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IGBT Forum Discussions

GrehnanSondra
Level 1
First question asked Welcome!
Level 1

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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BandaruAkhil
Moderator
Moderator 50 sign-ins 25 replies posted 10 solutions authored
Moderator

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.

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