WeldKing COOLTIG220 - Page 30

Manual no. WDT90100 Page 27
CoolTig - 220
3 protection light on Work excess the rate duty circle Use under
rate duty circle
Input voltage is too high or too
low
Use under
rated input
voltage
Abnormal current in the main
circuit
Check and
repair the
main circuit
and drive PCB
Pr6
4 No AC output while
selecting “AC”
Faulty power supply PCB Check, repair
or replace
Faulty inverter drive PCB Check, repair
or replace
Faulty IGBT module Check and
replace
5 The digital meter do
not display
properly
The LED is broken Change the
LED
6 The preset current
range does not meet
the machine
specification
Initial setting at PCB is not
accurate
Adjust
potentiometer
Imin on the
control PCB
for min current