KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc ALARM SV0442 SP9033 aiPS-B AL-05

Alarm SV0442 and SP9033 on Fanuc 0iF or 31iB and AL-05 on aiPS-B means,
the PS pre-charge failure alarm is issued if the DC link capacitor is not normally pre-charged.

(2) Cause and troubleshooting
(a) No voltage is supplied to the power supply monitor (connector CX48) and main circuit of the
Power Supply.
→ Check the power supply monitor (connector CX48) and its cabling, magnetic contactor, or
breaker.
A phase of the power supply monitor (connector CX48) is disconnected.
→ Check the power supply monitor (connector CX48) and its cabling.
(b) A voltage outside of the specified range is input into the input power supply (three-phase AC).
→ An open-phase, unbalanced status, or low voltage is suspected. Check the power supply
voltage.
A phase of the power supply monitor (connector CX48) is disconnected.
→ Check the power supply monitor (connector CX48) and its cabling.
(c) A voltage beyond the specification is input into the input power supply (three-phase AC).
→ Check the power supply voltage.
(d) The magnetic contactor is OFF.
→ See "4.1.4 If the Magnetic Contactor Is Not Turned ON" in Part I.
(e) Pre-charge was not completed within the specified time because the delay time from emergency
stop cancellation to power-on of magnetic contactor was too long.
→ The ON sequence of the magnetic contactor is inappropriate. Check the PMC ladder.
(f) Pre-charge was not completed within the specified time because many spindle and servo
amplifiers were connected.
→ Review the number of connected amplifiers.
(g) The voltage value of the power supply monitor (connector CX48) in the Power Supply does not
match the input of the main circuit (L1, L2, L3).
→ Check the power supply monitor (connector CX48) and its cabling.
(h) The phase sequence of the power supply monitor (connector CX48) in the Power Supply does
not match the input of the main circuit (L1, L2, L3).
→ Check the power supply monitor (connector CX48) and its cabling.
(i) The DC link is short-circuited.
→ Remove the cause of the short circuit of the DC link.

(3) Cause identification using the SERVO GUIDE
The SERVO GUIDE allows you to identify the cause of this alarm by observing the internal data of
the Power Supply immediately after emergency stop is canceled.
For details on how to observe the internal data of the Power Supply using the SERVO GUIDE, see
Appendix C, "MEASURING INTERNAL DATA FOR THE POWER SUPPLY USING THE
SERVO GUIDE."

- Replace the Power Supply Module.

A06B6200 aiPS-B B65515EN Maintenance Manual

This alarm is applicable for the following units

A06B-6200-H003 αiPS 3-B
A06B-6200-H008 αiPS 7.5-B
A06B-6200-H011 αiPS 11-B
A06B-6200-H015 αiPS 15-B
A06B-6200-H026 αiPS 26-B
A06B-6200-H030 αiPS 30-B
A06B-6200-H037 αiPS 37-B
A06B-6200-H055 αiPS 55-B

A06B-6202-H003 αiPS 3-B
A06B-6202-H008 αiPS 7.5-B
A06B-6202-H011 αiPS 11-B
A06B-6202-H015 αiPS 15-B
A06B-6202-H026 αiPS 26-B
A06B-6202-H030 αiPS 30-B
A06B-6202-H037 αiPS 37-B
A06B-6202-H055 αiPS 55-B

*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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