pressure control unit wm 302 -...

Pressure Control UnitWM 302

Manual P/N 317 146 B-- English --

NORDSON WALCOM D UDENHOUT D THE NETHERLANDS

E 1997 Nordson CorporationAll rights reserved

WM 302Issued 02/97

COV_EN_317146B

Order numberP/N = Order number for Nordson products

NoticeThis is a Nordson Corporation publication which is protected by copyright. Original copyright date 1996.

No part of this document may be photocopied, reproduced, or translated to another language without the priorwritten consent of Nordson Corporation. The information contained in this publication is subject to change without

notice.

TrademarksAquaGuard, Blue Box, Control Coat, Equi=Bead, FloMelt, FoamMelt, FoamMix, Helix, Hot Shot, Hot Stitch,

Meltex, MicroSet, MultiScan, Nordson, the Nordson logo, OmniScan, Porous Coat, Posi-Stop, RBX, Sure-Bond,UniScan, UpTime, and Versa-Spray are registered trademarks of Nordson Corporation.

BetterBookSM, CF, Controlled Fiberization, Easy-Screen, Fibermelt, Flo-Tracker, PrintGuard, and Package ofValues are trademarks of Nordson Corporation.

Table of Contents I


WM 302Issued 02/97

Manual 54--WM302--MA--01

Table of Contents

Your Safety is Important to Nordson 0-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

We Welcome Your Suggestions O-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Europe O-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Distributors in Eastern & Southern Europe O-3. . . . . . . . . . . . . . . . . . . . . . .

Outside Europe / Hors d’Europe / Fuera de Europa O-4. . . . . . . . . . . . . . . .

Africa / Middle East O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Asia / Australia / Latin America O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Japan O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

North America O-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Safe Operation 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Safety Symbols 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Qualified Personnel 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Intended Use 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Installation and Electrical Connections 1-4. . . . . . . . . . . . . . . . . . . . . . .

6. Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Less--obvious Dangers 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Action in the Event of System Malfunction 1-5. . . . . . . . . . . . . . . . . .

7. Maintenance / Repair 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Cleaning 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Liquid Adhesives 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dear Customer

Nordson International

Section 1Safety Cold Glue

Table of ContentsII


WM 302Issued 02/97


1. Operate Safely 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Safety Symbols 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Qualified Personnel 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Intended Use 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Installation and Electrical Connections 1-4. . . . . . . . . . . . . . . . . . . . . . .

6. Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Less-obvious Dangers 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Action in the Event of Unit Malfunction 1-5. . . . . . . . . . . . . . . . . . . . .

Danger of Burns 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Maintenance/Repair 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Cleaning 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Thermoplastic Hot Melt Material 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Equipment and Material Disposal 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Intended Use 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unintended Use --Example-- 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Residual Risks 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Introduction 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Updated Bill of Material 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Functioning 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Features 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Front Side 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Rear Side 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1Safety Hot Melt

Section 2Description

Table of Contents III


WM 302Issued 02/97


1. Transport 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Unpacking 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Setting Up 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Removing 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Storage 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Disposal 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Electrical Connections 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mains Power 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Encoder 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adhesive Gun 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Proportional Valve 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessories 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Initial Setup 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Daily Startup 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Daily Shutdown 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Emergency Switch-Off 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Adjustments 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mode Selection (Selection Switch A) 4-2. . . . . . . . . . . . . . . . . . . . . .

Indication of Production Speed 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjusting Minimum Speed (Potentiometer E) 4-3. . . . . . . . . . . . . . .

Adjusting Minimum Pressure (Potentiometer C) 4-4. . . . . . . . . . . . .

Adjusting Maximum Pressure (Potentiometer D) 4-4. . . . . . . . . . . .

Change from Automatic to Manual Operation(Selection Switch B) 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Display / LEDs 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LEDs 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. List of Adjustments 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 3Installation

Section 4Operation

Table of ContentsIV


WM 302Issued 02/97


1. Maintenance 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Troubleshooting 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Repair 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. WM 302 and Accessories 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Updated Bill of Material 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuse 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. General Data 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Connection Allocation 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Encoder Input 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Proportional Valve Outputs 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adhesive Gun Outputs 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Dimensions 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 5Maintenance /Troubleshooting / Repair

Section 6Parts

Section 7Specifications

O-1Introduction


54--WM302--MA--01 CONG_EN_B--1294

Dear Customer

Nordson equipment is engineered and manufactured in accordance withstrict specifications, using high-quality components and state-of-the-arttechnologies that assure reliable, long-term performance. Your productwas thoroughly tested for proper operation prior to shipment.

Data and specifications included in this manual are accurate at the timeof publication. Nordson reserves the right to change the contents of thismanual and/or specification without notice.

Carefully read the manual first. It is your guide to safe installation,productive operation and effective maintenance. We recommend that youkeep the manual available for future reference.

Carefully read the Safety instructions. Your product is designed for safeoperation when used according to the published instructions. However,potential hazards exist when instructions -- particularly safety instructions --in this manual and all related documentation are not followed.

If you have any comments or questions concerning Nordson products,spare parts or manuals, do not hesitate to contact Nordson. Foraddresses see Nordson International.

Your Safety is Important toNordson

We Welcome YourSuggestions

O-2 Introduction


54--WM302--MA--01CONG_EN_B--1294

O-3Introduction


54--WM302--MA--01 NI_EN_I--0100

Nordson International

Country Phone Fax

Austria 43-1-707 5521 43-1-707 5517

Belgium 31-13-511 8700 31-13-511 3995

Czech Republic 4205-4159 2411 4205-4124 4971

Denmark 45-4366 0123 45-4364 1101

Finland 358-9-530 8080 358-9-530 80850

France 33-1-6412 1400 33-1-6412 1401

Germany Erkrath 49-211-92050 49-211-254 658

Lüneburg 49-4131-8940 49-4131-894 149

Italy 39-02-904 691 39-02-9078 2485

Netherlands 31-13-511 8700 31-13-511 3995

Norway 47-23-03 6160 47-22-68 3636

Poland 48-22-836 4495 48-22-836 7042

Portugal 351-2-961 9400 351-2-961 9409

Russia 7-812-224 0439 7-812-224 0439

Slovak Republic 4205-4159 2411 4205-4124 4971

Spain 34-96-313 2090 34-96-313 2244

Sweden 46-40-680 1700 46-40-932 882

Switzerland 41-61-411 3838 41-61-411 3818

UnitedKingdom

Hot Melt 44-1844-26 4500 44-1844-21 5358Kingdom

Finishing 44-161-495 4200 44-161-428 6716

SpectralTechnology

44-1753-528 151 44-1753-691 351

Contact: Nordson DED,Germany

49-211-92050 49-211-254652

Europe

Distributors in Eastern &Southern Europe

O-4 Introduction


54--WM302--MA--01NI_EN_I--0100

S For your nearest Nordson office outside Europe, contact the Nordsonoffices below for detailed information.

S Pour toutes informations sur représentations de Nordson dans votrepays, veuillez contacter l’un de bureaux ci-dessous.

S Para obtenir la dirección de la oficina correspondiente, por favordiríjase a unas de las oficinas principales que siguen abajo.

Contact Nordson Phone Fax

DED, Germany 49-211-92050 49-211-254 652

Pacific South Division,USA

1-440-988-9411 1-440-985-3710

Japan 81-3-5762 2700 81-3-5762 2701

Canada 1-905-475 6730 1-905-475 8821

USA Hot Melt 1-770-497 3400 1-770-497 3500

Finishing 1-440-988 9411 1-440-985 1417

Outside Europe /Hors d’Europe /Fuera de Europa

Africa / Middle East

Asia / Australia / Latin America

Japan

North America



Section 1

Safety Cold Glue

Safety1-0



Safety 1-1



Section 1Safety Cold Glue

Safety instructions contained in this section and throughout thisdocument apply to tasks that may be performed with the liquid adhesiveapplication system components and the liquid adhesive used. It is veryimportant that these safety instructions are always followed. Failure to doso could result in personal injury, death and/or damage to the system orother equipment.

With this in mind, here are some basic safety recommendations:

S Read and become familiar with the Safety section prior to installing,operating maintaining or repairing the system.

S Read and follow the warnings which appear within the text and arerelated to specific tasks.

S Store this document within easy reach of personnel operating ormaintaining the system.

S Wear personal protective equipment such as safety goggles, glovesor respiratory equipment where this is required by peculiarities of thesystem and/or the material.

S Familiarize yourself with and follow all safety instructions prescribedby your company, general accident prevention regulations andgovernment safety regulations.

1. Safe Operation

Safety1-2



The following symbols are used to warn against dangers or possiblesources of danger. Become familiar with them! Failure to heed a warningcould lead to personal injury, death and/or damage to the system or otherequipment.

WARNING: Failure to observe may result in personal injury,death, or equipment damage.

WARNING: Risk of electrical shock. Failure to observe mayresult in personal injury, death, or equipment damage.

WARNING: Disconnect equipment from the line voltage.

WARNING: Danger! High pressure. Wear safety goggles whenworking on a liquid adhesive application system.

WARNING: Risk of explosion or fire. Fire, open flames andsmoking prohibited.

WARNING: System and material pressurized. Releasepressure. Failure to observe may result in serious injury.

CAUTION: Failure to observe may result in equipmentdamage.

2. Safety Symbols

Safety 1-3



”Qualified personnel” is defined here as individuals who thoroughlyunderstand the equipment and its safe operation, maintenance andrepair. Qualified personnel are physically capable of performing therequired tasks, familiar with all relevant safety rules and regulations andhave been trained to safely install, operate, maintain and/or repair theequipment. It is the responsibility of the company operating theequipment to see that its personnel meet these requirements.

The system is designed and intended to be used only for the purposedescribed in the Description section. Uses not in accordance with thatsection or as described in this document are considered unintended usesand not in accordance with governing regulations.

WARNING: Use of this equipment in ways other thandescribed in this document may result in personal injury, death,or equipment damage.

The following actions of the owner or operator of the system are some,but not all, examples of unintended use which would permit Nordson toclaim it is not responsible for personal injury or property damage arisingfrom such unintended use:

S Unapproved modifications or changes to the system

S Failure to comply with the safety instructions

S Failure to comply with the instructions concerning installation, use,operation, maintenance or repair, or when these tasks are carried outby unqualified personnel

S Use of inappropriate or incompatible foreign materials or auxiliaryequipment

S Failure to observe workplace safety rules or regulations issued bygovernment authorities or safety councils.

3. Qualified Personnel

4. Intended Use

Safety1-4



S Prior to installation, check intended location and surrounding area forany potential hazards during operation.

S All electrical, pneumatic, gas and hydraulic connections andinstallation of all system components may only be carried out byqualified personnel. Observe installation instructions for componentsand accessories.

S Equipment must be properly grounded and fused according to therated current consumption (see ID plate).

S Cables which run outside the system must regularly be checked forwear or damage.

S Power supply wire gauge and insulation must be sufficient to handlerated current consumption.

S Cables must never be squeezed or pinched. Do not locate cables orhoses in high traffic areas.

S Check liquid adhesive feed hoses, screwed connections andcompressed air lines regularly for leaks. These are to be replaced atthe first signs of cracks, brittleness etc. Release system pressurecompletely beforehand.

WARNING: Failure to install the system properly, and espe-cially failure to ensure electrical, pressurized and high pressurefeed connections are made correctly may result in serious injuryor death.

The system should only be operated when it is in working order. It shouldonly by operated by qualified persons following all regulations valid forliquid adhesive systems.

S Never allow the system to be operated by personnel under theinfluence of substances which reduce their reaction times, or who arenot able to operate the equipment for physical reasons.

S Prior to each startup of the system, check protection and warningdevices and make sure they are fully functional. Do not operate theequipment if these devices are not functioning properly.

S When the removal of safety equipment is required for installation,maintenance or repair, it must be reconnected immediately uponcompletion of the work.

S In a humid environment, only equipment featuring a correspondingclass of protection may be operated.

S Do not operate the system in an explosive environment.

5. Installation and ElectricalConnections

6. Operation

Safety 1-5



S Keep parts of the body and clothing away from rotating parts. Do notwear loose articles of clothing when operating or servicing equipmentwith rotating parts. Remove wrist watches, rings, necklaces or similarjewelry and pin up or cover long hair before performing any work onor with the equipment. The wearing of protective gloves may provehazardous in certain circumstances where rotating parts are presentand may therefore be forbidden.

S To carry out measurements on the substrate or system components,switch off parent machine and/or system and wait until the equipmentcomes to a standstill.

S Never point guns or applicator nozzles at yourself or other persons.

WARNING: An operator or service technician working with theequipment should be aware of the less--obvious dangers thatoften cannot be completely minimized at production sites:

S Pressurized system components

S The possibility that electrical potentials may remain in the systemafter the system was de--energized

S Liquid adhesive vapors

S Hydraulically or pneumatically operated system components

S Uncovered winding parts

If the system malfunctions, switch it off immediately.

S Turn the main switch off, or use emergency stop switch or similarsafety feature as provided.

S After equipment has come to a standstill and before reoperating it,have it repaired by qualified personnel.

6. Operation (contd.)

Less-obvious Dangers

Action in the Event of SystemMalfunction

Safety1-6



Allow only qualified personnel to perform the procedures described in thisdocument. Work should only be carried out on a completelydepressurized system, following all safety procedures.

NOTE: Depending on the configuration of the liquid adhesive applicationsystem, high pressure may remain between application head(s) andpressure regulator or pump/s even after the system has been switchedoff using the main switch or the emergency stop. This especially appliesto multi--hose configurations between pump/s and application head/s.

S Prior to maintenance and repair work it is therefore essential toensure that all liquid adhesive application system components aredepressurized as follows:

1. Release input pressure in front of pump by shutting off customercompressed air supply.

2. Release any remaining system pressure behind the pumps bymanually operating the application heads.

S Secure pneumatically-- and hydraulically--operated equipment againstuncontrolled movement.

S Switch off system electrically.

WARNING: Some voltage is still present in the control cabineteven after equipment has been turned off at the main switch.Complete the following steps prior to maintenance or repair:

1. Disconnect external power supply.

2. Lock out external power supply.

3. Check no voltage is present.

4. Ground and short.

5. Cover nearby live sections.

If liquid adhesive application system is left idle for extended periods (e.g.overnight or long breaks) Nordson recommends applying Vaseline to theapplication head nozzles to prevent them from drying out and becomingblocked as a result.

S Only use genuine Nordson parts.

7. Maintenance / Repair

Safety 1-7



NOTE: Always refer to the liquid adhesive manufacturer’s MaterialSafety Data Sheet or material information sheet before working with anycleaning fluids.

WARNING: Never clean any aluminium part or flush any sy-stem using halogenated hydrocarbon fluids. Examples of com-mon halogenated hydrocarbons are: dichloromethylene,1,1,1--trichloroethylene and perchlorethylene. Halogenated hy-drocarbons may react violently with aluminium parts.

S Never use an open flame to clean the system or its components.

S Check that (warm) water can be used to clean the liquid adhesivesystem components, possibly with the addition of householdwashing--up liquid. If this is not possible, use only the cleaning fluidstated in the liquid adhesive manufacturer’s information. If themanufacturer recommends heating the cleaner, note the flash point.

S Ensure sufficient room ventilation to draw off vapors.

WARNING: Fire, open flames and smoking are prohibitedwhen cleaning fluids are used. Observe all explosion preventionregulations. Cleaning fluids may only be heated using tempera-ture controlled and explosion--protected heaters.

S Disposal must be according to the waste key in the DIN Safety DataSheet. Liquid adhesives or residue, solvent or separating agents mustnot be released into open waterways. In the case of a leak or spillage,contain liquid and if necessary use an absorbant material e.g.sawdust to soak it up; then proceed according to the relevant wastedisposal regulations.

S If the liquid adhesive application system is to be idle for an extendedperiod, the entire system should be flushed and outlets sealed withVaseline. Warm water is usually used to flush application systemswith which water based liquid adhesives are processed.

S If the liquid adhesive manufacturer specially recommends a flushingagent, the manufacturer’s safety and disposal details must befollowed.

8. Cleaning

Safety1-8



As there is a wide variety of liquid adhesives available with differentcompositions and characteristics, it is impossible here to give anexhaustive list of safety notes reflecting the typical characteristics ofliquid adhesives. The use of liquid adhesives in Nordson’s liquid adhesiveapplication systems therefore requires reference to the liquid adhesivemanufacturer’s documents beforehand.

Information relating to safety aspects e.g. concerning solvent content,hazards and countermeasures in the event of liquid adhesive coming intocontact with skin or mucous membranes are contained in the technicaldata sheets and the DIN Safety Data Sheets from the manufacturer.

NOTE:

S Always refer to the manufacturer’s Material Safety Data Sheet ormaterial information before working with any liquid adhesives.

S It may be necessary to refer to the manufacturer’s notes on the use ofmaterials from a third party. These may be required for processing aliquid adhesive, but hazards arising from their use are not necessarilymentioned by the manufacturer of the liquid adhesive.

S Liquid adhesives may still give off vapors when they are processedcorrectly. The smell produced can cause some annoyance. This isespecially true where liquid adhesives are used that contain solvent,thus requiring the use of breathing equipment e.g. a filter.

S If the prescribed processing conditions are not followed, harmfuldecomposition products may develop. Therefore, the vapors must beremoved.

S Wash hands well before breaks and when work is finished.

S If liquid adhesive comes into contact with eyes or mucousmembranes, rinse well with water -- especially the eyes. Changedamp clothes, and seek medical advice if it is swallowed.

S Disposal must be according to the waste key in the DIN Safety DataSheet. Liquid adhesives or residue, solvent or separating agents mustnot be released into open waterways. In the case of a leak or spillage,contain liquid and if necessary use an absorbant material e.g.sawdust to soak it up; then proceed according to the relevant wastedisposal regulations.

S If solvents or separating agents are used to process a liquidadhesive, follow the safety and disposal information from themanufacturer.

9. Liquid Adhesives

E 1994 Nordson CorporationAll rights reserved Issued 11/94


Section 1

Safety Hot Melt

Safety1-0

E 1994 Nordson CorporationAll rights reservedIssued 11/94


Safety 1-1



Section 1Safety Hot Melt

Safety instructions contained in this section and throughout this docu-ment apply to tasks that may be performed with or on the unit. Warningsrelated to specific safety concerns are included within the text as ap-propriate. It is very important that these safety instructions are alwaysfollowed. Failure to do so could result in personal injury and/or damage tothe unit or other equipment.

With this in mind, here are some basic safety recommendations:

S Read and become familiar with this Safety section prior to installing,operating, maintaining, or repairing the unit.

S Read and follow the warnings which appear within the text and arerelated to specific tasks.

S Store this document within easy reach of personnel operating ormaintaining the unit.

S Wear personal protective equipment and clothing such as safetygoggles and gloves.

S Familiarize yourself with and follow all safety instructions prescribedby your company, general accident-prevention regulations, andgovernment safety regulations.

1. Operate Safely

Safety1-2



The following symbols are used to warn against dangers or possiblesources of danger. Become familiar with them! Failure to heed a warningcould lead to personal injury and/or damage to the unit or other equip-ment.

WARNING: Failure to observe may result in personal injury,death, or equipment damage.

WARNING: Risk of electrical shock. Failure to observe mayresult in personal injury, death, or equipment damage.

WARNING: Disconnect equipment from the line voltage.

WARNING: Hot! Risk of burns. Wear heat-protective clothing,safety goggles, and/or heat-protective gloves depending on thesymbols shown.

WARNING: Risk of explosion or fire. Fire, open flames, andsmoking prohibited.

WARNING: System or material pressurized. Relieve pressure.Failure to observe may result in serious burns.

CAUTION: Failure to observe may result in equipmentdamage.

CAUTION: Hot surface. Failure to observe may result in burns.

2. Safety Symbols

Safety 1-3



“Qualified personnel” is defined here as individuals who thoroughlyunderstand the equipment and its safe operation, maintenance, andrepair. Qualified personnel are physically capable of performing therequired tasks, familiar with all relevant safety rules and regulations, andhave been trained to safely install, operate, maintain, and/or repair theequipment. It is the responsibility of the company operating theequipment to see that its personnel meet these requirements.

The unit is designed and intended to be used only for the purpose de-scribed in the Description section. Uses not in accordance with that sec-tion or as described in this document are considered unintended usesand not in accordance with governing regulations.

WARNING: Use of this equipment in ways other thandescribed in this document may result in personal injury, death,or equipment damage.

The following actions of the owner or operator of the unit are some, butnot all, examples of unintended use. Nordson will not be not responsiblefor personal injury or property damage resulting from such unintendeduse:

S Unapproved modifications or changes to the unit

S Failure to comply with the safety instructions

S Failure to comply with instructions concerning installation, use,operation, maintenance, or repair, or when these tasks are carried outby unqualified personnel

S Use of inappropriate or incompatible foreign materials or auxiliaryequipment

S Failure to observe workplace safety rules or regulations issued bygovernment authorities or safety councils

3. Qualified Personnel

4. Intended Use

Safety1-4



WARNING: Failure to follow the safety procedures can result ininjury or death.

S All electrical, pneumatic, gas, and hydraulic connections andinstallations of hot melt equipment may only be carried out byqualified personnel. Be sure to observe installation instructions forcomponents and accessories.

S Equipment must be properly grounded and fused according to itsrated current consumption (see ID plate).

S Cables which run outside the unit must regularly be checked for wearor damage.

S Power supply wire gauge and insulation must be sufficient to handlerated current consumption.

S Cables must never be squeezed or pinched. Do not locate cables orhoses in high traffic areas.

The unit should be operated by qualified personnel in accordance withthe instructions presented in this document.

WARNING: Failure to follow the safety procedures can result ininjury or death.

S Never allow the unit to be operated by personnel under the influenceof substances which reduce their reaction times, or who are not ableto operate the equipment for physical reasons.

S Prior to each start-up of the unit, check protection and warningdevices and make sure they are fully functional. Do not operate theunit if these devices are not functioning properly.

S When the removal of safety equipment is required for installation,maintenance, or repair of the unit, it must be re-connectedimmediately upon completion of the work.

S Prior to start-up of the unit, check to make sure all safety guards andsafety equipment are in place and functioning properly.

5. Installation and ElectricalConnections

6. Operation

Safety 1-5



S In a humid environment, only equipment featuring a correspondingclass of protection may be operated.

S Do not operate the unit in an explosive environment.

S Keep parts of the body or clothing away from rotating parts. Do notwear loose articles of clothing when operating or servicing units withrotating parts. Take off wrist watches, rings, necklaces, or similarpieces of jewelry and pin up or cover long hair before performing anywork on or with the unit.

S To carry out measurements on work pieces, switch off the unit andwait until it comes to a standstill.

S Never point hand guns or applicator nozzles at yourself or otherpersons.

WARNING: An operator or service technician working with theunit should be aware of less-obvious dangers that often cannotbe completely minimized at production sites:

S Exposed surfaces of the unit which cannot be practicallysafeguarded. They may be hot and take time to cool after the unit hasbeen operating.

S The possibility that electrical potentials may remain in the unit afterthe unit was de-energized

S Hot melt material and vapors

S Hydraulically or pneumatically operated parts of the unit

S Parts winding something up or down which are not covered

If the unit malfunctions, switch it off immediately.

S Turn the circuit breaker or main power switch OFF.

S Have the unit repaired by qualified personnel only.

6. Operation (contd.)

Less-obvious Dangers

Action in the Event of UnitMalfunction

Safety1-6



Contact with hot melt materials or hot areas of the unit may produce asevere skin burn.

WARNING: Hot! Risk of burns. Wear heat-protective clothing,safety goggles, and/or heat-protective gloves depending on thesymbols shown.

S Be extremely careful when using hot melt material. Even solidifiedmaterial may still be very hot.

S Always wear protective clothing which safely covers all exposed partsof the body.

In case of burns:

S Immediately cool affected skin areas using cold, clean water.

S Do not forcefully remove hot melt material from the skin.

S Immediately seek medical attention.

Allow only qualified personnel to perform the procedures described in thisdocument. When performing such tasks, wear protective clothing, andequipment.

WARNING: Even when the circuit breaker or main powerswitch is OFF, the unit is still electrically energized. Completethe following steps prior to maintenance or repair:

S Disconnect, lock out, and tag external power supply.

S To ensure the external power supply is disconnected, attempt tooperate the unit. If the unit does not energize, proceed withmaintenance or repair work.

S If the unit energizes, repeat the disconnect, lock out, and tagprocedure. Re-test the unit.

Danger of Burns

7. Maintenance/Repair

Safety 1-7



S Follow the specific instructions provided in this manual to relieve thesystem pressure in the entire unit.

S Secure pneumatically- or hydraulically-operated equipment againstuncontrolled movement.

S Only use parts which do not compromise the safety of the unit. Onlyuse genuine Nordson parts.

S Always use tools with insulated handles when removing or installingcomponents.

NOTE: Always refer to the material manufacturer’s Material Safety DataSheet (MSDS) or material information sheet before working with any ma-terial.

WARNING: Never clean any aluminum part or flush anysystem using halogenated hydrocarbon fluids. Examples ofcommon halogenated hydrocarbons are: dichloromethylene,1,1,1-trichloroethylene, and perchloroethylene. Halogenatedhydrocarbons may react violently with aluminum parts.

WARNING: Fire, open flame, and smoking are prohibited whencleaning fluids are used. Observe all explosion preventionregulations. Cleaning fluids may only be heated usingtemperature-controlled and explosion-protected heaters.

S Never use an open flame to clean the unit or components of the unit.

S Use only cleaning fluids designed or intended to be used with the hotmelt material being used in the unit. Never use paint fluids under anycircumstances.

S Note the flash point of the cleaning fluid used. Only use a controlledheating method to heat fluids.

S Ensure sufficient room ventilation to draw off generated vapors. Avoidprolonged breathing of vapors.

7. Maintenance/Repair(contd.)

8. Cleaning

Safety1-8



NOTE: Always refer to the material manufacturer’s Material Safety DataSheet (MSDS) or material information sheet before working with any hotmelt material.

S Ensure the work area is adequately ventilated.

S Do not exceed recommended processing temperatures. Doing socreates a danger to personnel due to decomposition of the material.

Dispose of equipment and materials used in operation and cleaningaccording to local regulations.

9. Thermoplastic Hot MeltMaterial

10. Equipment and MaterialDisposal


WM 302Issued 02/97


Section 2

Description

Description2-0


WM 302Issued 02/97


Description 2-1


WM 302Issued 02/97


Section 2Description

Model WM 302 pressure control units may be used to control proportionalvalves and/or adhesive pumps for Nordson adhesive guns. They can beused to process liquid adhesives and hot melts. Two outputs areintegrated with which to control pneumatic guns for continuos patternapplication. The pressure control units of the series WM 302 can be usedin combination with pattern control units from Nordson.

NOTE: Cold glue and other melting materials are referred to asadhesives in this manual. The pressure control unit is also referred to asthe controller.

The controller may not be used in an explosive atmosphere.

WARNING: Do not touch the contacts after disconnecting themains plug. Some of the unit’s electric components containresidual voltage in the form of a capacitive charge which canproduce a light electric shock when touched. The capacitivecharge disappears after approx. 60 seconds.

WARNING: When triggering the solenoid valves, adhesiveflows out of liquid adhesive guns. Danger of burns andspraying. Wear safety goggles and heat-protective gloves. Donot mount adhesive guns and program the unit at the sametime.

This danger is present especially:

S when starting up the production machine

S during inverted mode

S during manual mode

1. Intended Use

Unintended Use -Example-

2. Residual Risks

Description2-2


WM 302Issued 02/97


The WM 302 is a user-friendly pressure control unit. It is implemented tocontrol the pressure for proportional valves, adhesive pumps and electricpneumatic guns which are used for continuous application. The control isdependent on the speed of the production machine.

The unit can be operated easily via switches and potentiometers incombination with LEDs and a 7-segment display.

Please observe that your WALCOM equipment may slightly differ fromdescription or some informational details in the manual. Please refer tothe updated Bill of Material which is packed with your equipment.

The following figure shows the principle use of a WM 302 controller in acomplete system.

Adhesive is to be applied to a substrate (9). The production machinecarries the substrates via transport belt under the guns (7). When theproduction machine has reached a minimum speed, the WM 302 beginsapplying adhesive.

NOTE: In general, a production machine is a machine in whichNordson-WALCOM equipment for adhesive application is integrated (forexample, a packing machine). The term production machine means thesame as “parent machine” which may appear in other Nordson literature.

The encoder (6) is mechanically coupled via a gear box to the transportbelt of the production machine. It delivers one pulse per mm and isnecessary to calculate the speed.

After reaching the minimum speed set on the controller, the magneticvalve is activated. Constant air pressure is applied to the gun and thenozzle opens.

3. Introduction

Updated Bill of Material

4. Functioning

Description 2-3


WM 302Issued 02/97


Depending on the speed of the production machine, the proportionalvalve (2) is supplied with a current between 0 and 20 mA from thecontroller. This current controls the position of the diaphragm inside thepressure regulator (13). The adhesive is fed via the pump (14) from thecontainer (12) through the filter (15) to the pressure regulator (13).Depending on the position of the diaphragm in the pressure regulator, theadhesive arrives at the guns (7) with more or less pressure.

WM 302/01/A

ElectricCompressed airAdhesive

1 16

12

15

14

2

4

6

5

7

8

9

10

11

13

3

17

Fig. 2-1 Principle Drawing

1. Compressed air supply2. Proportional pressure control valve3. WM 302 (rear side)4. Compressed air line5. Connection cable magnetic valve6. Encoder

7. Adhesive gun8. Adhesive line9. Substrate

10. Adhesive pattern (applied)11. Transport belt12. Adhesive container

13. Adhesive pressure regulator14. Pump15. Filter16. Adhesive pattern (unapplied)17. Compressed air line

NOTE: Instead of the pump illustrated in this figure, it is possible toconnect a diaphragm pump or pressure container.

4. Functioning (contd.)

Description2-4


WM 302Issued 02/97


S 4-characters, 7-segment display, 5 LEDs and 2 selection switches foroperation and monitoring

S Automatic pressure control depending on the speed of productionmachine

S 1 regulator for adjusting the minimum speed (4 m/min to 300 m/min)at which the pressure control should start

S Production machine speed indicator (max. 600 m/min)

S Indicators for the minimum and maximum current of the outputs forproportional valves (0-20 mA)

S 2 potentiometers for adjusting the necessary currents (0-20 mA) forproportional valves

S 1 LED to indicate when the speed falls below the required minimumspeed

S 1 LED to indicate automatic and manual operation

S 1 LED to indicate defective/shortcircuited guns (when >1A)

S 1 LED for each proportional valve to indicate broken line ornon-connected valves

S 1 output for connection of 2 proportional valves (via distribution cable)

S 2 outputs for connection of electric pneumatic guns

S 1 input for connection of encoder

S Integrated power supply with automatically power adaptation between100 VAC and 240 VAC

Equipment Features

Description 2-5


WM 302Issued 02/97


WM302/02/A

1 6 975432 8 10 11

12

15

19

14

17

18

16

13

202729 26 212528 24 23 22

Fig. 2-2 Display- and Operating Elements

1. Display (7-segments)2. Position for pressure indication of

proportional valve 23. Position for pressure indication of

proportional valve 14. Position for minimum speed

indication5. Position for speed indication of

production machine6. Selection switch (A)7. LED (1) for automatic and man.

operation8. Symbol for automatic operation (left

position)9. Selection switch automatic / manual

operation (B)10. Middle position (without function)

11. Symbol for manual operation (rightposition)

12. Symbol for adhesive gun13. Alarm LED (2) for adhesive gun14. Alarm symbol for adhesive gun15. Alarm symbol for proportional valve116. Alarm LED (4) for proportional

valve117. Symbol for pressure adjustment of

proportional valves 1 and 218. Alarm LED (5) for proportional

valve 219. Alarm symbol for proportional

valve 220. Symbol for maximum pressure

21. Potentiometer (G) for maximumpressure (proportional valve 2)

22. Potentiometer (D) for maximumpressure (proportional valve 1)

23. Symbol for pressure adjustment ofproportional valves 1 and 2

24. Potentiometer (F) for minimumpressure (proportional valve 2)

25. Potentiometer (C) for minimumpressure (proportional valve 1)

26. Symbol for minimum pressure27. Potentiometer (E) for minimum

speed28. LED (3) indication when minimum

speed is too low29. Symbol for minimum speed

adjustment

NOTE: In the following sections, the switches and potentiometers on thefront of the pressure control unit are named in alphabetic orderselection switch / potentiometer (A), (B), (C)... beginning at the top left.The LEDs are referred to as LED (1), LED (2)... beginning at the top leftand moving to the right.

5. Front Side

Description2-6


WM 302Issued 02/97


WM302/03/A

1 2 43 5

689

10

7

Fig. 2-3 Connection Sockets and Operating Elements

1. Air vent2. Output for adhesive gun 13. Symbol for adhesive guns4. Output for adhesive gun 2

5. Mains switch6. Power connection unit7. Symbol for encoder8. Input for encoder

9. Output for proportional valve (viadistribution cable 2 connections arepossible)

10. Symbol for pressure outputs

6. Rear Side


WM 302Issued 02/97


Section 3

Installation

Installation3-0


WM 302Issued 02/97


Installation 3-1


WM 302Issued 02/97


Section 3Installation

WARNING: Allow only qualified personnel to perform thefollowing tasks. Observe and follow the safety instructions inthis document and all other related documentation.

Transport the unit so as to avoid damage. Do not throw the unit. Usesuitable packing materials such as styrofoam and sturdy cartons. SeeSection Specifications for weight.

Protect the unit from exposure to humidity, dust and vibrations.

Carefully unpack the unit to avoid damaging it. Check for damage causedduring transport.

Save the packing material for possible later use. Otherwise, recycle ordispose of properly according to local regulations.

1. Transport

2. Unpacking

Installation3-2


WM 302Issued 02/97


Protect the unit from humidity, excessive dust (observe IP class) andvibrations.

See Section Specifications for dimensions.

WM302/04/A1 2

Fig. 3-1 WM 302

1. Air vent 2. Mains switch

Switch off the mains switch (2, Fig. 3-1), then disconnect all electricalconnections from the controller.

Pack the unit in suitable packing materials such as styrofoam and sturdycartons. Protect from humidity, dust and extreme fluctuations intemperature (condensation).

Dispose of properly according to local regulations.

3. Setting Up

4. Removing

5. Storage

6. Disposal

WM302/05/A1

WM302/06/A

1

Installation 3-3


WM 302Issued 02/97


WARNING: WM 302 has a one-range power supply. It enablesthe unit to be operated with different line voltages (see powerconnection unit 1, Fig. 3-2).

1. Connect the power cable to the power connection unit on the rearside (1, Fig. 3-2).

2. Connect the power cable to the grounded power socket.

Fig. 3-2 Electrical Connections

1. Power connection unit

The control of adhesive pressure depends on the speed of the productionmachine. Therefore, an encoder has to be connected (1, Fig. 3-3). It iscoupled via a gear box to the production machine and supplies 1 pulseper mm.

Fig. 3-3 Electrical connections

1. Encoder

7. Electrical Connections

Mains Power

Encoder

WM302/07/A

11

WM302/08/A

1

Installation3-4


WM 302Issued 02/97


Opening and closing the adhesive guns is controlled by a magnetic valvewhich is triggered by the WM 302. The magnetic valve is mounted on thegun and connected to the controller (1, Fig. 3-4).


1. Adhesive guns

Adhesive can be fed to the guns by means of a pressure regulator by e.g.a connected container pump. The pressure regulator is controlled(increasing pressure at increasing speed) via a proportional valve whichis triggered by the output of the pressure controller (1, Fig. 3-5). Twoproportional valves can be connected via distribution cable at this output.


1. Proportional valve

Adhesive Gun

Proportional Valve

Installation 3-5


WM 302Issued 02/97


Required Accessories Socket

Encoder with cable 8

Cable for proportional valves 9

Adhesive gun with cable 2, 4

Power cable 6

WM302/09/A

2 4

689

Fig. 3-6

Accessories

Installation3-6


WM 302Issued 02/97


NOTE: The compressed air used should be filtered and dry. If only dampair can be used, a water separator or pneumatical device to removedampness should be used to prevent freezing.

Carry out the following steps for the initial setup:

1. Connect compressed air to air conditioning unit (1, Fig. 3-7).

2. Turn off the compressed air to the air conditioning unit (1, Fig. 3-7).

3. Connect compressed air to the container pump (17, Fig. 3-7).

4. Connect compressed air to the adhesive guns (4, Fig. 3-7).

5. Connect compressed air output of the proportional valve (2, Fig. 3-7)to the input of the pressure regulator (13, Fig. 3-7).

6. Connect adhesive output to pressure regulator, if not done before(15, Fig. 3-7).

7. Connect adhesive output of pressure regulator to adhesive gun(8, Fig. 3-7).

8. Connect electrical lines between WM 302 and adhesive gun(5, Fig. 3-7).

9. Connect electrical lines between WM 302 and proportional valves(2, Fig. 3-7).

10. Connect electrical lines between WM 302 and encoder (6, Fig. 3-7)and couple encoder via gear box to production machine.

11. Start production machine and determine minimum speed at whichproduction machine should operate.

12. Switch on WM 302 with mains switch (5, Fig. 2-3).

NOTE: The switches and potentiometers on the front of the pressurecontrol unit are named in alphabetic orderselection switch / potentiometer (A), (B), (C)... beginning at the top left.The LEDs are referred to as LED (1), LED (2)... beginning at the top leftand moving to the right.

13. Adjust the minimum speed for operation (the speed, when nozzlesopen) with potentiometer (E) on the WM 302. Do not decrease below4 m/min. LED (3) must go out.

8. Initial Setup

Installation 3-7


WM 302Issued 02/97


14. Release compressed air by slightly opening on the air conditioningunit (1, Fig. 3-7) (min. 6 bar).

15. Run minimum speed of production machine and adjust minimumpressure with potentiometer (C) for proportional valve 1, so that agood, even bead is produced. Repeat this step with potentiometer (F)for proportional valve 2.

16. Run maximum speed of production machine and adjust maximumpressure with potentiometer (D) for proportional valve 1, so that agood, even bead is produced. Repeat this step with potentiometer (G)for proportional valve 2 (if necessary, slow speed of productionmachine down). Lock adjusted parameters.

NOTE: If no convenient bead is produced, adjust minimum speed on theproduction machine and corresponding minimum pressure on thecontroller WM 302 until the bead is correct. If production machine runsbelow minimum necessary speed, pressure control does not occur.

WM 302/01/A

ElectricCompressed airAdhesive

1 16

12

15

14

2

4

6

5

7

8

9

10

11

13

3

17

Fig. 3-7

8. Initial Setup (contd.)

Installation3-8


WM 302Issued 02/97



WM 302Issued 02/97


Section 4

Operation

Operation4-0


WM 302Issued 02/97


Operation 4-1


WM 302Issued 02/97


Section 4Operation


WARNING: Danger of burns or spraying. When triggering thesolenoid valves, adhesive flows out of adhesive gun nozzles.Wear safety goggles and heat-protective gloves. Do not mountadhesive guns and program the unit at the same time.

This danger is present especially:

S when starting up the production machine

S during inverted mode

S during manual mode

NOTE: The switches and potentiometers on the front of the pressurecontrol unit are named in alphabetic orderselection switch / potentiometer (A), (B), (C)... beginning at the top left.The LEDs are referred to as LED (1), LED (2)... beginning at the top leftand moving to the right.

WM302/10/A

1

WM302/11/A

A

Operation4-2


WM 302Issued 02/97


Switch on the mains switch (1, Fig. 4-1).

Fig. 4-1 Mains switch

Switch off the mains switch (1, Fig. 4-1).

Switch off the mains switch (1, Fig. 4-1).

Operation of the controller is done by switches and potentiometers. Themeaning is described below.

The following parameters are displayed by turning theselection switch (A):

S Actual speed of production machine

S Adjusted minimum speed

S Adjusted minimum or maximum current for minimum and maximumpressure (in mA) for proportional valve 1 or 2

NOTE: All adjustments are also possible when the position ofselection switch (A) is not changed. We recommend turning the switch tothe corresponding position because the adjusted value is then indicated.

Fig. 4-2

1. Daily Startup

2. Daily Shutdown

3. Emergency Switch-Off

4. Adjustments

Mode Selection(Selection Switch A)

WM302/12/A

A

WM302/13/A

E 3

A

Operation 4-3


WM 302Issued 02/97


The speed of the production machine is the basis for calculating pressurevalues by the controller WM 302. Conditions for exact indications are:

S Installation of encoder (using a suitable gear box)

S Maximum speed above 600 m/min is not allowed

To indicate the speed of production machine, turn selection switch (A) tothe top position.

NOTE: For monitoring purposes, change the speed of the productionmachine and watch the display.

Fig. 4-3

Use potentiometer (E) to adjust the minimum speed to a setting belowwhich pressure control does not occur. Pneumatic guns do not openbelow this speed. When the production falls below the set speed, LED (3)lights.

1. Adjust the speed of the production machine as low as possible toprocess (not below 4 m/min).

2. Turn selection switch (A) to position minimum speed of productionmachine.

3. Adjust minimum speed on WM 302 via potentiometer (E).

4. Lock adjusted parameters at potentiometer (E).

NOTE: Take care that speed of production machine is a little higher thanadjusted minimum speed on the controller.

Fig. 4-4

NOTE: We recommend noting down all values in case of repeatproduction at a later date (see List of Adjustments at the end of thissection).

Indication of Production Speed

Adjusting Minimum Speed(Potentiometer E)

WM302/14/A

C

F

A

WM302/14/A

C

F

A

Operation4-4


WM 302Issued 02/97


Use the potentiometer (C) to adjust the minimum pressure forproportional valve 1. The minimum pressure is the pressure at which thelowest possible production machine speed is reached at which a usable,even adhesive bead is produced.

1. Slow down production machine as much as possible (not below4 m/min).

2. Turn selection switch (A) to position pressure indication.

3. Adjust the current for proportional valve 1 with potentiometer (C) untila usable bead is produced.

4. Lock adjusted parameters at potentiometer (C).

NOTE: Potentiometer (F) is used to adjust the minimum pressure forproportional valve 2. Therefore selection switch (A) has to be turned tothe bottom position.

Fig. 4-5

NOTE: We recommend noting down all values in case repeat productionat a later date (see List of Adjustments at the end of this section).

Use the potentiometer (D) to adjust the maximum pressure forproportional valve 1. The maximum pressure is the pressure which isrequired to produce a usable, even bead running highest speed aspossible.

1. Run up production machine as much as possible (not above600 m/min).

2. Turn selection switch (A) to position pressure indication.

3. Adjust the current for proportional valve 1 with potentiometer (D) untila usable bead is produced.

4. Lock adjusted parameters at potentiometer (D).

NOTE: Potentiometer (G) is used to adjust the maximum pressure forproportional valve 2. Therefore, selection switch (A) has to be turned tothe bottom position.

Fig. 4-6

NOTE: We recommend noting down all values in case repeat productionat a later date (see List of Adjustments at the end of this section).

Adjusting Minimum Pressure(Potentiometer C)

Adjusting Maximum Pressure(Potentiometer D)

WM302/16/A

B

WM302/17/A

1

Operation 4-5


WM 302Issued 02/97


Use selection switch (B) to select following modes:

Position Meaning

Left Automatic operation:Controller works using the adjusted parameters.

Middle Without function:Pressure control takes place. Connected pneumatic gunsare not activated. Nozzles do not open. Adhesive doesnot flow out. This position is e.g. to fill up the adhesivecontainer.

Right Manual operation:Connected guns open and adhesive flows out. Pressurecontrol also takes place when speed of productionmachine is changed. This position is forseen to run tests.

Fig. 4-7

One 7-segment display and 5 LEDs are available.

The display is used for:

S Indication of speed of production machine

S Indication of the minimum speed (in adjusting mode)

S Indication of minimum and maximum pressure for proportionalvalves (in adjusting mode)

Fig. 4-8

Change from Automatic toManual Operation(Selection Switch B)

5. Display / LEDs

Display

WM302/18/A

1 23

4 5

Operation4-6


WM 302Issued 02/97


The functions of the LED are:

LED Meaning

1 Lights up in automatic operation when necessary minimumspeed is reached; lights up in manual mode.

2 Lights up when a magnetic valve (valves mounted on theguns) is shortcircuited or a current > 1A flows.

3 Lights up when speed of the production machine decreasesthe minimum speed which is adjusted on the WM 302.

4 Lights up when connection of proportional valve 1 is notconnected or when connection is broken.

5 Lights when connection of proportional valve 2 is notconnected or when connection is broken.

Fig. 4-9

LEDs

Operation 4-7


WM 302Issued 02/97


This list should be used to note important parameters for production.Please copy before filling out.

Notes for production:Notes for production:

Adhesive: Fabricant:

Operating temperature:

Viscosity:

Cleaning material: Fabricant:

Flash point:

Pressures: Operating pressure:

Minimum pressure in mA for proportional valve 1:

Maximum pressure in mA for proportional valve 1:

Minimum pressure in mA for proportional valve 2:

Maximum pressure in mA for proportional valve 2:

Speeds: Minimum possible speed of production machine:

Maximum possible speed of production machine:

Adjusted minimum speed at WM 302:

Motor-/Pump rotations of adhesivefeeding equipment:

Comments:Comments:

Formula completed by: Name:

Date:

6. List of Adjustments

Operation4-8


WM 302Issued 02/97



WM 302Issued 02/97


Section 5

Maintenance / Troubleshooting / Repair

Maintenance / Troubleshooting / Repair5-0


WM 302Issued 02/97


Maintenance / Troubleshooting / Repair 5-1


WM 302Issued 02/97


Section 5Maintenance / Troubleshooting / Repair


The unit is maintenance-free. Check cables regularly for damage.Replace damaged cables immediately.

Problem Possible Cause Corrective Action Refer to

Unit does notfunction

Power plug not connected Connect the mains plug Installationfunction

Unit is not switched on Switch on the unit Operation

Mains fuse defective Check mains fuses, replace ifnecessary

Mainten./Troublesh./Repair

Gun does notapply

Gun does not open Magnetic valve of gun notconnected to WM 302

Installation

Select switch (B) not in left position Operation

Gun does notapply, LED (3) ison

Speed of production machine toolow

Increase speed of productionmachine

Operation

Gun does notapply, LED (2) ison

Magnetic valve at gun defective Change gun Installation

Gun applies toolow, LED (4)and/or (5) are on

Proportional valve defective or notconnected

Change proportional valve orconnect it

Installation

1. Maintenance

2. Troubleshooting



WM 302Issued 02/97



Bead too thinrunning a lowspeed

Current for minimal pressure toolow

Increase current Operation

Bead too thinrunning a highspeed

Current for maximal pressure toolow

Increase current Operation

Bead too thickrunning a lowspeed

Current for minimal pressure toohigh

Decrease current Operation

Bead too thickrunning a highspeed

Current for maximal pressure toohigh

Decrease current Operation

2. Troubleshooting (contd.)

Maintenance / Troubleshooting / Repair 5-3


WM 302Issued 02/97


NOTE: Repairs to be carried out by the customer are limited to changingdefective fuses. All other repairs may only be carried out by NordsonCustomer Service.

NOTE: Use only Nordson original spare parts.


Controller doesnot function

Mains plug not connected Connect the mains plug Installationnot function

Unit is not switched on Switch on the unit Operation

Mains fuse defective Check mains fuse, replace ifnecessary

below

1

3

2

4

WM302/19/A

Fig. 5-1 Mains switch and fuses

1. Mains switch2. Fuse bracket in inserted position

3. Fuse bracket 4. Cover

NOTE: The fuse can be dismounted sidewards.

3. Repair



WM 302Issued 02/97



WM 302Issued 02/97


Section 6

Parts

Parts6-0


WM 302Issued 02/97


Parts 6-1


WM 302Issued 02/97


Section 6Parts

NOTE: Use only Nordson original -spare parts.

Please observe that your WALCOM equipment may slightly differ fromdescription or some informational details in the manual. Please refer tothe updated Bill of Material which is packed with your equipment.

Part Description

371 622 Pressure control unit WM 302

371 297 Proportional valve compl.

371 193 Connection cable for proportional pressure control valve 5 m

371 194 Distributor for connection of 2 connection cables 371 193(necessary if more than 2 proportional valves are connected)

311 433 Encoder

311 453 Wheel for encoder, rubber

311 454 Wheel for encoder, wear resistant

313 365 Extension cable for encoder 5 m (196.8 in)

311 304 Connection cable for encoder

311 303 Connection cable for pneumatical adhesive guns

Part Description

312 158 Fuse 3,15 AT (for operating voltage 100 - 240 VAC)

1. WM 302 and Accessories

Updated Bill of Material

Fuse

Parts6-2


WM 302Issued 02/97



WM 302Issued 02/97


Section 7

Specifications

Specifications7-0


WM 302Issued 02/97


Specifications 7-1


WM 302Issued 02/97


Section 7Specifications

Operating voltage / Frequency 100 - 240 VAC, 0,6 A, 50/60 Hz

Encoder Voltage: 24 VDCInput : NPNRatio : 1 puls/mmInput ratio: 0-10 kHz

= 0-600 m/min

Current outputs forproportional valves

2 x 0-20 mAIndication of open outputs viaLED

Minimum speed adjustable from 4-300 m/minHysteresis: +/-- 0,5 m/min

Current outputs forpneumatical adhesive guns

0.8 AOvercurrent indication above1.0 A via LED

IP-Class IP 20

Dimensions H: 135 mm (8.45 inch)W: 260 mm (10.24 inch)D: 240 mm (5.31 inch)

Weight 2 kg (4.41 lbs)

Operating temperature 0 - 60 ˚C (32 - 140 ˚F)

Storage temperature --7 - 60 ˚C (20 - 140 ˚F)

1. General Data

WM302/20/A

4 1

3 2

WM302/21/A

4 1

3 2

WM302/22/A

1 3

2

Specifications7-2


WM 302Issued 02/97


PIN Function

1 Ground

2 +24 V

3 NPN

4 PE

Fig. 7-1 Input for Encoder

PIN Function

1 Ground

2 0-20 mA (P1)

3 0-20 mA (P2)

4 PE

Fig. 7-2 Output for ProportionalValve

PIN Function

1 +Output

2 Not connected

3 --Output

PE

Fig. 7-3 Output for Adhesive Gun

2. Connection Allocation

Encoder Input

Proportional Valve Outputs

Adhesive Gun Outputs

Specifications 7-3


WM 302Issued 02/97


WM302/23/A

Fig. 7-4 Dimensions in mm and inch

Note: The inner values are inches

3. Dimensions

Specifications7-4


WM 302Issued 02/97


pressure control unit wm 302 -...

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