KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM SV0439 SP9011 aiPS-B AL-07

(1) Alarm SV0439 and SP9011 on Fanuc 0iF or 31iB and AL-07 on aiPS-B means,
the DC voltage is abnormally high.
(2) Cause and troubleshooting
(a) Excessive regenerative power
The capacity of the Power Supply is insufficient.
→ Check the specifications of the Power Supply and review the operation of the motor.
(b) The impedance of the power supply is high.
→ Check the impedance of the power supply. (Normal if the voltage variation at maximum
output time is within 7%)
(c) The main circuit was disconnected with emergency stop canceled
→ Check the sequence or magnetic contactor.
→ Replace the Power Supply Module.

A06B6200 aiPS-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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