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How to troubleshoot an SCF4 (IGBT Short Circuit Fault) on an Altivar Process Drive?

Published date: 18 June 2020

Troubleshooting a SCF4 on an Altivar Process Drive.

Product Line:
Altivar Process Drive (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

All serial numbers for Altivar Process Drive


The SCF4 code is an IGBT Short Circuit Fault

During the power up routine all IGBTs are checked for short circuit. Thereby a failure (short circuit or interruption) has been detected for at least one IGBT module. 

  • Perform a Diagnostic Test
    • [Diagnostics] [Diag. data] [Diagnostics]
      • ​[IGBT Diag w motor] IWT
      • [IGBT Diag w/o motor] IWOT
  • If test reads a short on an IGBT, then drive may need to be replaced
  • If test passes (no shorted IGBT),:
    • Check motor connections
    • Reduce switching frequence
    • Run drive with no motor connected and OPL turned off
      • To disable Output Phase Loss:
        • [Complete settings] [Error/Warning handling] [Output phase loss]
Sometimes fault can also occur when line power is connected onto the motor lead terminals. Make sure to connect line power to L1, L2 and L3

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