KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM SV0600 aiSV-B AL-8

Alarm SV0600 Fanuc 0iF or 31iB and AL-8 on aiSV-B means,
the DC link current in the servo amplifier is abnormal.
Cause and troubleshooting
(a) Remove the motor power leads from the servo amplifier and cancel the emergency stop.
<1> If no abnormal DC link current alarm condition has occurred
→ Go to (b).
<2> If an abnormal DC link current alarm condition has occurred in the amplifier.
→ Replace the servo amplifier..
(b) 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 (c).
<2> If the insulation is normal
→ Replace the servo amplifier.
(c) 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

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