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
Some "pulse mismatch" errors can be cleared by navigating to the system menu and performing a pulse coder reset . fanuc 366 alarm
To determine if the fault lies in the motor, cable, or drive: The is a critical system alert indicating a
If the machine uses a linear scale or if the motor's pulse coder is exposed, check for grease or coolant buildup. Cleaning the scale or coder can often resolve "missed pulse" errors. 2. Diagnostic Swapping To determine if the fault lies in the
Loose or damaged feedback cables (encoder cables) and connectors.
Dirt, oil, or coolant ingress into the pulse coder or scale.