ESAB Parallel connection Instruction manual

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Parallel connection

LAF-welding power source

Instruction manual

0449 546 201  GB  20221102

1 SAFETY

1.1 Meaning of symbols

1.2 Safety precautions

2 INTRODUCTION

2.1 General

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2.2 Connection instruction for two power sources in parallel

3 LOCATION DRAWING

3.1 Location drawing - Welding power source LAF 631

3.2 Location drawing - Welding power source LAF 1001

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3.3 Location drawing - Welding power source LAF 1251/1601

4 CONNECTION IN PARALLEL USING SIX-THYRISTOR OPERATION

DIAGRAM

SPARE PARTS LIST

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1  SAFETY

1 SAFETY

1.1 Meaning of symbols

As used throughout this manual: Means Attention! Be Alert!

DANGER! Means immediate hazards which, if not avoided, will result in immediate, serious personal injury or loss of life.

WARNING! Means potential hazards which could result in personal injury or loss of life.

CAUTION! Means hazards which could result in minor personal injury.

WARNING!

Before use, read and understand the instruction manual and follow all labels, employer´s safety practices and Safety Data Sheets (SDSs).

1.2 Safety precautions

Users of ESAB equipment have the ultimate responsibility for ensuring that anyone who works on or near the equipment observes all the relevant safety precautions. Safety precautions must meet the requirements that apply to this type of equipment. The following recommendations should be observed in addition to the standard regulations that apply to the workplace.

All work must be carried out by trained personnel well-acquainted with the operation of the equipment. Incorrect operation of the equipment may lead to hazardous situations which can result in injury to the operator and damage to the equipment.

1. Anyone who uses the equipment must be familiar with:

• its operation

• location of emergency stops

• its function

• relevant safety precautions

• welding and cutting or other applicable operation of the equipment

2. The operator must ensure that:

• no unauthorised person is stationed within the working area of the equipment when it is started up

• no-one is unprotected when the arc is struck or work is started with the equipment

3. The workplace must:

• be suitable for the purpose

• be free from drafts

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1  SAFETY

4. Personal safety equipment:

• Always wear recommended personal safety equipment, such as safety glasses, flame-proof clothing, safety gloves

• Do not wear loose-fitting items, such as scarves, bracelets, rings, etc., which could become trapped or cause burns

5. General precautions:

• Make sure the return cable is connected securely

• Work on high voltage equipment may only be carried out by a

qualified electrician

• Appropriate fire extinguishing equipment must be clearly marked and close at hand

• Lubrication and maintenance must not be carried out on the equipment during operation

WARNING!

Wire feeders are intended to be used with power sources in MIG/MAG mode only.

If used in any other welding mode, such as MMA, the welding cable between wire feeder and power source must be disconnected, or else the wire feeder becomes live or energized.

If equipped with ESAB cooler

Use ESAB approved coolant only. Non-approved coolant might damage the equipment and jeopardize product safety. In case of such damage, all warranty undertakings from ESAB cease to apply.

Recommended ESAB coolant ordering number: 0465720002.

For ordering information, see the "ACCESSORIES" chapter in the instruction manual.

WARNING!

Arc welding and cutting can be injurious to yourself and others. Take precautions when welding and cutting.

ELECTRIC SHOCK - Can kill

• Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing

• Insulate yourself from work and ground.

• Ensure your working position is safe

ELECTRIC AND MAGNETIC FIELDS - Can be dangerous to health

• Welders having pacemakers should consult their physician before welding. EMF may interfere with some pacemakers.

• Exposure to EMF may have other health effects which are unknown.

• Welders should use the following procedures to minimize exposure to EMF: ○ Route the electrode and work cables together on the same side

of your body. Secure them with tape when possible. Do not place your body between the torch and work cables. Never coil the torch or work cable around your body. Keep welding power source and cables as far away from your body as possible.

○ Connect the work cable to the workpiece as close as possible

to the area being welded.

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FUMES AND GASES - Can be dangerous to health

• Keep your head out of the fumes

• Use ventilation, extraction at the arc, or both, to take fumes and gases away from your breathing zone and the general area

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1  SAFETY

ARC RAYS - Can injure eyes and burn skin

• Protect your eyes and body. Use the correct welding screen and filter lens and wear protective clothing

• Protect bystanders with suitable screens or curtains

NOISE - Excessive noise can damage hearing

Protect your ears. Use earmuffs or other hearing protection.

MOVING PARTS - Can cause injuries

• Keep all doors, panels and covers closed and securely in place. Have only qualified people remove covers for maintenance and troubleshooting as necessary. Reinstall panels or covers and close doors when service is finished and before starting engine.

• Stop engine before installing or connecting unit.

• Keep hands, hair, loose clothing and tools away from moving parts.

FIRE HAZARD

• Sparks (spatter) can cause fire. Make sure therefore that there are no inflammable materials nearby

• Do not use on closed containers.

HOT SURFACE - Parts can burn

• Do not touch parts bare handed.

• Allow cooling period before working on equipment.

• To handle hot parts, use proper tools and/or insulated welding gloves to prevent burns.

MALFUNCTION - Call for expert assistance in the event of malfunction.

PROTECT YOURSELF AND OTHERS!

CAUTION!

This product is solely intended for arc welding.

CAUTION!

Class A equipment is not intended for use in residential locations where the electrical power is provided by the public low-voltage supply system. There may be potential difficulties in ensuring electromagnetic compatibility of class A equipment in those locations, due to conducted as well as radiated disturbances.

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1  SAFETY

NOTE! Dispose of electronic equipment at the recycling facility!

In observance of European Directive 2012/19/EC on Waste Electrical and Electronic Equipment and its implementation in accordance with national law, electrical and/or electronic equipment that has reached the end of its life must be disposed of at a recycling facility.

As the person responsible for the equipment, it is your responsibility to obtain information on approved collection stations.

For further information contact the nearest ESAB dealer.

ESAB has an assortment of welding accessories and personal protection equipment for purchase. For ordering information contact your local ESAB dealer or visit us on our website.

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2  INTRODUCTION

2 INTRODUCTION

2.1 General

Connection in parallel can be done with all sizes of the LAF welding power source. The current outlet from each welding power source depends on its size, see below.

The mains connection is to be done in the same way for primary and secondary.

It is possible to use the so-called six-thyristor effect by inverting the primary terminal of the main transformer, see Section 4 "Connection in parallel using six-thyristor operation", page12.

1. Primary 2. Secondary

Current outlet for welding power sources

The current outlet will be procentually evenly distributed.

1. Primary 3. Max = 1000+600= 1600 A

2. Secondary 4. 500+300 = 800 A

2.2 Connection instruction for two power sources in parallel

Before the definition of the power supplies, the emergency stop chain should be linked together by cable W01, see Section 5.1 "DIAGRAM", page16.

1) On the secondary power sources, connect the jumper CN18 for analogue control, jumper pins 1

and 2.

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2  INTRODUCTION

2) Start up the power sources and connect ESAT to the secondary power source you want to set up.

Repeat this for all connected secondary power sources:

Set the secondary node ID using service function 30 (assign node address). For secondary 1, set address 10, for secondary 2, set address 18 and for secondary 3, set address 26.

3) Turn off both power sources and remove jumper CN18 on the secondary power source.

4) Remove jumper CN11 on the master power source and on all except for the last of the secondary

power sources.

5) Connect cable W02.

6) Start the power sources, first the secondary/secondaries, then the primary.

7) Make sure the emergency stop chain works, i.e. that all power sources shut down and start up

normally.

8) Verify that the parallel current value can be set in PEK.

NOTE!

You don’t need the reference cable to the secondary/secondaries. The jumper CN18 on the secondary/secondaries should be removed.

The activation of parallell welding is done in the PEK.

When the function is activated and the primary has found the secondary/secondaries, an indication is shown in the PEK display.

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3  LOCATION DRAWING

3 LOCATION DRAWING

3.1 Location drawing - Welding power source LAF 631

1. Primary 2. Secondary

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3  LOCATION DRAWING

3.2 Location drawing - Welding power source LAF 1001

1. Primary 2. Secondary

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3  LOCATION DRAWING

3.3 Location drawing - Welding power source LAF 1251/1601

1. Primary 2. Secondary

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4  CONNECTION IN PARALLEL USING SIX-THYRISTOR OPERATION

4 CONNECTION IN PARALLEL USING

SIX-THYRISTOR OPERATION

In this case the primary/secondary welding power sources are connected to the mains by way of six thyristors (three in each welding power source). This results in softer welding current as the phase shift is 60° instead of 120° .

• Connection of primary+secondary using the six-thyristor effect. Note that the primary

winding of the secondary is reversed.

1. Primary 2. Secondary

• The phase shift goes down from 120° to 60°, see the diagrams below.

1. Primary 3. Primary+secondary

2. Secondary

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4  CONNECTION IN PARALLEL USING SIX-THYRISTOR OPERATION

• The following sine-wave diagram shows the equalising effect obtained when using

inversion of the secondary transformer.

1. Primary 3. Primary+secondary

2. Secondary

The requirement is that the welding power sources are of the same size, and that it is possible to shift the input and output on the primary side of the main transformer. This is easily done on LAF 1001, 1251 and 1601, whereas it is more complicated on LAF 631, as the winding of the transformer is connected directly to the main contactor.

NOTE!

In the case of three secondary power sources, one of them shall be connected in the same way as the primary and the two other as shown for the secondary.

Important

Connect the right winding. Most power sources have more than one mains voltage. This applies particularly to machines designed for different mains voltages.

Below you find examples how to connect primary and secondary to the mains when using power sources without multivoltage connections.

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4  CONNECTION IN PARALLEL USING SIX-THYRISTOR OPERATION

Figure 19: LAF 631

1. Primary 2. Secondary

Figure 20: LAF 1001

1. Primary 2. Secondary

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4  CONNECTION IN PARALLEL USING SIX-THYRISTOR OPERATION

Figure 21: LAF 1251/1601

1. Primary 2. Secondary

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APPENDIX

DIAGRAM

Figure 22: Tractor variant

1. Primary 2. Secondary

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APPENDIX

Figure 23: Automation variant

1. Primary 2. Secondary

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APPENDIX

SPARE PARTS LIST

Ordering no. Denomination Notes

0808573882 Parallel connection kit

Item no. Qty Ordering no. Denomination Notes

0808573882 Parallel connection kit LAF-PEK

W01 4 0801389053 Cable 4x2x0.5, liycy

W02 1 0458681908 Cable L=4 m

1 0436919007 Auxillary contact block

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APPENDIX

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ESAB AB, Lindholmsallén 9, Box 8004, 402 77 Gothenburg, Sweden, Phone +46 (0) 31 50 90 00

http://manuals.esab.com

For contact information visit http://esab.com

ESAB Parallel connection Instruction manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

1 SAFETY

1.1 Meaning of symbols

1.2 Safety precautions

2 INTRODUCTION

2.1 General

2.2 Connection instruction for two power sources in parallel

3 LOCATION DRAWING

3.1 Location drawing - Welding power source LAF 631

3.2 Location drawing - Welding power source LAF 1001

3.3 Location drawing - Welding power source LAF 1251/1601

DIAGRAM

SPARE PARTS LIST