KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc 16i 18i 21i SERIAL SPINDLE ALARM 749

Alarm 749 Description: Serial Communication error between the CNC and Spindle Amplifier

Check for the alarm status on the Spindle Amplifier Module and the communication cable.

Possible problems

• Cable between CNC and the Spindle Amplifier

• Parameter setting error

• Spindle Amplifier or Main CPU board

KFASLLC can help you determine the cause of Fanuc alarm 749