Over-current at Power Running (ECM)
Fanuc · Macro B CNC Programming
What does 1 mean?
An over-current of the DC link current occurred during the power running phase of the motor operation as detected by the Energy Charge Module (ECM). This indicates that the motor is drawing excessive current, potentially due to an overload, short circuit, or amplifier malfunction, which the ECM attempted to assist.
Repair Steps
- 1
Immediately stop the machine using the emergency stop button and open the external Main Circuit Contactor (MCC) of the Power supply.
- 2
Check the motor and its connected load for any mechanical binding, excessive resistance, or foreign matter that could cause overcurrent.
- 3
Inspect the motor power cables (U, V, W) for any short circuits to ground or between phases.
- 4
Verify that the motor nominal current settings in the amplifier parameters accurately match the motor nameplate data.
- 5
If the alarm persists after verifying external conditions, consider potential internal failure of the servo amplifier or motor, requiring further diagnosis or replacement.