4
Over-current of Discharge Current (ECM)
Fanuc · αi Series AC Servo Motor and Spindle
What does 4 mean?
An over-current condition has occurred in the discharge current path from the Capacitor Modules of the ECM. This indicates a problem with the discharge circuit, potentially during emergency stop or an internal fault.
Repair Steps
- 1
Inspect the wiring and connections from the Capacitor Modules to the discharge circuit.
- 2
Verify the operation of the Resistor Module, which is used for discharging.
- 3
Check the Capacitor Modules for any signs of damage or internal shorts.
Verified technical data. Last updated: March 2026
Source: Fanuc αi Series AC Servo Motor and Spindle