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ErrorLib — Industrial Fault Code Library

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SV0476

ILLEGAL SPEED CMD. (SV)

Fanuc · Alpha i Series Servo Amplifier

What does SV0476 mean?

The servo detected that the commanded speed on the axis exceeded the safety speed (parameter No. 13821 to 13824, No. 13826 to 13829) during safety monitoring (when the safety check request signal (*VLDVx) is 0). This suggests an unsafe operating speed was commanded or detected, posing a potential safety risk.

Common Causes

  • The system received an invalid or out-of-range speed command.
  • The requested speed value is not permissible by the drive's configuration.
  • Parameter P100.1 (Max Speed) is set too low for the command.
  • A command from a higher-level controller is invalid.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm that parameters No. 13821 to 13824 and No. 13826 to 13829 are set to appropriate safety speed values.

  2. 2

    Verify that the axis operation program ensures movement is performed within the defined safety speed limits.

  3. 3

    Check the status of the safety check request signal (*VLDVx) to ensure correct operation of safety monitoring.

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

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
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