IGBT short circuit fault troubleshooting

[GrehnanSondra]

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?

[Akhil_B · Accepted solution]

Hi @GrehnanSondra 

Thanks for posting on the Infineon community page.

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.

Best Regards,

Akhil Kumar.