SV0302
APC ALARM: OVER TIME ERROR
Fanuc · Alpha i Series Servo Amplifier
What does SV0302 mean?
The absolute-position detector caused an overtime error during data transfer, meaning the correct machine position could not be obtained. This fault suggests a defect in the absolute-position detector, its cable, or the servo interface module.
Common Causes
- Slow response from the APC encoder during position updates.
- Communication link is experiencing high latency or delays.
- Overload on the APC processing unit.
- Incorrect timing parameters set in CNC.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check for excessive system load on the CNC control.
- 2
Measure communication line resistance and capacitance.
- 3
Verify APC encoder's internal clock and communication speed.
- 4
Adjust CNC communication timing parameters if applicable.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series Servo Amplifier