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

The SCF4 code indicates the Altivar drive detected an IGBT Short Circuit Error

Cause:
During the power up routine all IGBTs are checked for short circuit. This error indicates a bad test result (short circuit or interruption) has been detected for at least one IGBT module.

Remedies:

• Check the motor and cable for possible short, phase to phase or phase to ground.
• If the drive will reset after a power cycle, perform the Diagnostic Test
  • [Diagnostics] [Diag. data] [Diagnostics]
    • ​[IGBT Diag w motor] if motor is connected to the drive
    • [IGBT Diag w/o motor] if motor is not connected to the drive
• ​If test reads a short on an IGBT, with the motor connected, then disconnect it and re-test. If the drive still has an issue with out the motor connected, the drive may need to be replaced
• Follow the steps in this FAQ to test the IGBT's: https://www.se.com/us/en/faqs/FA314404/
• If test passes (no shorted IGBT),:
  • Check motor connections
  • Reduce switching frequency
  • Run drive with no motor connected and OPL turned off
    • To disable Output Phase Loss:
      • [Complete settings] [Error/Warning handling] [Output phase loss]
  • ​​​​​​​Check Ctt: Motor Control Type in [Complete settings] [Motor Parameters] and change to U/F VC Standard
  • Be sure to change settings back after testing is complete

Sometimes the error 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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