Cause : ACX: Parameter back-up file corrupted - comes when then the Control Unit is booted, no complete data set was found from the parameter back-up files. The last time that the parameterization was saved, it was not completely carried out. It is possible that the backup was interrupted by switching off or withdrawing the memory card.

- Download the project again with the commissioning software.
- save all parameters (p0971 = 1 or "copy RAM to ROM").