57
Maintenance and Troubleshooting - 4
The alarm lamp on
the front panel is on
Working time
too long
Two much
welding current
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
Reduce the duty cycle
(work intermittently)
Reduce the welding current
output
Contact to the service.
Using the stable power supply
Using the stable power supply
Reduce the machines using
power supply in the same time
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 welding current
displayed isn’t
accordant with the
actual value.
The gas-test on the front panel
is off
Remove it
Change it
Change it. Contact to the service
if necessary.
Contact to the service.
The gas-test on the front panel is on
Something in the valve
The penetration of
molten pool is not
enough.
Increase the welding current
Use 2T operation
The welding current is adjusted too low
The arc is too long in the welding
process
Electromagnetic valve is damaged
The min value displayed isn’t accordant
with the actual value.
(Please refer to §3.1)
The max value displayed isn’t accordant
with the actual value.
(Please refer to §3.1)
Adjust potentiometer Imin on the
power board.
Adjust potentiometer Imax on the
power board.
No AC output while
selecting “AC”
Contact to the service.
Contact to the service.
Contact to the service.
The power PCB is in trouble.
The AC drive PCB damaged.
The AC IGBT module damaged.
PROBLEM
POSSIBLE REASON
SOLUTION
U
S
E
R
MAN
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Summary of Contents for Inverter 205-TIG AC/DC
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