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ErrorLib — Industrial Fault Code Library

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h

Fuse Blowing (Capacitor Module) (ECM)

Fanuc · Alpha i Series AC Servo Motor and Spindle

What does h mean?

The fuse within the Capacitor Module has blown. This indicates an over-current condition or a short circuit within the Capacitor Module. The LED (D2) in the front of a Capacitor Module that the fuse was blown turn off the light.

Common Causes

  • Current exceeds limits during the motor running phase.
  • Overload condition on the motor.
  • Incorrect motor parameter configuration (e.g., P1-22).
  • Stalling or jamming of the driven equipment.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the control voltage (24V) is ON while checking the LED (D2) on the Capacitor Module to confirm the fuse status.

  2. 2

    If the fuse is blown, inspect the Capacitor Module for short circuits or damaged components before replacing the fuse.

  3. 3

    Replace the blown fuse with one of the correct rating.

Browse all codes in this manual (29)
Verified technical data. Last updated: April 2026

Related Faults

08Regeneration Excess Alarm1Over-current at Power Running (ECM)2Over-current at Regeneration (ECM)
Source: Fanuc Alpha i Series AC Servo Motor and Spindle
Open Manual (Page 588)Search more codes in this manual