Fanuc Alarm blinking AL-A Alarm Information by KFASLLC

KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM Blinking AL-A aiSV-B

Alarm Fanuc 0iF or 31iB and blinking AL-A on aiSV-B means,
A power lead is disconnected or the motor is defective.
Cause and troubleshooting
(a) Check that the power leads are connected.
(b) Check whether a power lead is disconnected. If there is a disconnected power lead, replace it.
(c) Check whether a motor winding is disconnected. If there is a disconnected motor winding,
replace the motor.

A06B6240 aiSV-B B65515EN Maintenance Manual

*CAUTION: High Voltage present.
Note: Some Machine's electrical cabinet doors are equipped with "door interlock" that will cause the breaker to trip when the door is open.
See the machine's manual for information on how to bypass so that you can observe the alarm LED status

Fanuc CNC Alarm App for your smart phone