EL
ErrorLib
Brands
||
  1. Home
  2. Fanuc
  3. Alpha i Series Servo Amplifier
  4. SP9072
About·Privacy·Terms

ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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. 1

    Replace the SPM control printed-circuit board.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
Open Manual (Page 126)Search more codes in this manual