Product Data Sheet
SD 1503-2E05
November 2009
Power controlled LPU system
Product Data Sheet
SD 1503-2E05
November 2009
Power control LPU system
Description
Power controlled LPU has internal control ensuring
stop of electrical motor, when the valve has reached
end position or if the valve is locked in intermediate
positions.
LPU-S can maintain an open position on a spring
actuator by restarting the pump in case of a pressure
loss.
The control of the units in the system is carried out
with hardwire in star connection from a relay- or PLC
substation.
Each LPU is connected to a control console with one
cable only and is controlled only by the operating
voltage.
In power controlled versions the valve position
signals (switches or 4-20 mA loop powered) are led
directly to the substation.
Position indication signals
The position indicator is built into the pump block
with internal wiring from position indicator to the
circuit board mounted in the LPU electrical encapsulation (except for KFR).
Potentiometer for analogue position indication, or 2
micro-switches for end-position indication are available.
Position indication signal:
Data sheet
-
-
-
Continuous:
Power control LPU system
ON/OFF:
Cable:
Continuous:
For analogue position indication signals, two wires are required.
For ON/OFF indication signal, one common wire and one wire each for open and for closed signal are required.
ON/OFF switches are limited to 2.5 VA resistive load. Please refer to separate data sheet.
4-20mA 24V DC
2 wire transmitter
Max 2.5 VA switches
Min. 5 x 1.5 mm
Min. 6 xout
1.5with
mm hardwire in star connection
Power controlled LPU has internalON/OFF:
control
carried
Damcos recommends standard cable, 7 x 1.5 mm²
ensuring stop of electrical motor, when the
from a relay- or PLC substation.
valve has reached end position or if the valve
Each LPU is connected to a control console
Cable diameter:
is locked in intermediate positions.ø 12.5 - 20.5 mmwith one cable only and is controlled only by
LPU-S can maintain an open position on a
the operating voltage.
spring actuator by restarting the pump in case In power controlled versions the valve position
of a pressure loss.
signals (switches or 4-20 mA loop powered)
The control of the units in the system is
are led directly to the substation.
Description:
Electrical specification
This
unit has to be controlled
directly
230Vdirectly
AC, with
This unit has
to be with
controlled
Electrical
specification:
230V AC, 50 or 60 Hz.
50 or 60 Hz.
2 containing motor
A cable
e.g. 7 x motor
1,5 mmcontrol
A cable e.g. 7 x 1,5 mm
containing
and
control
and position
indicator
signal is drawn
position indicator signal
is drawn
from the
control
cabinet to each LPU from
unit.the control cabinet to each LPU unit.
Circuit board wiring diagram for power controlled LPU
Position indication
signals:
2
The position indicator is built into the pump
block with internal wiring from position
indicator to the circuit board mounted in the
LPU electrical encapsulation (except for
KFR).
Potentiometer for analogue position indication, or 2 micro-switches for end-position
indication are available.
-
For analogue position indication signals,
two wires are required.
For ON/OFF indication signal, one
common wire and one wire each for open
and for closed signal are required.
ON/OFF switches are limited to 2.5 VA
resistive load. Please refer to separate
data sheet.
Product Data Sheet
SD 1503-2E05
November 2009
Data sheet
Power control LPU system
Power controled LPU system
Operation
LPU-S
Opening: The LPU-S requires only 2 wires for
Operation LPU-S:
tions, the solenoid valve may be connected and controlled separately.
If the control
is built
up so that the the soleClosing:
When system
the LPU
is de-energized,
LPU
“open”
terminal
is
energized
whennoid valve opens and the oil flow from
actuator to
ever the valve is to be open. An interruptank, which causes that the spring closing actuator
tion in the power supply will cause the
closes
valve.
This function
may
used as failmotor stops. The valve is kept open by a solenoid
LPUthe
motor
to restart
as soon as
thebe
power
safe.is reconnected. This will be avoided by
valve, preventing-theIfoil
from internal
flowing leakage
back into
thetime
a minor
over
tank.
causes the pressure to fall below the preset
defining the system so that only the
the control
system
is builtIfup
that the LPU pressure switch level, the pump will restart - If solenoid
valve
is energized.
theso
valve
run forover
7 sec.,
keeping
leaves terminal
the required
position, the
control the valve “open”
is energized
whenever
- If a minor internal and
leakage
timethus
causes
theup
the
pressure.
This does
not affect
the position
must readjust
the valvein
position
by sup
issystem
to be open.
An interruption
the power
pressure to fall below
the preset
pressure
switch
re-connecting
thepower
supply
to
the
of
the
valve.
ply will cause the LPU motor to restart as soon as level, the pump will restart and run for 7 sec., thus - If you want to obtain intermediate posi“open”
terminal.
the
power
is reconnected. This will be avoided
ON/OFF-operation. When the LPU-S is
energized,
it opens
valve,for
runs for 7 sec.
Opening: The LPU-S
requires
onlythe
2 wires
extra, and then the motor stops. The valve is
ON/OFF-operation. When the LPU-S is energized, it
kept open by a solenoid valve, preventing the
opens the valve, runs
forflowing
7 sec.back
extra,
and
oil from
into
thethen
tank.the
keeping up the pressure. This does not affect the position of the valve.
If you want to obtain intermediate positions, the the LPU
is de-energized,
solenoid valve Closing
may be: When
connected
and
controlled the
solenoid
valve
opens
and
the
oil flow from
separately.
actuator to tank, which causes that the spring
closing actuator closes the valve. This
function may be used as fail-safe.
by defining the system so that only the solenoid valve is energized. If the valve leaves the required position, the control system must readjust the valve position by re-connecting, the power supply to the “open” terminal.
Electrical LPU-S
The motor/pump The
starts
directly bystarts
means
of power
motor/pump
directly
by means of
Electrical LPU-S:
on “open” terminal.
power on “open” terminal.
Themotor
timer stops
motor ifhas
the expressure has
The timer stops the
if the the
pressure
exceeded
pressure
switch
setThis
point for 7
ceeded the pressure
switchthe
set
point for
7 sec.
sec.
This
circuit
ensures
high
safety
on the
circuit ensures high safety on the LPU. Furthermore,
LPU.
Furthermore,
a
thermal
safety
is
built
a thermal safety is built into the motor.
into the motor.
When the valve is open and the pressure drops beWhen the valve is open and the pressure
low set point, there
is an
automatic
restart.
drops
below
set point,
there is an automatic
The solenoid valve
will keep the unit in open position
restart.
as long as the unit
has
powervalve
on. will keep the unit in open
The
solenoid
position as long as the unit has power on.
Operation LPU-D
Opening / Closing: LPU-D requires only 3 wires to
operate the valve. When the motor is energized, it
opens or closes the valve, dependent on the activation of the solenoid valve, runs for a further 7 sec.,
and then stops. The valve is locked in position by a
double pilot operated check valve, preventing the oil
from flowing back into the tank.
If you wish to obtain intermediate positions, the motor and the solenoid valve are simply de-energized
when the required position has been reached.
Note: To prevent automatic restart after blackout,
Damcos recommends to take away the power for 30
sec. after the valve has reached end position.
3
dependent on the activation of the solenoid
valve, runs for a further 7 sec., and then
stops. The valve is locked in position by a
double pilot operated check valve, preventing
the oil from flowing back into the tank.
If you wish to obtain intermediate positions,
the motor and the solenoid valve are simply
de-energized when the required position has
been reached.
reached end position.
Product Data Sheet
SD 1503-2E05
November 2009
Power control LPU system
The motor/pump starts directly by means of
Electrical LPU-D
Electrical LPU-D:
power on - open or close. If the pressure
exceeds 70 bar for 7 sec. the timer stops the
The motor/pump starts
directly by means of power
motor/pump.
on - open or close. If the
pressure exceeds 70 bar
This circuit ensures a high safety on the LPU.
for 7 sec. the timer stops the motor/pump.
This circuit ensures a high safety on the LPU.
LPU with LED Postion Indicator
The LED Position Indicator in the top cover can be powered
by:
- Directly via the ON/OFF position indicator (com
monly DPI-E), if the signal back to the inputs may be 24VDC respectively 0V.
- From the ON/OFF position indicator outputs in
PD527, with the 0VDC connected to the common anode of the LED.
- From customer specified output.
Under all circumstances, 24VDC power to the LED
must be available in LPU.
Digrams for LPU with LED Postion Indicator
PD527 Controlled power LPU with LED Indication - Option 1
High = 24V
4/5
SD 1503-2E02 Sep. 2002
4
Low = 0V
Product Data Sheet
SD 1503-2E05
November 2009
Power control LPU system
External Controlled power LPU with LED Indication - Option 2
High = 24V
Low = 0V
External Controlled power LPU with LED Indication - Option 3
High = 24V
Low = 0V
5
Product Data Sheet
SD 1503-2E05
November 2009
Power control LPU system
External Controlled power LPU with LED Indication - Option 4
Closed = 0-3% valve pos.
Open = 97-100% Valve pos.
6
Product Data Sheet
SD 1503-2E05
November 2009
Power control LPU system
System layout
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