System Alarm: Feedback Mismatch, Semi-Closed Loop Error, or Current Offset Error
Fanuc · αi Series Servo Amplifier
What does Alarm 5 mean?
This alarm can indicate multiple issues depending on the set bits. If the OFS bit is set, it is a Feedback Mismatch alarm, suggesting opposite move directions for the position and velocity detectors. Other bits include MCC for Excessive Semi-Closed Loop Error and LDM for Current Offset Error.
Repair Steps
- 1
If the OFS bit is set (Feedback mismatch alarm), check the rotation direction of the separate detector.
- 2
If the separate detector's direction is opposite to the motor's rotation: For a Phase A/B detector, reverse the A and __A connections.
- 3
If the separate detector's direction is opposite to the motor's rotation: For a Serial detector, reverse the signal direction setting for the separate detector.
- 4
For Series 90B0/07 and subsequent editions, verify the setting that allows the signal direction to be reversed even for the phase A/B detector.