F30003 fault in Siemens V70 Drive

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F30003 fault in Siemens V70 Drive indicates a DC link undervoltage. This means the internal DC bus voltage dropped too low, caused by a failure or dip in the incoming AC line supply. Cause: The power unit has detected an undervoltage condition in the DC link.
  • Line supply failure.
  • Line supply voltage below the permissible value.
  • Line supply infeed failed or interrupted.
  • Line phase interrupted.

Remedy:
  • Check the line supply voltage.
  • Check the line supply infeed and observe the fault messages relating to it (if there are any).
  • Check the line supply phases.
  • Check the line supply voltage setting.

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