H

Resistor Module Abnormal Discharge (2) (ECM)

Fanuc · Alpha i Series AC Servo Motor and Spindle

What does H mean?

The Capacitor Modules are not discharging due to a malfunction of the discharge circuit. This points to a failure within the Resistor Module's components or control.

Common Causes

  • The braking resistor module is experiencing an abnormal discharge condition (second instance).
  • Persistent fault in the braking resistor system.
  • Contradictory signals from the braking resistor monitoring system.
  • Component failure within the braking resistor control or sensing circuitry.
  • Improper heat dissipation from the resistor, leading to thermal issues.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the Resistor Module for internal component failure or signs of overheating.

  2. 2

    Verify the functionality of the discharge circuit's control logic.

  3. 3

    Check resistance values of the Resistor Module components, if accessible.

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

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Source: Fanuc Alpha i Series AC Servo Motor and Spindle