104
Parallel connection of
LAF- Welding power
sources
Master
Installation manual
0449 335 074 2003--02--06
Slave
ENGLISH 3..............................................
Rights reserved to alter specifications without notice.
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ENGLISH
1SAFETY 4...........................................................
2 INTRODUCTION 6...................................................
2.1 General 6..................................................................
2.2 Setting of Switches and Bridges 7.............................................
2.3 Parallel connection kit 8......................................................
3 Location Drawing 9..................................................
3.1 Parallel connection kit - Welding Power Source LAF 635 9........................
3.2 Parallel connection kit - Welding Power Source LAF 800/1000 9...................
3.3 Parallel connection kit - Welding Power Source LAF 1250/1600 10..................
4 Connection in Parallel Using Six--Thyristor Operation 11................
DIAGRAM 12............................................................
SPARE PARTS LIST 15...................................................
TOCe
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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 precautions. 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 operation 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:
S its operation
S location of emergency stops
S its function
S relevant safety precautions
S welding
2. The operator must ensure that:
S no unauthorised person is stationed within the working area of the equipment when it is
started up.
S no--one is unprotected when the arc is struck
3. The workplace must:
S be suitable for the purpose
S be free from draughts
4. Personal safety equipment
S Always wear recommended personal safety equipment, such as safety glasses, flame--proof
clothing, safety gloves.
S Do not wear loose--fitting items, such as scarves, bracelets, rings, etc., which could become
trapped or cause burns.
5. General precautions
S Make sure the return cable is connected securely.
S Work on high voltage equipment may only be carried out by a qualified electrician.
S Appropriate fire extinquishing equipment must be clearly marked and close at hand.
S Lubrication and maintenance must not be carried out on the equipment during operation.
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GB
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 MANUFACTURERS’ HAZARD DATA.
ELECTRIC SHOCK -- Can kill
S Install and earth the welding unit in accordance with applicable standards.
S Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing.
S Insulate yourself from earth and the workpiece.
S Ensure your working stance is safe.
FUMES AND GASES -- Can be dangerous to health
S Keep your head out of the fumes.
S Use ventilation, extraction at the arc, or both, to take fumes and gases away from your breathing zone
and the general area.
ARC RAYS -- Can injure eyes and burn skin.
S Protect your eyes and body. Use the correct welding screen and filter lens and wear protective
clothing.
S Protect bystanders with suitable screens or curtains.
FIRE HAZARD
S Sparks (spatter) can cause fire. Make sure therefore that there are no inflammable materials nearby.
NOISE -- Excessive noise can damage hearing
S Protect your ears. Use earmuffs or other hearing protection.
S Warn bystanders of the risk.
MALFUNCTION -- Call for expert assistance in the event of malfunction.
READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE INSTALLING OR OPERATING.
PROTECT YOURSELF AND OTHERS!
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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 11.
Master Slave
Connection in Parallel of Welding Power Sources
oftheSameSize
Master Slave
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.
Master
Slave
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.
*1 Max = 1600 A
*2 500+500 = 1000 A
Master 500 A Slave 500 A
Current Outlet for Welding Power Sources of Different Size
If the Welding power sources are of different size the Master will be charged at 80%
before the Slave is connected. This distribution is done automatically by the welding
power sources.
*1 Max = 2050 A
*2 800+200 = 1000 A
Master 800 A
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Slave 200 A
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