SRVO-089
Line Tracking Motor Overheat
Fanuc · R-30iB Mate + Mate Plus Robot
What does SRVO-089 mean?
The motor connected to the line tracking encoder has overheated. This alarm persists even after the Pulsecoder has cooled sufficiently and power is reapplied, indicating a persistent overheating condition or sensor issue.
Common Causes
- Overheating of the motor driving the line tracking encoder.
- Excessive load on the line tracking axis exceeding motor thermal limits.
- Malfunction of the motor's internal thermal protection sensor.
- Inadequate cooling to the line tracking motor housing.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Measure motor winding resistance. Compare values to P1-54 specifications.
- 2
Check motor encoder signal integrity at terminal E1-E4.
- 3
Verify cooling fan operation for the line tracking motor assembly.
- 4
Inspect motor mounting for proper heat dissipation.
- 5
Monitor motor temperature via parameter P1-78 during operation.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc R-30iB Mate + Mate Plus Robot