F7431 fault in siemens sinamics V90 drive

F7431 fault in siemens sinamics V90 drive indicates Changeover to encoderless operation is not possible. This means the drive is currently executing closed-loop torque control and cannot dynamically switch to an encoderless state. 

Cause:
For closed-loop torque control, the converter cannot change over to encoderless operation.

Remedy:
  • Do not attempt to change over to encoderless operation.
  • Check the encoder cable connection.

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