57
Maintenance and Troubleshooting - 4
PROBLEM
POSSIBLE REASON
SOLUTION
No gas flow (TIG)
Gas always flows
The adjustment knob of pre-gas time on
the front panel is damaged
The welding current potentiometer on
the front panel connection is not good
or damaged
The welding current
can not be adjusted
The penetration of
molten pool is not
enough.
The welding current
displayed isn’t
accordant with the
actual value.
The alarm lamp on
the front panel is on
Open or change the gas cylinder
Remove it
The gas-test on the front panel
is off
Increase the welding current
Remove it
Use 2T operation
Change it
Change it
Change it. Contact to the service
if necessary.
Contact to the service.
Gas cylinder is close or gas pressure
is low
Something in the valve
The gas-test on the front panel is on
The welding current is adjusted too low
Something in the valve
The arc is too long in the welding
process
Electromagnetic valve is damaged
Electromagnetic valve is damaged
The min value displayed isn’t accordant
with the actual value.
(Please refer to §3.1)
Working time
too long
Over heat
protection
Unusual current
in the main circuit
Over-current
protection
Power supply
fluctuates
Over-voltage
protection
Power supply
fluctuates
Too many
machines using
power supply in
the same time
Low-voltage
protection
The max value displayed isn’t accordant
with the actual value.
(Please refer to §3.1)
Adjust potentiometer Imin on the
power board.
Reduce the duty cycle
(work intermittently)
Contact to the service.
Using the stable power supply
Using the stable power supply
Reduce the machines using
power supply in the same time
Adjust potentiometer Imax on the
power board.
U
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MAN
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