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: Move the drive to another axis. If the fault follows the drive, the amplifier is the issue. If it stays with the original axis, the problem is likely the cable or motor/encoder. Check Parameters
If the to the other axis, then the motor’s encoder is faulty. If the alarm stays with the same axis (and the motor is known good), then the problem is in the cable, drive, or control.
Grounding issues or noise in the feedback circuit. Step-by-Step Troubleshooting Guide fanuc 366 alarm
If these steps don't resolve the issue, contact a certified Fanuc service integrator with specialized diagnostic tools.
: The pulse coder itself may be failing, or the internal circuitry of the servo amplifier that interprets the pulses could be faulty. Steps to Resolve
Alarm 366 – Parentheses are for comments. Use [ #103 * #104 ] . This public link is valid for 7 days
A damaged feedback cable is often responsible for current abnormalities.
Several factors can interrupt the encoder signal. Understanding these causes helps narrow down the troubleshooting process. 1. Faulty or Damaged Feedback Cable
If the alarm persists, you need to determine whether the fault lies in the motor/encoder or the drive. If your machine has two identical axes (e.g., identical X and Y drives and motors), you can perform a swap test. Turn off all power before swapping cables. Can’t copy the link right now
If you encounter this alarm, follow these diagnostic steps to isolate the fault: Common FANUC CNC Alarms List
The encoder’s internal LED or receiving photo-transistors have failed. Step-by-Step Troubleshooting Process
Examine the physical connection points at both the servo motor housing and the feedback ports on the top of the servo amplifier module.