Cause: Incorrect Configuration comes when a mismatch or inconsistency in the drive's parameter settings. An incorrectly installed, removed, or incompatible option card can trigger this fault.

"CFF" fault in Schneider ATV950 drive indicate "Incorrect Configuration". This means there is an issue with the drive's configuration. This could be due to incorrect parameter settings, a corrupted configuration file, or a mismatch between the drive's configuration and the connected hardware. 

Possible Cause:

1. Option module changed or removed.
2. Control block replaced by a control block configured on a drive with a different rating.
3. The current configuration is inconsistent.

Follow theses steps to correct the fault:

1. Verify that there is no detected error on the option module.
2. In the event of the control block being changed deliberately.
3. Return to factory settings or retrieve the backup configuration if it is valid.