DS0022

DUAL CHECK SAFETY IS NOT WORKED

Fanuc · Alpha i Series Servo Amplifier

What does DS0022 mean?

The Dual Check Safety function is unavailable because parameter No.1902#6 is set to 0. This disables a critical safety feature of the system, potentially reducing safety integrity.

Common Causes

  • Dual Check Safety (DCS) function did not perform its verification task correctly.
  • Safety signal path interruption between redundant safety circuits.
  • Mismatched safety parameters in the DCS configuration.
  • Failure in the redundant encoder or speed feedback system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Set parameter No.1902#6 to 1 to enable the Dual Check Safety function.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier