For certain over-travel or reference position issues related to encoders, you can hold the "P" and "CAN" keys during power-up. This forces the system to ignore some alarms until the first zero reference is established. Professional Repair and Replacement
Dirt, oil, or coolant ingress into the pulse coder or scale. fanuc 366 alarm
If your CNC control displays a 366 alarm, follow these steps to isolate and fix the issue: For certain over-travel or reference position issues related
A physical defect within the built-in pulse coder itself. If your CNC control displays a 366 alarm,
External electromagnetic interference disrupting the high-precision pulse signal. Troubleshooting and Resolution Steps
The is a critical system alert indicating a Pulse Miss in the built-in pulse coder of a servo motor. This error typically signifies that the CNC control has detected an inconsistency or "missed pulse" in the feedback signal, preventing the system from accurately tracking the axis position. Core Causes of the 366 Alarm
Inspect the feedback cable between the servo motor and the amplifier for fraying, sharp bends, or loose plugs. Reseat the connectors to ensure a solid connection.