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ErrorLib — Industrial Fault Code Library

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411

Servo Position Error (During Movement)

Fanuc · Alpha i series AC Servo Motor

What does 411 mean?

The servo position error during movement is larger than the value specified in parameter No.182. This suggests that the motor is not accurately following its commanded trajectory during motion, indicating potential mechanical issues or inadequate control tuning.

Common Causes

  • Mechanical cause of large position error during movement (e.g., excessive friction, load inertia mismatch, worn components).
  • Parameter No.182 (position error limit during movement) is set too low for the application.
  • Feed rate is too high for the system's capabilities.
  • Insufficient time constants for proper control response.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the mechanical system for any sources of position error during movement (e.g., excessive friction, worn bearings, uncompensated load).

  2. 2

    If no mechanical cause is found, specify a larger value for parameter No.182.

  3. 3

    Specify a lower feed rate for the axial movement.

  4. 4

    Increase the time constants (e.g., position loop gain, velocity loop gain parameters) to improve tracking performance.

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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
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