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Expressweld MasterMIG 250CT
18 Troubleshooting Guide
PROBLEM
REASON
Spiral is dirty.
Channels of the drive reels are
not compatible with wire type or
diameter being used. Grooves
There is problem
are dirty.
in wire feeder
system, engine
Channels of drive reels are worn
operates but wire
or grooves are crushed.
does not advance
Welding wire jammed in contact
properly.
nozzle.
Trigger of welding torch is faulty.
There is problem in
Wire feed engine is faulty.
wire feeder unit,
Control board (PC-board) is faulty. Contact with technical service.
engine doesn't
operate. When
Problem in energy inlet.
pressed on torch
trigger, wire doesn't
advance.
Control board (PC-board) is faulty. Contact with technical service.
There is open circuit
voltage and gas flow,
Current setting potentiometer
but wire feeding
is faulty.
functions doesn't
operate.
There is no energy in AC
There is wire feeding
contactor coil.
and gas flow, but
there is no open
Control board (PC-board) is faulty. Contact with technical service.
circuit voltage.
Supply voltage value is too low
(under 350 V).
Open circuit
One of the phases is missing in
voltage is low.
supply voltage.
Diode gropu is faulty.
There is disconnection in
There is open circuit
grounding cable.
voltage and wire
There is too much oil, dirt and
feeding function
ve pas var. rust on workpiece.
operates. But there
The contact between work clamp
is no arc.
and workpiece is not good.
SOLUTION
Clean the spiral.
Check the channels of reels and
change with the reels suitable for
the used wire. Clean the grooves.
Replace worn reels with the new
ones.
Remove the welding wire from
contact nozzle. Replace the contact
nozzle if necessary.
Replace the trigger of welding torch.
Contact with technical service.
Check the power unit and mains
supply connection. Turn on the
machine if it is closed. If inlet fuse
is blown, change the fuse.
Change the potentiometer.
Contact with technical service.
Check the supply voltage as to be
380 ±10%V.
Check the mains phases.
Change the diode group.
Check the grounding cable
connection.
Provide good contact between the
surfaces by performing necessary
cleaning.
Page 31
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