SP9072
MISMATCH RESULT OF MOTOR SPEED CHECK
Fanuc · Alpha i Series Servo Amplifier
What does SP9072 mean?
The spindle detected a mismatch between the CNC result of the motor speed check and the spindle's own result. This indicates a discrepancy in speed monitoring data between the CNC and the spindle control, suggesting a potential fault in the SPM control printed-circuit board.
Common Causes
- The calculated motor speed does not match the monitored actual speed.
- Faulty tachometer or encoder providing incorrect speed feedback.
- Discrepancy in speed calculation algorithms between two monitoring points.
- High vibration or mechanical resonance affecting speed measurement.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Replace the SPM control printed-circuit board.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series Servo Amplifier