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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.

500

Positive Overtravel Limit Exceeded

Fanuc · Alpha i series AC Servo Motor

What does 500 mean?

The machine has exceeded its positive stroke limit. This indicates a physical limit switch activation or an incorrect move command, which can cause mechanical interference or damage.

Common Causes

  • Positive stroke limit switch (*+OT) is incorrectly connected or activated
  • Incorrect move command specified, leading to overtravel

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check whether *+OT is connected correctly

  2. 2

    Check whether a correct move command is specified

  3. 3

    Move the tool in the opposite direction in jog mode, then perform a reset

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

000Power-Down Required Parameter011Zero Feedrate Specified013Maximum Feedrate Zero
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 230)Search more codes in this manual