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. 1

    Inspect the Capacitor Modules for signs of bulging or damage.

  2. 2

    Check the ECM control module's charging and discharge control circuits.

  3. 3

    Verify the operation of the regenerative discharge unit if connected.

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Verified technical data. Last updated: March 2026
Source: Fanuc A20B-2101-0390 αi series AC Servo Motor and Spindle