C
Alarm of Power Supply (ECM)
Fanuc · A20B-2101-0390 αi series AC Servo Motor and Spindle
What does C mean?
A general alarm indicating an issue with the power supply providing power to the ECM system. This could be due to input voltage problems or an internal fault in the power supply unit.
Repair Steps
- 1
Check the input power supply to the ECM for stable voltage and frequency.
- 2
Inspect the connections from the power supply to the ECM.
- 3
Refer to the power supply unit's own diagnostics for specific fault indications.
Verified technical data. Last updated: March 2026
Source: Fanuc A20B-2101-0390 αi series AC Servo Motor and Spindle