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
Check whether the separate detector outputs position feedback pulses correctly.
- 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.
Verified technical data. Last updated: March 2026
Source: Fanuc αi Series Servo Amplifier