18 Troubleshooting Guide
Spiral is dirty. Clean the spiral.
Channels of the drive reels are
not compatible with wire type or
diameter being used.
Check the channels of reels and
change with the reels suitable for
the used wire. Clean the grooves.
Channels of drive reels are worn
or grooves are crushed.
Replace worn reels with the new
ones.
Welding wire jammed in contact
nozzle.
Remove the welding wire from
contact nozzle Replece the contact.
nozzle if necessary.
Wire feed engine is faulty. Contact with technical service.
Control board (PC-board) is faulty.
Contact with technical service.
Control cable (multiple cable) is
faulty.
Change the control cable.
Trigger of welding torch is faulty.
Replace the trigger of welding torch.
Problem in energy inlet.
Check the power unit and mains
supply connection. Turn on the
machine if it is closed. If inlet fuse
blown, change the fuse.
REASON SOLUTIONPROBLEM
Control board (PC-board) is faulty. Contact with technical service.
Control cable (multiple cable) is
faulty.
Change the control cable.
Current setting potentiometer is
faulty.
Change the potentiometer.
There is no energy in AC Contact with technical service.
Control board (PC-board) is faulty. Contact with technical service.
There is wire feeding
and gas flow, but
there is no open
circuit voltage.
Supply voltage value is too low
(under 350 V).
Check the supply voltage as to be
380 10%V.±
One of the phases is missing in
supply voltage.
Check the mains phases.
Open circuit voltage
is low.
Diode gropu is faulty.
Change the diode group.
There is disconnection in
grounding cable.
Check the grounding cable
connection.
There is too much oil, dirt and
rust on workpiece. The contact
between work clamp and
workpiece is not good.
Provide good contact between the
surfaces by performing necessary
cleaning.
There is open circuit
voltage and wire
feeding function
operates. But there
is no arc.
Expressweld MasterMIG 500W
Page 32
There is problem
in wire feeder
unit, engine
operates but wire
does not
advance
properly.
Grooves are dirty.
There is problem in
wire feeder unit,
engine doesn t
operate. When
pressed on torch
trigger, wire doesn t
advance.
'
'
There is open circuit
voltage and gas
flow, but wire
feeding functions
doesn t operate.'
contactor coil.
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