2

Over-current at Regeneration (ECM)

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

What does 2 mean?

An over-current condition has occurred in the DC link during motor regeneration (deceleration). This indicates an issue with handling regenerative energy, potentially due to load or regenerative discharge unit problems.

Repair Steps

  1. 1

    Check the motor load during deceleration phases. Ensure it is within the amplifier's regenerative capacity.

  2. 2

    Verify the operation of the regenerative discharge unit and its connections.

  3. 3

    Inspect the servo amplifier for any regenerative over-current alarms.

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