Siemens servo spindle motor F31131 encoder alarm processing

Siemens servo spindle motor F31131 encoder alarm processing

Siemens S120 controller reports F31131 fault,? Is the core reason for abnormal recognition of motor commutation angle or unstable encoder signal? Usually related to motor initial position detection, encoder installation, or parameter configuration. This fault often occurs during the start-up or steady-state operation of the motor, and may be accompanied by rotor shaking or speed fluctuations.

Is the commutation angle parameter (P431) set improperly?

The deviation of the commutation angle can lead to incorrect magnetic field orientation, causing F31131. It is recommended to perform a complete static identification of the motor (P1990=1) to ensure its stability in the optimal range.

Encoder signal interference or connection issues?

If the absolute DUI value/incremental signal of Endat encoder is interfered or the wiring is loose, it will affect the magnetic pole position detection (r93). Check the shielding and grounding of the encoder cable to avoid parallel wiring with the power line, and confirm that there is no oxidation or virtual soldering at the joints.

Motor model parameters do not match?

If the static data of the motor (such as P1752) does not match the actual situation, it will cause the current loop control to be inaccurate. After replacing the motor, motor identification must be carried out again, and the use of old parameters is prohibited.

Poor control loop adjustment?

Excessive or insufficient PI parameters in the speed loop may trigger this fault. The proportional gain and integration time of the speed loop can be adjusted appropriately to reduce the sensitivity of the system to position errors.

External mechanical disturbance impact?

When the motor is stationary, rotor shaking will trigger F31131. It is necessary to check whether the mechanical load is loose, whether the coupling is eccentric, and eliminate external vibration sources.