Alarm 2

Software Disconnection (Closed Loop)

Fanuc · αi Series Servo Amplifier

What does Alarm 2 mean?

This alarm is issued when the change in position feedback pulses is relatively small for the change in velocity feedback pulses. This condition typically occurs in a closed-loop system and is not issued with the semi-closed loop.

Repair Steps

  1. 1

    Check whether the separate detector outputs position feedback pulses correctly.

  2. 2

    If the detector outputs pulses correctly, investigate for a large backlash between the motor position and scale position causing reverse rotation of only the motor at the start of machine operation.

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