Alarm 6

Software Disconnection (α Pulse Coder)

Fanuc · αi Series Servo Amplifier

What does Alarm 6 mean?

This alarm is issued when the absolute position data sent from the built-in α pulse coder cannot be synchronized with the phase data.

Repair Steps

  1. 1

    Turn off the NC (Numerical Control) power.

  2. 2

    Remove the pulse coder cable.

  3. 3

    Attach the pulse coder cable again securely.

  4. 4

    If this alarm is issued again after re-attaching the cable, replace the pulse coder.

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Verified technical data. Last updated: March 2026
Source: Fanuc αi Series Servo Amplifier