F

Resistor Module Abnormal Discharge (1) (ECM)

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

What does F mean?

The Capacitor Modules are not discharging as expected, indicating a potential malfunction of the discharge circuit or the Resistor Module itself.

Repair Steps

  1. 1

    Inspect the Resistor Module and its connections for damage or open circuits.

  2. 2

    Verify the control signals for initiating discharge.

  3. 3

    Check the Capacitor Modules for any condition preventing discharge.

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