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. 1

    Check for excessive system load on the CNC control.

  2. 2

    Measure communication line resistance and capacitance.

  3. 3

    Verify APC encoder's internal clock and communication speed.

  4. 4

    Adjust CNC communication timing parameters if applicable.

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

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Source: Fanuc Alpha i Series Servo Amplifier