SP0139
Pulse Error Alarm
Fanuc · αi Series AC Servo Motor and Spindle
What does SP0139 mean?
An error occurred in the interpolation circuit of the spindle control system. This typically indicates an issue with the feedback signal processing, leading to inaccurate position or speed control.
Repair Steps
- 1
Verify the integrity of the pulsecoder feedback cable (e.g., K22 for SV, K16/K97 for SP).
- 2
Check for electrical noise interference on the feedback lines.
- 3
Inspect the pulsecoder for physical damage or misalignment.
- 4
If the sensor head was moved, perform interpolation error learning according to Subsection 11.2.3.9.
Verified technical data. Last updated: March 2026
Source: Fanuc αi Series AC Servo Motor and Spindle