Fanuc Alarm SV0012 AL-4 Alarm Information by KFASLLC

KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM SV0012 aiSV-B AL-4

Alarm SV0012 Fanuc 0iF or 31iB and AL-4 on aiSV-B means,
settings for the safe torque-off function are incorrect or the circuit is abnormal.
Cause and troubleshooting
(a) Check the parameter settings.
(b) Check if the STO-A and STO-B cables are disconnected.
(c) Check if the input time is off by more than 10 s between the STO-A and the STO-B.
(d) Replace the servo amplifier.
(e) Replace the safety PLC or other component.
(3) Details of LED indicators
(a) If the first axis of the servo amplifier is abnormal, 4 is displayed and the top horizontal bar
blinks.
(b) If the second axis of the servo amplifier is abnormal, 4 is displayed and the bottom horizontal
bar blinks.
(c) If the third axis of the servo amplifier is abnormal, 4 is displayed and the bottom left vertical
bar blinks.

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

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