Electropneumatic Hot Melt Application Heads 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 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 1998 Nordson Corporation
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 1998 Nordson Corporation
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 1998 Nordson Corporation
Table of Contents III Repair/Retrofitting 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 1998 Nordson Corporation
IV Table of Contents 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 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: In defective condition When modifications or changes have been made by the customer In a potentially explosive atmosphere When hot melt materials not suitable for the unit are used When the values stated under Specifications are not complied with. The application heads may not be used to process the following materials: Polyurethane hot melt material (PUR) Explosive and flammable materials Erosive and corrosive materials Food products. 1998 Nordson Corporation
2 Electropneumatic Hot Melt Application Heads 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: Risk of burns on the hot application head: from hot adhesive, when replacing filter cartridges (option) and when making adjustments. 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). 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 3 4. Illustrations Application Head EP 34 Figure 1 shows the essential components of the application head EP 34. 1 2 10 3 9 8 7 6 5 4 EPAH324L199B0698 Fig. 1 1. Solenoid valve 2. Control air connection 3. Power cable 4. Hose connection (adhesive) 5. Bracket 6. Body 7. Control module 8. Leakage hole 9. Nozzle EP 34 10. Stem stroke adjustment 1998 Nordson Corporation
4 Electropneumatic Hot Melt Application Heads 4. Illustrations (contd.) Application Head EP 34 S Figure 2 shows the essential components of the application head EP 34 S. 1 11 12 2 3 4 10 9 8 7 6 5 EPAH325L199A1297 Fig. 2 1. Solenoid valve 2. Control air connection 3. Spray air connection 4. Power cable 5. Hose connection (adhesive) 6. Bracket 7. Body 8. Control module 9. Leakage hole 10. Nozzle EP 34 S 11. Stem stroke adjustment 12. Air adjustment screw spray air 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 5 Application Head EP 34 SD Figure 3 shows the essential components of the application head EP 34 SD. 1 11 A I 12 13 2 3 4 10 9 8 7 6 5 EPAH326L199A1297 Fig. 3 1. Solenoid valve 2. Control air connection 3. Spray air connection 4. Power cable 5. Hose connection (adhesive) 6. Bracket 7. Body 8. Control module 9. Leakage hole 10. Nozzle EP 34 SD 11. Stem stroke adjustment 12. Air adjustment screw o(uter) spray air 13. Air adjustment screw i(nner) spray air 1998 Nordson Corporation
R 6 Electropneumatic Hot Melt Application Heads 5. Functioning 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). 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 Nordson Engineering GmbH D 21337 Lüneburg Germany 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 V W CFSY084S0501095 Fig. 4 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 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: Do not operate in an explosive atmosphere Protect from humidity, vibrations, dust and drafts Ensure easy access to parts relevant to maintenance and operation 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. 1998 Nordson Corporation
8 Electropneumatic Hot Melt Application Heads 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. 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 9 7. Pneumatic Connection 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. Compressed Air Filter (Accessory) 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. NOTE: The filter mesh size may not exceed 40 m. Heated Air Assembly (Accessory) 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. NOTE: The spray air should be heated with an air preheater (accessory). Connecting Compressed Air Connect the control air hose to the air connection (1). 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 1998 Nordson Corporation
10 Electropneumatic Hot Melt Application Heads 7. Pneumatic Connection (contd.) Connecting Spray Air (EP 34 S and EP 34 SD) Connect the spray air hose to the air connection (1). 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: Control module cylinder with a special inner coating 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 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 11 Operation with Non-Lubricated Control Air 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: the unit is set to absolutely non-lubricated operation no oil leaking from a defective compressor gets into the air system 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 P/N Klüber Unisilkon TK002/50 316 578 1998 Nordson Corporation
12 Electropneumatic Hot Melt Application Heads 8. Installing Heated Hoses WARNING: Hot! Risk of burns. Wear heat-protective gloves. Connecting 1 2 3 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). 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 Disconnecting WARNING: System and hot melt material pressurized. Relieve pressure before disconnecting heated hoses. Failure to observe can result in serious burns. 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 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 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. 1998 Nordson Corporation
14 Electropneumatic Hot Melt Application Heads 4. Setting Adhesive Application Quantity 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. 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. Stem Stroke Adjustment All control modules are equipped with a stem stroke adjustment used for fine metering of the adhesive quantity. Max. + 1.2 mm Max. + 0.047 in. 1 Figure 11 shows: 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. CAUTION: The stem stroke may only be adjusted when the application head is heated up! Failure to observe may cause damage to seals. Max. + 1.2 mm Max. + 0.047 in. 2 3 4 Latching stem stroke adjustment (1) Stem stroke adjustment with adjustment screw (2) and locknut (3) Non-adjustable stroke limitation (4). NOTE: The stem stroke adjustment knob has no upper setting limit; starting from the bottom, it may only be turned a maximum of 2 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. Stem stroke Adhesive rate XXAH157S130A0797 Counterclockwise (+) = increase Clockwise ( ) = decrease Increase Decrease Fig. 11 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 15 5. Adjusting Spray Pattern (EP 34 S) The spray air must always be warmed up with an air preheater. The spray pattern is optimized by alternately adjusting: Adhesive quantity (on the unit feeding the material) Stem stroke adjustment [on the application head (1)] Spray air pressure (on separate pressure controller) 1 2 1 2 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 1998 Nordson Corporation
16 Electropneumatic Hot Melt Application Heads 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: Adhesive quantity (on the unit feeding the material) A 1 I Stem stroke adjustment (on the application head) Spray air pressure (on separate pressure controller) Air adjustment screws I and A. 3 2 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). 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. EPAH332S097A1297 6. Set desired amount of material. 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. 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 17 7. Settings Record Copy before filling out or use a pencil. Production information Adhesive Cleaning agent Basic settings Application head Basic settings Temperature Manufacturer Max. processing temperature Viscosity Manufacturer Flash point Control air pressure Spray air pressure Stem stroke (rotations) Heating zone application head Undertemperature Overtemperature Notes Form filled out by: Name Date 1998 Nordson Corporation
18 Electropneumatic Hot Melt Application Heads 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. 1. Relieving Pressure 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. 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 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 19 2. Daily 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. Unit Part Activity Interval Refer to Application head Inspection for damage External cleaning Daily Daily Page 19 Nozzle External cleaning Daily Page 20 Inspection for External Damage 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 of Application Head 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). 1998 Nordson Corporation
20 Electropneumatic Hot Melt Application Heads 2. Daily Maintenance (contd.) External Cleaning of Nozzle 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. 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. Unit part Activity 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) Separate manual Changing Type of Adhesive NOTE: Before changing the adhesive, find out whether the new adhesive may be mixed with the old. The adhesives may be mixed: The new adhesive can be used to rinse out the old adhesive. 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. 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 21 4. Maintenance Record Copy before filling out or use a pencil. Unit part Activity Date Name Date Name Application head Rinse with cleaning agent Nozzle Disassemble and clean Control module Check leakage hole Filter (option) Replace filter screen 1998 Nordson Corporation
22 Electropneumatic Hot Melt Application Heads 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: Replace control module with new design control module Replace solenoid valve Completely change the pressurized control air supply to absolute non-lubricated air. 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 Klüber Unisilkon TK002/100 253 700 Klüber Unisilkon TK002/50 316 578 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 23 3. Removing and Installing Control Module 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. 1998 Nordson Corporation
24 Electropneumatic Hot Melt Application Heads Troubleshooting 1. Troubleshooting Table The following troubleshooting table assumes that all other system components function correctly. Problem Possible Cause Corrective Action Refer to No adhesive 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 Pump of the hot melt material application unit does not work Fill 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 No adhesive: application head is cold 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) Adhesive application is not exact Nozzle partially blocked or damaged Unscrew nozzle (when warm) and clean or replace Production parameters not attuned to one another Adjust parameters, change if necessary Unsuitable adhesive Consult adhesive manufacturer Data sheet The open time is too long The open time is too short Application temperature too high Set temperature lower Page 13 Unsuitable adhesive Consult adhesive manufacturer Data sheet Application temperature too low Set temperature higher Page 13 Unsuitable adhesive Consult adhesive manufacturer Data sheet 1998 Nordson Corporation
Electropneumatic Hot Melt Application Heads 25 Specifications 1. General Data NOTE: The specifications are valid only for standard application heads. Product Product Name Hot melt material application head (Options: release coating, high temperature (T version), high material flow rate (V version) Operating Voltage Power Consumption Refer to ID plate 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 V DC, MV 240-1U 240 V AC, MV 110-1U 110 V AC Degree of Protection IP 30 Max. Control Air Pressure 6 bar / 0,6 MPa / 87 psi Hose Connection Fitting Variations: Inside diameter: 8 mm, 13 mm Max. Operating Temperature Max. Ambient Temperature for Solenoid Valves 200 C / 392 F; 260 C / 500 F with high temperature version Approx. 55 C / 131 F Weight Approx. 1100 g 1998 Nordson Corporation
26 Electropneumatic Hot Melt Application Heads 2. Power Cables 8 Green/yellow Ground conductor 2 Blue 3 Brown Heater 4 Black 5 Black Solenoid valve Pin insert HAN 7D KWU 6 Red 7 Blue Thermo lead + Thermo lead XXAH135L046B0598 Fig. 16 Power cable for temperature sensor Fe-CuNi (FE/KO) 8 Green/yellow Ground conductor 2 Blue 3 Brown Heater 4 Black 5 Black Solenoid valve Pin insert HAN 7D KWU 6 Red (black) Temperature sensor Pt 100 7 White (black) XXAH249L046B0598 Fig. 17 Power cable for temperature sensor Pt 100 1 2 Black Black 3 5 Green/yellow Heater Temperature sensor Ni 120 Ground conductor XXAH129L046B0598 Fig. 18 Power cable with temperature sensor Ni 120 1998 Nordson Corporation