Delixi LGK-ID IGBT User Manual page 16

Output current is unstable or
not controlled
potentiometer during
cutting.
VIII. Troubleshooting
striking power plug (close to fan VH-03 inserter) and restart.
a. Indicator lamp for fault is on due to some field effect transistors on MOS
plate are damaged. Check and replace the same type field effect transistor.
b. Indicator lamp for fault is off due to step up transformer of high frequency arc
striking circuit is damaged and need to be replaced.
2) Indicator lamp for fault is off.
a. Medium transformer is damaged. Measure the primary inductance and Q
value of transformer by electric bridge.
b. Some transformer secondary rectifying tubes are penetrated. Check and
replace by same type.
4. Feedback circuit is opened.
1. Check poor contact for each connection especially for connector etc.
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