Fanuc 366 Alarm • Working

If the above steps fail, the spindle amplifier itself may be faulty. Swap with a known working unit (ensure same model).

When the 366 alarm appears, the machine is typically in Emergency Stop (E-Stop) mode with servos disabled. fanuc 366 alarm

The FANUC 366 alarm (often displayed as "AL-366" or "SV-366") is a Servo Alarm related to the serial encoder communication between the CNC control and a servo amplifier/motor. It typically indicates a soft-phase (serial pulse) error or a communication data error on the servo bus. If the above steps fail, the spindle amplifier