Electropneumatic
Hot Melt Application Heads
EP 34 / EP 34 S / EP 34 SD
Manual P/N 409 090 A
– English –
NORDSON ENGINEERING GMBH LÜNEBURG GERMANY
Note
This manual applies to the entire series.
Order number
P/N = Order number for Nordson products
Notice
This is a Nordson Corporation publication which is protected by copyright. Original copyright date 1998.
No part of this document may be photocopied, reproduced, or translated to another language without the prior
written consent of Nordson Corporation. The information contained in this publication is subject to change without
notice.
Trademarks
AccuJet, AquaGuard, Asymtek, Automove, Autotech, Blue Box, CF, CanWorks, Century, Clean Coat, CleanSleeve, CleanSpray, Compumelt, Control Coat,
Cross-Cut, Cyclo-Kinetic, Dispensejet, DispenseMate, Durafiber, Durasystem, Easy Coat, Easymove Plus, Econo-Coat, EPREG, ETI, Excel 2000, Flex-O-Coat,
FlexiCoat, Flexi-Spray, Flow Sentry, Fluidmove, FoamMelt, FoamMix, Helix, Horizon, Hose Mole, Hot Shot, Hot Stitch, Isocoil, Isocore, Iso-Flo, JR, KB30, Little Squirt,
Magnastatic, MEG, Meltex, MicroSet, Millenium, Mini Squirt, Moist-Cure, Mountaingate, MultiScan, Nordson, OmniScan, Opticoat, Package of Values, Pattern View,
PluraFoam, Porous Coat, PowderGrid, Powderware, Pro-Flo, ProLink, Pro-Meter, Pro-Stream, PRX, RBX, Rhino, S. design stylized, Saturn, SC5, Select Charge,
Select Coat, Select Cure, Slautterback, Smart-Coat, Spray Squirt, Spraymelt, Super Squirt, Sure Coat, System Sentry, Tela-Therm, Trends, Tribomatic, UniScan,
UpTime, Veritec, Versa-Coat, Versa-Screen, Versa-Spray, Watermark, When you expect more. are registered trademarks – – of Nordson Corporation.
ATS, Aerocharge, Auto-Flo, AutoScan, BetterBook, Chameleon, CanNeck, Check Mate, COLORMAX, Control Weave, Controlled Fiberization, CPX, E-Nordson,
EasyClean, Eclipse, Equi=Bead, Fillmaster, Gluie, Ink-Dot, Iso-Flex, Kinetix, Maxima, MicroFin, Minimeter, Multifil, OptiMix, PluraMix, Primarc, Prism, Process Sentry,
PurTech, Pulse Spray, Seal Sentry, Select Series, Sensomatic, Shaftshield, Spectral, Spectrum, Sure Brand, Swirl Coat, Vista, Walcom, 2 Rings (Design) are
trademarks – T – of Nordson Corporation.
Designations and trademarks stated in this document may be brands that, when used by third parties for their own purposes,
could lead to violation of the owners’ rights.
COV_EN_409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Table of Contents
I
Table of Contents
Safety
Decription
.................................................................
1. Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unintended Use – Examples – . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Residual Risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Manual References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Application Head EP 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Application Head EP 34 S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Application Head EP 34 SD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ID Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation
1. Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Exhausting Adhesive Fumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Laying Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Application Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Triggering Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7. Pneumatic Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compressed Air Filter (Accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heated Air Assembly (Accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting Compressed Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting Spray Air (EP 34 S and EP 34 SD) . . . . . . . . . . . . . . 10
Lubricating or Not Lubricating the Control Air . . . . . . . . . . . . . . . . 10
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
II
Table of Contents
Installation (contd.)
Operation with Non-Lubricated Control Air . . . . . . . . . . . . . . . . . . 11
Operation with Lubricated Control Air . . . . . . . . . . . . . . . . . . . . . . . 11
8. Installing Heated Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Disconnecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Relieving Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Second Open–jawed Wrench . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation
1. Triggering Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2. Setting Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3. Adjusting Control Air Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum Control Air Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Setting Adhesive Application Quantity . . . . . . . . . . . . . . . . . . . . . . . . . 14
Stem Stroke Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5. Adjusting Spray Pattern (EP 34 S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6. Adjusting Spray Pattern (EP 34 SD) . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7. Settings Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Maintenance
1. Relieving Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2. Daily Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Inspection for External Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
External Cleaning of Application Head . . . . . . . . . . . . . . . . . . . . . . 19
Release–coated Application Heads . . . . . . . . . . . . . . . . . . . . . . 19
External Cleaning of Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3. Regular Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Changing Type of Adhesive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4. Maintenance Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Table of Contents
Repair/Retrofitting
III
1. Retrofitting Application Head with New Control Modules . . . . . . . . . 22
2. Replacing Single Control Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3. Removing and Installing Control Module . . . . . . . . . . . . . . . . . . . . . . 23
Removing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting
1. Troubleshooting Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Specifications
1. General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2. Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
IV
Table of Contents
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
1
Safety
WARNING: Please follow the safety regulations enclosed as a
separate document and the specific safety notes in the entire
documentation.
Decription
1. Intended Use
EP 34 hot melt application heads – hereafter also referred to as
application heads – may only be used for the application of hot melt
materials.
Any other use is considered to be unintended. Nordson will not be liable
for personal injury or property damage resulting from unintended use.
Intended use also includes the observance of Nordson safety
instructions. Nordson recommends obtaining detailed information about
the materials to be used.
Unintended Use – Examples –
The application heads may not be used under the following conditions:
S In defective condition
S When modifications or changes have been made by the customer
S In a potentially explosive atmosphere
S When hot melt materials not suitable for the unit are used
S When the values stated under Specifications are not complied with.
The application heads may not be used to process the following
materials:
S Polyurethane hot melt material (PUR)
S Explosive and flammable materials
S Erosive and corrosive materials
S Food products.
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
2
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
2. Residual Risks
The application head is designed to protect operating personnel from
possible risks. However, some residual risks can not be avoided.
Personnel must consider the following:
S Risk of burns on the hot application head: from hot adhesive, when
replacing filter cartridges (option) and when making adjustments.
S Inhalation of potentially hazardous hot melt material vapors.
3. Manual References
This manual applies to the entire series.
The position numbers in the illustrations do not correspond to the position
numbers in the technical drawings and the spare parts lists.
The illustrations show only the essential unit components. All other
components and details can be found in the enclosed technical drawings
(Refer to Parts List).
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
3
4. Illustrations
Figure 1 shows the essential components of the application head
EP 34.
Application Head EP 34
1
2
10
3
9
8
7
6
5
4
EPAH324L199B0698
Fig. 1
1. Solenoid valve
2. Control air connection
E 1998 Nordson Corporation
All rights reserved
3.
4.
5.
6.
Power cable
Hose connection (adhesive)
Bracket
Body
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
7.
8.
9.
10.
Control module
Leakage hole
Nozzle EP 34
Stem stroke adjustment
P/N 409090A
4
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
4. Illustrations (contd.)
Figure 2 shows the essential components of the application head
EP 34 S.
Application Head EP 34 S
1
2
3
12
11
4
10
9
8
7
6
5
EPAH325L199A1297
Fig. 2
1. Solenoid valve
2. Control air connection
3. Spray air connection
P/N 409090A
4.
5.
6.
7.
Power cable
Hose connection (adhesive)
Bracket
Body
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
8.
9.
10.
11.
12.
Control module
Leakage hole
Nozzle EP 34 S
Stem stroke adjustment
Air adjustment screw spray air
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
5
Figure 3 shows the essential components of the application head
EP 34 SD.
Application Head EP 34 SD
1
”I”
”A”
12
13
2
3
11
4
10
9
8
7
6
5
EPAH326L199A1297
Fig. 3
1. Solenoid valve
2. Control air connection
3. Spray air connection
E 1998 Nordson Corporation
All rights reserved
4.
5.
6.
7.
Power cable
Hose connection (adhesive)
Bracket
Body
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
8.
9.
10.
11.
12.
Control module
Leakage hole
Nozzle EP 34 SD
Stem stroke adjustment
Air adjustment screw
o(uter) spray air
13. Air adjustment screw
i(nner) spray air
P/N 409090A
6
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
The EP 34 application heads are used to apply adhesives as bead
application (EP 34), spiral shaped (EP 34 S) or atomization application
(EP 34 SD).
5. Functioning
The control module and body are separate from one another. This
enables temperatures of 200 °C / 392 °F or 260 °C / 500 °F (high
temperature or T version) to be maintained over longer periods of time.
The application head is heated with electric heater cartridges. The
temperature is monitored continuously by temperature sensors and
controlled by an electronic temperature controller located in the electrical
cabinet of the application unit.
The patented spray method (EP 34 S, EP 34 SD) mixes adhesive with
spray air inside of the spray nozzle.
ID Plate
R
Nordson Engineering GmbH
D 21337 Lüneburg – Germany
V
1. box
Type of application head
2. box
Nordson order number
3. box
Serial number
4. box
Operating voltage
V = Volt
5. box
Power consumption
W = Watt
W
CFSY084S0501095
Fig. 4
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
7
Installation
WARNING: Allow only qualified personnel to perform the
following tasks. Observe and follow the safety instructions in
this document and all other related documentation.
1. Unpacking
Unpack carefully, then check for transport damage. Reuse packaging
materials or dispose of according to local regulations.
2. Transport
NOTE: The hot melt application head is a high precision, valuable part.
Handle very carefully! Protect the nozzle from damage.
3. Installation
Install the application head in the appropriate place in the coating
machine. Observe the following:
S Do not operate in an explosive atmosphere
S Protect from humidity, vibrations, dust and drafts
S Ensure easy access to parts relevant to maintenance and operation
S Protect nozzle from damage.
Exhausting Adhesive Fumes
Ensure that adhesive fumes do not exceed the prescribed limits. Suction
off adhesive fumes. Ensure sufficient ventilation of the surroundings.
4. Storage
Do not store outside! Protect from humidity and dust. Do not lay unit on
the nozzle. Protect the nozzle from damage.
5. Disposal
When your Nordson product has exhausted its purpose and/or is no
longer needed, dispose of it according to local regulations.
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
8
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
6. Electrical Connection
WARNING: Risk of electrical shock. Failure to observe may
result in personal injury, death, or equipment damage.
Laying Cable
WARNING: Ensure that cables do not touch rotating and/or hot
parts. Do not pinch cables. Check regularly for damage.
Replace damaged cables immediately!
Connecting Application Head
WARNING: Only operate with the voltage shown on the
ID plate.
1. Connect power cable with plug (1) to the socket on the heated hose.
2. Use safety clips (when available) to secure the plug connection.
1
EPAH327S061A1297
Fig. 5
Triggering Solenoid Valve
WARNING: Only operate with the voltage shown on the
ID plate.
Trigger the solenoid valve only when the application head is heated to
operating temperature! When the adhesive is too cold, seals in the
control module can be damaged.
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
7. Pneumatic Connection
9
The application head may only be connected to pressure–controlled and
conditioned compressed air.
NOTE: The control air must either be lubricated, or it may not be
lubricated at all. Read the chapter Lubricating or Not Lubricating the
Control Air carefully. The spray air may not be lubricated.
Safe operation and lifetime of pneumatically driven application heads
essentially depend on conditioning of the compressed air. Dust or
condensation will increase the wear on sliding surfaces and sealing
elements, thereby causing damage. To avoid these contrary influences,
the control air for Nordson application heads must be conditioned by an
air filter with air condensate bowls. The air conditioning unit cleans and
dries the compressed air.
Compressed Air Filter
(Accessory)
NOTE: The filter mesh size may not exceed 40 m.
Nordson heated air assembly kits are used to condition spray air for
spray air application heads and guns. They consist of a pressure control
valve with filter, a solenoid valve and a fine metering valve. For additional
information, refer to the manual Heated Air Assembly.
Heated Air Assembly
(Accessory)
NOTE: The spray air should be heated with an air preheater
(accessory).
Connect the control air hose to the air connection (1).
Connecting Compressed Air
1
NOTE: Ensure that control air is on at all times. Among other functions, it
keeps the nozzle closed when EMERGENCY OFF occurs or when the
system comes to a standstill. This prevents adhesive from dripping out of
the nozzle.
EPAH328S061A1297
Fig. 6
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
10
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
7. Pneumatic Connection
(contd.)
Connect the spray air hose to the air connection (1).
Connecting Spray Air
(EP 34 S and EP 34 SD)
NOTE: The spray air may never be lubricated.
1
EPAH329S061A1297
Fig. 7
Lubricating or Not Lubricating
the Control Air
Hot melt application heads of the series EP 34 manufactured from 1997
on may be operated with lubricated as well as with non-lubricated control
air. This has become possible due to modifications to the control module:
S Control module cylinder with a special inner coating
S Piston O-rings with an increased Shore hardness.
NOTE: Lubricating the control air once means that the air must always
be lubricated, because the lubricated control air washes out the
factory-applied lubricant on the control modules and the solenoid valves.
The new design control modules can be identified by an upper or lower
indentation (see arrow, fig. 8).
EPAH330S064A0997
Fig. 8
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
Operation with Non-Lubricated
Control Air
11
If new design control modules / application heads are connected to a
compressed air system which has previously been lubricated, simply
stopping the air lubrication is not sufficient. The lubricant residue in the
system would get into the control modules and the solenoid valves. It
would thus wash out the factory-applied lubricant on these parts, greatly
reducing the lifetime of the components.
For operating with non-lubricated control air ensure that:
S the unit is set to absolutely non-lubricated operation
S no oil leaking from a defective compressor gets into the air system
S control air is always supplied to the application head. It keeps the
control modules closed when EMERGENCY OFF occurs or when the
system comes to a standstill. This prevents adhesive from dripping
out of the nozzle.
NOTE: Nordson will assume no liability for damage resulting from
unapproved air lubrication, not even for short periods of time.
Operation with Lubricated
Control Air
The new design control modules or the application heads equipped with
them can also be operated with lubricated air.
NOTE: Lubricating the control air once means that the air must always
be lubricated, because the lubricated control air washes out the
factory-applied lubricant on the control modules and the solenoid valves.
Use only this lubricant:
Lubricant
Klüber Unisilkon TK002/50
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N
316 578
P/N 409090A
12
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
8. Installing Heated Hoses
WARNING: Hot! Risk of burns. Wear heat-protective gloves.
If there is cold hot melt material in the hose connection fitting (1) and/or
hose connection (2), these components must be heated until the
adhesive softens (approx. 80 _C/176 °F).
Connecting
1 2
3
1. First connect the hose (3) electrically to the unit.
2. Heat application head and hose until the adhesive softens
(approx. 80 _C/176 °F).
3. Screw the hose onto the unit.
MXHH001S050B0997
Fig. 9
WARNING: System and hot melt material pressurized. Relieve
pressure before disconnecting heated hoses. Failure to observe
can result in serious burns.
Disconnecting
Relieving Pressure
1. Set motor speed(s) of the unit feeding the adhesive to 0 min-1; switch
off motor(s).
2. Place a reservoir under the nozzle of the application head.
3. Activate the solenoid valve electrically or manually. Repeat this
procedure until no more adhesive seeps out.
4. Re-use adhesive or dispose of properly according to local regulations.
Second Open–jawed Wrench
Using a second open-jawed wrench prevents the hose connection fitting
on the unit from turning.
MXHH002S033A0295
Fig. 10
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
13
Operation
WARNING: Allow only qualified personnel to perform the
following tasks. Observe and follow the safety instructions in
this document and all other related documentation.
1. Triggering
Solenoid Valve
Trigger the solenoid valve only when the application head is heated to
operating temperature! If the adhesive is too cold, seals in the control
module can be damaged.
WARNING: Operate only with the voltage shown on the
ID plate.
2. Setting Temperatures
The procedure for setting the temperatures is described in the
temperature controller manual. Temperature controllers are not part of
the application head. They can be located e.g. in the electrical cabinet of
a hot melt application unit or in a separate electrical cabinet.
Maximum
Operating Temperature
200 °C / 392 °F; 260 °C / 500 °F with the high temperature model.
NOTE: The maximum operating temperature may not be exceeded.
Nordson will assume no warranty or liability for damage resulting from
incorrect temperature settings.
3. Adjusting
Control Air Pressure
The control air pressure for the control module is individually adjusted for
each application with an external compressed air control valve. The
compressed air control valve is not part of the application head.
NOTE: Ensure that the application head is always provided with control
air. The control air keeps the control modules closed when EMERGENCY
OFF occurs or when the system comes to a standstill. This prevents
adhesive from dripping out of the control modules.
Maximum Control Air Pressure
6 bar / 0.6 MPa / 87 psi
NOTE: The maximum control air pressure may not be exceeded.
Nordson will assume no warranty or liability for damage caused by
incorrect pressure settings.
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
14
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
The adhesive application quantity depends on the desired adhesive
application weight and on the substrate speed. Settings are usually made
with the pump speed dials. The optimum settings must be determined by
trial and error.
4. Setting Adhesive
Application Quantity
The speed dials are located e.g. in the electrical cabinet of the adhesive
applicator or in a separate electrical cabinet.
Depending on the model of the hot melt adhesive application system, the
pump speed control can also occur with a tachometer generator or an
electronic pressure controller.
All control modules are equipped with a stem stroke adjustment used for
fine metering of the adhesive quantity.
Stem Stroke Adjustment
WARNING: Hazard! The stem stroke adjustment knob has no
upper setting limit. If compressed air is connected, never completely turn up the adjustment knob / adjustment screw;
it may jump out.
Max. + 1.2 mm
Max. + 0.047 in.
1
CAUTION: The stem stroke may only be adjusted when the
application head is heated up! Failure to observe may cause
damage to seals.
Figure 11 shows:
S Latching stem stroke adjustment (1)
S Stem stroke adjustment with adjustment screw (2) and locknut (3)
S Non-adjustable stroke limitation (4).
Max. + 1.2 mm
Max. + 0.047 in.
2
3
NOTE: The stem stroke adjustment knob has no upper setting limit;
starting from the bottom, it may only be turned a maximum of 2¼ turns
upward. This corresponds to a nozzle stem stroke of maximum 1.2 mm.
Failure to observe may cause excessive wear or malfunction.
Experience has shown that a stroke adjustment of max. 0.5 to 0.6 mm
(which corresponds to 1 turn) has proven to be sufficient.
4
Stem stroke
XXAH157S130A0797
Adhesive rate
Counterclockwise
(+) = increase
Increase
Clockwise
(–) = decrease
Decrease
Fig. 11
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
5. Adjusting Spray Pattern
(EP 34 S)
15
The spray air must always be warmed up with an air preheater. The
spray pattern is optimized by alternately adjusting:
S Adhesive quantity (on the unit feeding the material)
S Stem stroke adjustment [on the application head (1)]
S Spray air pressure (on separate pressure controller)
1
1
2
2
S Spray air pressure [with adjusting screw (2)].
1. Set spray air pressure to approx. 0.5 bar / 7.25 psi / 0.05 MPa.
2. Unscrew adjustment screw for spray air pressure (2) all the way by
turning it to the left.
3. Trigger solenoid valve; material flows out.
4. Optimize spray pattern by changing the air pressure with the separate
pressure controller.
5. Make fine adjustments to the spray pressure with the adjustment
screw (2) – (only necessary in exeptional cases).
EPAH331S097A1297
Fig. 12
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
16
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
6. Adjusting Spray Pattern
(EP 34 SD)
The spray air must always be warmed up with an air preheater. The
spray pattern is optimized by alternately adjusting:
S Adhesive quantity (on the unit feeding the material)
S Stem stroke adjustment (on the application head)
S Spray air pressure (on separate pressure controller)
S Air adjustment screws “I” and “A”.
1
A
I
1. Release tube nut (2) by turning 1/2 rotation to the left.
2. Turn the air cap (3) such that the two outer pairs of holes are
perpendicular to the direction of application.
3. Tighten tube nut (3).
2
3
4. On the separate pressure controller, set spray air pressure to approx.
3 bar / 43.5 psi / 0.3 Mpa; later adapt the spray air pressure to the
spray pattern.
5. Trigger solenoid valve; adhesive seeps out.
6. Set desired amount of material.
EPAH332S097A1297
Fig. 13
7. Stop air supply to the nozzle by turning the air adjustment screws “I”
and “A” to the right.
8. Use the inner air adjustment screw “I” to set an even spray pattern.
9. Set the spray width needed with the outer air adjustment screw “A”.
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
17
Copy before filling out or use a pencil.
7. Settings Record
Production information
Adhesive
Manufacturer
Max. processing temperature
Viscosity
Cleaning agent
Manufacturer
Flash point
Basic settings
Control air pressure
Application head
Spray air pressure
Stem stroke (rotations)
Basic settings
Heating zone application head
Temperature
Undertemperature
Overtemperature
Notes
Form filled out by:
Name
E 1998 Nordson Corporation
All rights reserved
Date
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
18
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
Maintenance
WARNING: Allow only qualified personnel to perform the
following tasks. Observe and follow the safety instructions in
this document and all other related documentation.
NOTE: Maintenance is an important preventive measure for maintaining
operating safety and extending the operational lifetime of the unit. It
should not be neglected under any circumstances.
WARNING: System and hot melt material pressurized. Before
disconnecting heated hoses and replacing filter cartridges,
relieve system pressure. Failure to observe can result in serious
burns.
1. Relieving Pressure
WARNING: Hot! Risk of burns. Wear heat-protective gloves.
1. Set motor speed(s) of the unit feeding the material to 0 min-1; switch
off motor(s).
2. Place a reservoir under the nozzle of the application head.
3. Trigger the solenoid valve electrically or manually. Repeat until
adhesive no longer seeps out of the nozzle.
4. Re-use hot melt material or dispose of properly according to local
regulations.
EPAH208L058A0997
Fig. 14 Principle drawing material–pressure relief
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
The stated intervals are based on general experience. Depending on the
location of the unit, the production conditions and the operating time,
other maintenance intervals may prove necessary.
2. Daily Maintenance
Activity
Unit Part
Interval
Refer to
Application head
Inspection for damage
External cleaning
Daily
Daily
Page 19
Nozzle
External cleaning
Daily
Page 20
Inspection for External Damage
External Cleaning of
Application Head
19
WARNING: If damaged parts endanger the operating safety of
the application head and/or the safety of personnel, switch off
the application head and have the damaged parts replaced by
qualified personnel. Use only original Nordson spare parts.
External cleaning prevents impurities created during production from
causing unit malfunctions.
CAUTION: Do not damage or remove warning signs. Damaged
or removed warning signs must be replaced by new ones.
CAUTION: Never use hard tools. Use extreme care when
handling the nozzle.
Remove adhesive residue with a cleaning agent recommended by the
adhesive manufacturer whenever possible. Heat with an air heater if
necessary. Remove dust, fluffs, etc. with a vacuum cleaner or a soft cloth.
Release–coated Application Heads
CAUTION: Do not use hard or metal tools to clean. Do not use
wire brushes! The release coating could become damaged. Use
only soft aids (wooden or PTFE spatulas or soft brushes).
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
20
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
2. Daily Maintenance (contd.)
CAUTION: Clean the nozzle very carefully; never use hard or
metallic tools to clean. A damaged nozzle will result in uneven
adhesive application, and it will need to be repaired.
External Cleaning of Nozzle
WARNING: Hot! Risk of burns. Wear heat-protective gloves.
1. Remove hot melt material residue from the nozzle promptly with a
soft cloth. This should be done before the material cracks.
2. Remove severe and hardened residue with a wooden or PTFE
spatula if necessary.
3. Regular Maintenance
The stated intervals are based on general experience. Depending on the
location of the unit, the production conditions and the operating time,
other maintenance intervals may prove necessary.
Activity
Unit part
Interval
Refer to
Application head
Rinse with cleaning agent
When soiled or when
replacing adhesive
–
Nozzle
Disassemble and clean
When soiled
–
Control module
Check leakage hole
Weekly
–
Filter (option)
Changing Type of Adhesive
Separate manual
NOTE: Before changing the adhesive, find out whether the new
adhesive may be mixed with the old.
S The adhesives may be mixed: The new adhesive can be used to
rinse out the old adhesive.
S The adhesives may not be mixed: Thoroughly rinse with a cleaning
agent recommended by the adhesive manufacturer.
NOTE: Dispose of adhesive and cleaning agent according to local
regulations.
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
4. Maintenance Record
Unit part
Copy before filling out or use a pencil.
Activity
Date
Application head
Rinse with cleaning agent
Nozzle
Disassemble and clean
Control module
Check leakage hole
Filter (option)
Replace filter screen
E 1998 Nordson Corporation
All rights reserved
21
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
Name
Date
Name
P/N 409090A
22
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
Repair/Retrofitting
WARNING: Allow only qualified personnel to perform the
following tasks. Observe and follow the safety instructions in
this document and all other related documentation.
1. Retrofitting Application
Head with New
Control Modules
Beginning with units manufactured in 1997, EP 34 application heads may
be operated with either non-lubricated or lubricated compressed air. If
older models are to be retrofitted for operation with non-lubricated
compressed air, the control modules must be replaced.
If an older application head is going to be retrofitted in order to operate
with non-lubricated control air, these measures must be taken:
S Replace control module with new design control module
S Replace solenoid valve
S Completely change the pressurized control air supply to absolute
non-lubricated air.
S Adjust the stem stroke (see Stem Stroke Adjustment).
2. Replacing Single Control
Modules
If only some of the control modules of an application head are to be
replaced, the application head must continue to be operated with
lubricated control air. These lubricants may be used:
Lubricant
P/N 409090A
P/N
Klüber Unisilkon TK002/100
253 700
Klüber Unisilkon TK002/50
316 578
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
3. Removing and Installing
Control Module
23
WARNING: Hot! Risk of burns. Wear heat-protective gloves.
1. Heat up application head until adhesive softens
2. Unscrew fixing screws and remove the control module.
NOTE: Nordson recommends completely replacing the control modules,
as opposed to disassembling them.
3x P/N 250 247
EPAH333S050A1297
Fig. 15
Removing
1. Heat up application head until adhesive softens.
2. Release fastening screws and remove control module.
Installing
1. Heat up application head until adhesive softens.
2. If possible, apply mounting paste to the thread of the fixing screws to
prevent seizing of the threads.
Mounting paste: Never Seez, order no. P/N 263 921.
3. Replace O-ring(s). Order no. P/N 250 247.
4. Secure control module to application head and tighten screws.
E 1998 Nordson Corporation
All rights reserved
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
24
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
Troubleshooting
1. Troubleshooting Table
Problem
No adhesive
No adhesive:
application head
is cold
Adhesive
application is not
exact
The following troubleshooting table assumes that all other system
components function correctly.
Possible Cause
Corrective Action
Refer to
Application head has not yet
reached operating temperature
Wait until temperature has been
reached, check temperature setting
if necessary
Page 13
Not enough adhesive in the
application unit
Fill
–
Pump of the hot melt material
application unit does not work
Check
–
Control air not connected
Connect
Page 9
Nozzle blocked
Clean nozzle
Page 20
Filter (option) blocked
Clean filter and replace filter screen
Nozzle stem is stuck
Replace control module
Page 22
Temperature not correctly set on
temperature controller
Set correct temperature
Page 13
Plug has no contact
Secure plug
Page 8
Heater cartridge(s) defective
Replace heater cartridge(s)
–
Nozzle partially blocked or
damaged
Unscrew nozzle (when warm) and
clean or replace
–
–
–
The open time is
too long
The open time is
too short
P/N 409090A
Production parameters not attuned
to one another
Adjust parameters, change if
necessary
Unsuitable adhesive
Consult adhesive manufacturer
Application temperature too high
Set temperature lower
Unsuitable adhesive
Consult adhesive manufacturer
Application temperature too low
Set temperature higher
Unsuitable adhesive
Consult adhesive manufacturer
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
–
Data sheet
Page 13
Data sheet
Page 13
Data sheet
E 1998 Nordson Corporation
All rights reserved
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
25
Specifications
NOTE: The specifications are valid only for standard application heads.
1. General Data
Product
Hot melt material application head
Product Name
EP 34 / EP 34 S / EP 34 SD
(Options: release coating, high temperature (T version),
high material flow rate (V version)
Operating Voltage
Refer to ID plate
Power Consumption
Refer to ID plate
Type of Control Module
Variations:
Standard, Zero Cavity
Filter (Option)
Variations:
none, 0.1 mm, 0.2 mm, 0.4 mm
Nozzles
Variations:
0.6 mm, 0.8 mm, 1.0 mm
Temperature Sensor
Variations:
Fe-CuNi (FE/KO), Pt 100, Ni 120
Solenoid Valve
Variations:
MV 24-U 24 VDC, MV 240-1U 240 VAC,
MV 110-1U 110 VAC
Degree of Protection
IP 30
Max. Control Air Pressure
6 bar / 0,6 MPa / 87 psi
Hose Connection Fitting
Variations:
Max. Operating Temperature
200 °C / 392 °F; 260 °C / 500 °F with high temperature version
Max. Ambient Temperature for
Solenoid Valves
Approx. 55 °C / 131 °F
Weight
Approx. 1100 g
E 1998 Nordson Corporation
All rights reserved
Inside diameter: 8 mm, 13 mm
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
P/N 409090A
26
Electropneumatic Hot Melt Application Heads EP 34 / EP 34 S / EP 34 SD
2. Power Cables
8 Green/yellow Ground conductor
2 Blue
Heater
3 Brown
4 Black
Solenoid valve
5 Black
Pin insert HAN 7D KWU
6 Red
Thermo lead +
7 Blue
Thermo lead –
XXAH135L046B0598
Fig. 16 Power cable for temperature sensor Fe-CuNi (FE/KO)
8 Green/yellow Ground conductor
2 Blue
Heater
3 Brown
4 Black
Solenoid valve
5 Black
6 Red (black)
Pin insert HAN 7D KWU
Temperature sensor Pt 100
7 White (black)
XXAH249L046B0598
Fig. 17 Power cable for temperature sensor Pt 100
1
Black
2
Black
3
5
Green/yellow
Heater
Temperature sensor Ni 120
Ground conductor
XXAH129L046B0598
Fig. 18 Power cable with temperature sensor Ni 120
P/N 409090A
EP 34 / EP 34 S / EP 34 SD
Issued 05/98
E 1998 Nordson Corporation
All rights reserved