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.
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 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
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.
GB

Master Slave
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
GB

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hga7d1ea
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.
GB

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3 Location Drawing
3.1 Location drawing - Welding Power Source LAF 631
GB

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3.2 Location drawing - Welding Power Source LAF 1001
GB

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3.3 Location drawing - Welding Power Source LAF 1251/1601
GB

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4 Connection in Parallel Using Six-Thyristor Operation
In this case the Master/Slave 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°.
SConnection of Master+Slave using the six-thyristor effect. Note that the primary
winding of the Slave is reversed.
SThe phase shift goes down from 120°to 60°, see the diagrams below.
SThe following sine-wave diagram shows the equalising effect obtained when
using inversion of the Slave transformer.
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.
GB

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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 master and slave to the mains when using
power sources without multivoltage connections.
GB

DIAGRAM
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hga7diag
Tractor variant

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hga7diag
Automation variant

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sida

SPARE PARTS LIST
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SpareFram
Edition 101001
Ordering no. Denomination Notes
0808573882 Parallel connection kit

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sida

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h808753s
Item
no. Qty Ordering no. Denomination Notes
0808573882 Parallel connection kit LAF-PEK
W01 40801389053 Cable 4x2x0.5, liycy
W02 10458681908 Cable L=4 m
10436919007 Auxillary contact block

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