Fanuc Alarm SV0449 AL-8. AL-9. AL-A. Alarm Information by KFASLLC

KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM SV0449 aiSV-B AL-8., AL-9., AL-A.

Alarm SV0449 Fanuc 0iF or 31iB and AL-8., AL-9., AL-A. on aiSV-B means,
an alarm has been output from the IPM (Intelligent Power Module) of the servo amplifier.
Cause and troubleshooting
(a) Be sure to push the control printed circuit board as far as it will go.

(b) Remove the motor power leads from the servo amplifier and cancel the emergency stop.

<1> If no IPM alarm condition has occurred
→ Go to (c).
<2> If an IPM alarm condition has occurred
→ Replace the servo amplifier.
(c) Remove the motor power leads from the servo amplifier and check the isolation between the U,
V, or W motor power lead and the PE.
<1> If the insulation is deteriorated
→ Go to (d).
<2> If the insulation is normal
→ Replace the servo amplifier.
(d) Disconnect the motor from its power leads, and check whether the insulation of the motor or
power leads is deteriorated.
<1> If the insulation of the motor is deteriorated
→ Replace the motor.
<2> If the insulation of any power lead is deteriorated
→ Replace the power lead.

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