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).
1.2Safety 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
•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.
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.
0449 546 201
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
•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.
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.
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", page12.
1. Primary2. Secondary
Current outlet for welding power sources
The current outlet will be procentually evenly distributed.
1. Primary3. Max = 1000+600= 1600 A
2. Secondary4. 500+300 = 800 A
2.2Connection 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", page16.
1) On the secondary power sources, connect the jumper CN18 for analogue control, jumper pins 1
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.
4 CONNECTION IN PARALLEL USING SIX-THYRISTOR
OPERATION
4CONNECTION 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. Primary2. Secondary
•The phase shift goes down from 120° to 60°, see the diagrams below.
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. Primary3. 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.