F7459 fault in siemens sinamics V90 drive

F7459 fault in siemens sinamics V90 drive indicates a Zero mark was not detected. This means the axis passed the reference switch but failed to find the encoder's physical zero mark pulse within the expected distance. 

Cause:
After leaving the reference cam, the axis has traversed the maximum permissible distance (p2609) between the reference cam and the zero mark without finding the zero mark.

Remedy:
  • Check the encoder regarding zero mark.
  • Check the maximum permissible distance between the reference cam and zero mark (p2609).
  • Use an external encoder zero mark (equivalent zero mark).

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