Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters
The spindle motor speed has exceeded the programmed or safe operating limit. This can be caused by incorrect speed commands, parameter settings, or a malfunctioning speed sensor.
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Review the program for any excessively high S-codes or rapid speed changes.
Check parameter P1-02 (velocity gain) and P1-03 (velocity integration time).
Inspect the spindle encoder for damage and ensure stable mounting.
Reset the spindle amplifier to factory default speed control parameters.
Physically verify the spindle stops when commanded to stop.