3

Over-current of Charge Current (ECM)

Fanuc · A20B-2101-0390 αi series AC Servo Motor and Spindle

What does 3 mean?

An over-current condition has occurred in the charge current path to the Capacitor Modules of the ECM. This suggests an issue with the charging circuit or a fault in the capacitor modules themselves.

Repair Steps

  1. 1

    Inspect the wiring and connections to the Capacitor Modules.

  2. 2

    Verify the operation of the ECM's control module, especially its charging circuit.

  3. 3

    Check the Capacitor Modules for any signs of damage or overheating.

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