Fault index
Power Device Failure Index
A power-electronics repair index for welders with IGBT, MOSFET, rectifier, driver, output-diode or repeated-failure symptoms.
Start here
Use this index when the machine trips the breaker, burns IGBTs/MOSFETs, has a shorted rectifier bridge, blows replacement devices, or loses output through secondary diode/load faults.
Root-cause principle
A blown IGBT or MOSFET may be a result, not the root cause. Driver supply, gate output, feedback, overcurrent protection, snubber/bus capacitor condition and output load should be checked before powering replacement parts.
Safe repair order
First isolate input/DC bus shorts, then test rectifier bridge and bus capacitors, then gate-driver and power devices, then output diode/secondary load, then staged power-up or precheck.
Start from these records
IGBT/MOSFET keeps blowingOpen related WelderData record.IGBT replacement precheckOpen related WelderData record.IGBT module testingOpen related WelderData record.Rectifier bridge testingOpen related WelderData record.ZX7-160/200 breaker trip / MOSFET shortOpen related WelderData record.ZX7 output diode shortOpen related WelderData record.LGK100L burns IGBTOpen related WelderData record.MIG200DL breaker tripOpen related WelderData record.