F7802 fault in Siemens V70 Drive

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F7802 fault in Siemens V70 Drive indicates the Infeed or power unit is not ready. This means the internal power components failed to signal a ready state after startup, often due to a missing DC link voltage or hardware failure. Cause: After an internal power-on command, the infeed or drive does not signal ready because of one of the following reasons:
  • Monitoring time is too short.
  • DC link voltage is not present.
  • Associated infeed or drive of the signaling component is defective.

Remedy:
  • Ensure that there is a DC link voltage. Check the DC link busbar. Enable the infeed.
  • Replace the associated infeed or drive of the signaling component.

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