A7576 alarm in siemens sinamics V90 drive indicates Encoderless operation is active due to a fault. This means the drive detected a problem with the encoder and has automatically fallen back to an open-loop control mode.
Cause: Encoderless operation is active due to a fault.
Remedy:
- Remove the cause of a possible encoder fault.
- Carry out a POWER ON (power off/on) for all components.
