F
Resistor Module Abnormal Discharge (1) (ECM)
Fanuc · Alpha i 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.
Common Causes
- The braking resistor module is experiencing an abnormal discharge condition (first instance).
- Faulty braking resistor element or connection.
- Internal control signal error related to braking resistor activation.
- Over-temperature detected within the braking resistor module.
- Unexpected rapid discharge of energy through the resistor.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Inspect the Resistor Module and its connections for damage or open circuits.
- 2
Verify the control signals for initiating discharge.
- 3
Check the Capacitor Modules for any condition preventing discharge.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series AC Servo Motor and Spindle