ESAB LAF Series User manual

0449 546 001 110217

Parallel connection of

LAF-welding power source

Instruction manual

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Rights reserved to alter specifications without notice.

ENGLISH 3..............................................

ENGLISH

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TOCe

1SAFETY 4...........................................................

2 INTRODUCTION 7...................................................

2.1 General 7..................................................................

2.2 Connection instructions for two parallel-connected welding

power sources and one PEK control box 8......................................

3 Location Drawing 9..................................................

3.1 Location drawing - Welding Power Source LAF 631 9............................

3.2 Location drawing - Welding Power Source LAF 1001 10...........................

3.3 Location drawing - Welding Power Source LAF 1251/1601 11......................

4 Connection in Parallel Using Six-Thyristor Operation 12................

DIAGRAM 14............................................................

SPARE PARTS LIST 17..................................................

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SafeArcW GB

1SAFETY

Users of ESAB welding equipment have the ultimate responsibility for ensuring that

anyone who works on or near the equipment observes all the relevant safety pre-

cautions. Safety precautions must meet the requirements that apply to this type of

welding 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 oper-

ation of the welding 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 welding equipment must be familiar with:

Sits operation

Slocation of emergency stops

Sits function

Srelevant safety precautions

Swelding

2. The operator must ensure that:

Sno unauthorised person is stationed within the working area of the

equipment when it is started up.

Sno-one is unprotected when the arc is struck

3. The workplace must:

Sbe suitable for the purpose

Sbe free from draughts

4. Personal safety equipment

SAlways wear recommended personal safety equipment, such as safety

glasses, flame-proof clothing, safety gloves. Note! Do not use safety

gloves when replacing wire.

SDo not wear loose-fitting items, such as scarves, bracelets, rings, etc.,

which could become trapped or cause burns.

5. General precautions

SMake sure the return cable is connected securely.

SWork on high voltage equipment may only be carried out by a qualified

electrician.

SAppropriate fire extinquishing equipment must be clearly marked and close

at hand.

SLubrication and maintenance must not be carried out on the equipment

during operation.

WARNING

ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND

OTHERS. TAKE PRECAUTIONS WHEN WELDING. ASK FOR YOUR

EMPLOYER'S SAFETY PRACTICES WHICH SHOULD BE BASED ON MANU-

FACTURER'S HAZARD DATA.

ELECTRIC SHOCK - Can kill

SInstall and earth the welding unit in accordance with applicable standards.

SDo not touch live electrical parts or electrodes with bare skin, wet gloves or wet

clothing.

SInsulate yourself from earth and the workpiece.

SEnsure your working stance is safe.

FUMES AND GASES - Can be dangerous to health

SKeep your head out of the fumes.

SUse ventilation, extraction at the arc, or both, to keep fumes and gases from

your breathing zone and the general area.

ARC RAYS - Can injure eyes and burn skin

SProtect your eyes and body. Use the correct welding screen and filter lens and

wear protective clothing.

SProtect bystanders with suitable screens or curtains.

FIRE HAZARD

SSparks (spatter) can cause fire. Make sure therefore that there are no inflam-

mable materials nearby.

NOISE - Excessive noise can damage hearing

SProtect your ears. Use ear defenders or other hearing protection.

SWarn bystanders of the risk.

MALFUNCTION

SCall for expert assistance in the event of malfunction.

PROTECT YOURSELF AND OTHERS!

READ AND UNDERSTAND THE INSTRUCTION MAN-

UAL BEFORE INSTALLING OR OPERATING.

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SafeArcW GB

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SafeArcW GB

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 electromagnic

compatibility of class A equipment in those locations, due to conducted

as well as radiated disturbances.

CAUTION!

WARNING!

Read and understand the instruction

manual before installing or operating.

Do not dispose of electrical equipment together with normal waste!

In observance of European Directive 2002/96/EC on Waste Electrical and Electronic

Equipment and its implementation in accordance with national law, electrical equipment

that has reached the end of its life must be collected separately and returned to an

environmentally compatible recycling facility. As the owner of the equipment, you should

get information on approved collection systems from our local representative.

By applying this European Directive you will improve the environment and human health!

CAUTION!

The welding power source and control box PEH can't be used together.

Master Slave

Master

Slave

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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 Master and Slave.

It is possible to use the so-called six-thyristor

effect by inverting the primary terminal of the

main transformer, see page 12.

Connection in Parallel of Welding Power Sources

oftheSameSize

Connection in Parallel of Welding Power Sources

of Different Size

When the welding power sources are of different size

the smallest one is to be Master.

Current Outlet for Welding Power Sources of the Same Size

If the power sources are of the same size the current outlet will be evenly distributed.

Master 500 A Slave 500 A

*1 Max = 1600 A

*2 500+500 = 1000 A

Current Outlet for Welding Power Sources of Different Sizes

If the Welding power sources are of different sizes the current outlet will be

procentually evenly distributed.

Master 500 A Slave 300 A

*1 Max = 1000+600= 1600 A

*2 500+300 = 800 A

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2.2 Connection instructions for two parallel-connected welding

power sources and one PEK control box

1. Emergency stop coil W01, is connected together with the enclosed contact block,

which in turn has been fitted on KM2, in accordance with the diagram on page

14 (automatic welding machine) or page 15 (automation).

2. On the welding power source defined as Slave CN18 (pin 1 and 2), on AP1, shall

be clamped for analogue control.

3. Start up both welding power sources and connect ESAT to the Master welding

power source.

4. Set parameter 762 to 1, Master searches for the welding power source selected

as Slave.

5. Set parameter 767 to 10, Node address on the welding power source selected

as Slave.

6. Move the ESAT connection to the welding power source defined as Slave.

7. Set parameter 10 to 16, Slave function.

8. Set parameter 67 to 0, with value 1 so the welding power source expects an

analogue signal.

9. Set parameter 712 to 0, the wire feed is not controlled by the welding power

source defined as Slave.

10. Set parameter 713 to 0, the travel motor is not controlled by the welding power

source defined as Slave.

11. Set parameter 762 to 0, Slave does not search for another power source.

12. Set parameter 767 to 2, Node address on the welding power source defined as

Master.

13. Set parameter 9000 to 10, Node address for the welding power source defined

as Slave.

14. Switch off the voltage to both welding power sources.

15. Remove the clamp on CN18 (pin 1 and 2) on the Slave welding power source.

16. Remove the clamp on CN11 on the Master welding power source.

17. Connect cable W02 to the welding power sources.

18. Switch on the voltage to the Slave welding power source.

19. Switch on the voltage to the Master welding power source.

20. Check that the emergency stop coil is working, both the welding power sources

(emergency stop relay/emergency stop contactors) are switched off. After

resetting, the welding power sources start up normally and are ready for use.

21. Check that the parallel current value can be set in PEK.

For more information on component location on the circuit board, see the service

manual for the LAF welding power source.

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3 Location Drawing

3.1 Location drawing - Welding Power Source LAF 631

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3.2 Location drawing - Welding Power Source LAF 1001

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