F7412 fault in siemens sinamics V90 drive indicates an incorrect Commutation angle. This means the drive cannot correctly determine the rotor’s magnetic position, often caused by a misaligned or damaged motor encoder.
Cause:
An incorrect commutation angle was detected that can result in a positive coupling in the speed controller.
Possible causes:
- The motor encoder is incorrectly adjusted with respect to the magnet position.
- The motor encoder is damaged.
- Data to calculate the motor model has been incorrectly set.
- Pole position identification might have calculated an incorrect value when activated.
- The motor encoder speed signal is faulted.
- The control loop is instable due to incorrect parameterization.
Remedy:
- If the encoder mounting was changed, re-adjust the encoder.
- Replace the defective motor encoder.
- Correctly set the motor stator resistance, cable resistance and motor-stator leakage inductance. Calculate the cable resistance from the cross-section and length, check the inductance and stator resistance using the motor data sheet, measure the stator resistance, e.g. using a multimeter – and if required, again identify the values using the stationary motor data identification.
- With pole position identification activated, check the procedure for pole position identification and force a new pole position identification procedure by means of de-selection followed by selection.
