7
Over-voltage of Capacitor Module (ECM)
Fanuc · A20B-2101-0390 αi series AC Servo Motor and Spindle
What does 7 mean?
The voltage across the Capacitor Module of the ECM has exceeded its maximum safe operating voltage. This indicates an issue with charge control or excessive regenerative energy.
Repair Steps
- 1
Inspect the Capacitor Modules for signs of bulging or damage.
- 2
Check the ECM control module's charging and discharge control circuits.
- 3
Verify the operation of the regenerative discharge unit if connected.
Verified technical data. Last updated: March 2026
Source: Fanuc A20B-2101-0390 αi series AC Servo Motor and Spindle