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4.2 PRECAUTIONS AFTER REPAIRS
After making repairs, take care to organize the wiring
so that there is secure insulation between the primary
and secondary sides of the machine. Do not allow the
wires to come into contact with moving parts or those
that heat up during operation. Reassemble all clamps
4.3 TROUBLESHOOTING & SERVICE
Problems with inconsistent wire feed:
Wire feeding problems can be reduced by checking the following points:
MIG WELDING
Fault
Feed roller driven by motor in the
cabinet slipped.
Wire spool unwinded and tangled.
Worn or incorrect feed roller size
Wire rubbed against the mis-aligned
guides and reduced wire feedability.
Liner blocked with swarf.
Incorrect or worn contact tip
Poor work lead contact to work piece.
Bent liner.
TIG WELDING
Fault
Mains supply voltage is ON, power
indicator is illuminated however unit
will not commence welding when the
torch trigger switch is depressed.
24
INVERTER WELDER WK MULTIMIG 2140
as they were on the original machine, to prevent a
connection from occurring between the primary and
secondary circuits should a wire accidentally break or
be disconnected. Also mount the screws with geared
washers as on the original machine.
Cause
Wire spool brake is too tight.
Wire spool brake is too loose.
Use a feed roller matched to the size you are welding.
Replace feed roller if worn.
Mis-alignment of inlet/outlet guides.
Increased amounts of swarf are produced by the wire passing through the feed
roller when excessive pressure is applied to the pressure roller adjuster.
Swarf can also be produced by the wire passing through an incorrect feed
roller groove shape or size.
Swarf is fed into the conduit liner where it accumulates thus reducing wire
feedability.
The contact tip transfers the weld current tot he electrode wire. If the hole
in the contact tip is too large then arcing may occur inside the contact tip
resulting in the wire jamming in the contact tip.
When using soft wire such as aluminium it may become jammed in the contact
tip due to expansion of the wire when heated.
If the work lead has a poor electrical contact to the work piece then the
connection point will heat up and result in a reduction of power at the arc.
This will cause friction between the wire and the liner thus reducing wire
feedability.
Cause
Power source is not in the correct
mode of operation.
Faulty torch trigger.
Remedy
Set the power source to the correct
mode of operation with the process
selection switch.
Repair or replace torch trigger
switch/lead.
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