I have a yaskawa vfd which has proper incoming voltage but faults out for IGBT short circuit as soon as it’s started. We tried a another old vfd which had been sitting in the storeroom for long time but that gives the same fault?
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Before changing the IGBT please check the below parameters
- Blocking voltage (Vce)
- Collector Current
- Gate charge
- Gate resistors
- Gate to Emitter voltages
- Gate Peak current
- Saturation voltage
- Switching Energy (Eon & Eoff)
- Thermal resistance
- Temperature rise
If the above-mentioned parameters are under limits, ensure that gate pulses are proper.
Share the schematic of VFD, Infineon IGBT, and driver part numbers to verify.