E

Abnormal Charge of Capacitor Module (ECM)

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

What does E mean?

The Capacitor Modules are not charging as expected. This indicates a problem with the charging process or a fault within the capacitor modules preventing them from holding charge.

Repair Steps

  1. 1

    Check the power supply connections to the Capacitor Modules.

  2. 2

    Verify the functionality of the charging circuit within the ECM control module.

  3. 3

    Inspect the Capacitor Modules for physical damage or internal failure.

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