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
Verify the control voltage (24V) is ON while checking the LED (D2) on the Capacitor Module to confirm the fuse status.
- 2
If the fuse is blown, inspect the Capacitor Module for short circuits or damaged components before replacing the fuse.
- 3
Replace the blown fuse with one of the correct rating.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series AC Servo Motor and Spindle