.IIIED
1432 85
Typ i cal Tim e Curves lor the Typ e s SC and S V
_
Relay s (U sl n g Fiux Shunt for Pick -up Adjustment.)
collar under the insulation plate after rai sin g the
plunger manually. With the plunger rai sed , th e insul­
ation plate sheuld be o scillated slightly in a horizon­
tal plane by twisting it horizontally and releasin g it.
If in several trials the plate comes to rest with the
center line of the contacts app ro ximately paral l el to
the base and with its mounting hole fai rly well center­
ed with the end of the shaft, if the plate does not tip
appreciably , and if the l e ad s have a safe clear ance to
the stationary contact brackets, the l eads are properly
shaped.
I f this check shows that r e- sh aping is necessary,
it m ay b e possible to o btain sufficient cor rection by
bending the l e ad s sharply where they emerge from the
insulation sleeves. One o r two p ai r s o f tweezers ate
tools for re- sh aping the l e ads. If it is necess ary to
re-coil the l e ads, they should be wound around a rod
having a diameter of approximately 5/ 32" . The coils
then should be stretched out j u st enough to avoid side
pull or twisting force o n the plunger assembly.
Correct shaping of the l eads i s not difficult, and
I n all relays except the SV- 1 relay for A- C , if the
po st and the nut at the top of the shaft. The plunger
should be held i n the rai sed po sition, either by e ner­
gizing the relay or by pressing lightly against the
stationary contacts are ass embled so that they clo s e
when t h e relay is energized, they should be located
so that they barely touch the moving contacts when
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they m ay be checked readily by removing the guide
6
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I.L. 41·766.1G
---
---- ----
77-D- 4 18
O u tline & D ri lling P l an fo r Single Unit R elays in
Small G l a s s Projection Case.
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Fig. 9.
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TY P E S SC, SC- 1 , SV AN D S V- 1 R E L AY S
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the l atter are 5 / 3 2 " above the de-en ergized position .
The moving contact s can be held in this position
while the adj ustment i s being made by ins erting a
5/32" spacer between the shaft coll ar and th e top o f
F i g. 10.
View of Typ e SC R el ay Showing Correct Sh ap i n g
o f Movi n g Contact L e ads.
means of altering the ratio of dropout to pickup.
REN EWAL
PA RTS
Repair workcan be do n e most s a ti s f a cto r i l y at t h e
factory. However, interchangeable p arts c an be fur­
nished to the cu stomers who are equipped for doing
r epair work . When ordering part s , always give the com­
plete nameplate data.
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t h e core. Thi s dimension should be 3/ 1 6 " on t h e SV1 rel ay for A-C . Both contacts should touch at the
same time when the plun ger i s raised . When the plun­
is moved upward against its stop, there should be a
slight deflection of the stationary contact stop sprin g s ,
but t h i s should not exceed 1 / 3 2 " . W h e n t h e station ary
contacts are reversed so that they are closed when
the relay i s de-energized, they should be located so
that they j us t touch the moving contacts when the
l atter are 1/3 2' ' above the de-energized position . On
some relays it may be found that when the contacts
are used in this position the relay may operate at
values a few p ercent below the scal e markings. The
adj ustments spe cified for the stationary contacts are
importan t . Failure to observe them may cau s e improp er
relay operation, either directly or after a period of
service. Contact position should not be used as a
7
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TY P E S SC, SC- 1 , SV AN D SV- 1 R E LAYS
__
_
_
_
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_
_
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_
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_
I NTERNAL SCH EMAT I C
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CONTACT
FRONT Y I EW
Internal Sc hem atic for R e lays in Front Conne cted
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CtURAMCE . HOLE
FOR . 1 90-32 SCREW
. 1 90
TERM I NA L
HARDWARE
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TERM I NUS
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Case.
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Fig. 12.
Outline
1-+---- 5 . 3 1 2
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and D r i l l i n g P l an for R e lays in Front Connected C ase.
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66.
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TY P ES SC, SC- 1, SV AN D SV- 1 R E L AY S ______________________
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MOUITIM HTAI LI
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A. 10 IIOI.ES
01 CUT OUT
PMEL HI LLIII 01 CI1IUT FOa
PIIN ECTIOI MTI•
(FDT YIEW)
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57-D-7901
F ig. 13
Outline and Drilling Plan for Single and Double Unit Relays in the Type FT21 Case.
9
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• · DI A,, MOLES FOR
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T Y P E S SC, SC- 1 , SV AN D SV- 1 R EL AY S
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PAIEL CUTOUT I DRI LLIIIG
FOR SBU FLUSH MTG.
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TEIIMIIIAL AID
MOUIIT IIIG DElli LS
f'MEL OR4LLIIG OR
CUTOUT FOil PIO.IECTIIIII MTa.
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57- D-7903
F i g . 14.
O utline and Drilling Plan for Three Unit R elays in the Type F T32 Case.
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WESTI N G H O U S E
R E LAY- I N ST R U M E NT
ELECTRIC
D IV I S I O N
CO RPO RAT I O N
N EWAR K , N . J .
Printed in U . S . A .