Question about APC Smart-UPS UPS System
About once a week these 3 year old UPSs (with NEW batteries) cause a computer glitch, apparently during a "self test cycle." Attempts to dukplicate the problem go nowhere. Substituting with a new (cheap) UPS eliminated the problem for over 8 weeks now and counting. I have noticed this condition before with this model and it's prededecessorss.
I suspect one of the (5) Song Chuan (chineese mfg.) relays on the control board has pitted and or bouncing contacts. Replacing all 5 relays on a guess seems like a wast of time and money. Any specific advice? Have you seen or heard of this behavior before?
The lack of a schematic makes this a questionable endeavor, and sending it out for repair of an intermittent condition is almost a guarnteed frustration.
Are you sure it's not every 2 weeks? I had this problem with machines shutting down that were running on smart ups 750's. By default, these ups' run a self test every 2 weeks. Using the sofware provided with the ups (or you can download from apc) you can change the self test to 'never'. Note that this problem only happened on machines that were running on too low input voltage.
Posted on Aug 12, 2009
I would certainly NOT send these out for repair, if this were me, since I agree that you will find yourself not only spending a lot, but may find no resolution for this problem without replacing the boards.. with the cost of UPS's dropping, and the importance of having a reliable Power Supply increasing, I would just replace the entire UPS with a proven, good Power Supply Backup...
JMHO, of course..
Posted on Dec 08, 2007
Tips for a great answer:
Automatic: The UPS performs a self-test automatically when turned on, and every
two weeks thereafter (by default). During the self-test, the UPS briefly operates the
connected equipment on battery.
Manual: Press and hold the button for a few seconds to initiate the self-test
REPLACE BATTERY LED ILLUMINATES
Replace Battery LED flashes and
short beep is emitted every two
seconds to indicate the battery is
Check that the battery connectors are fully engaged.
Weak battery. Allow the battery to recharge for 24 hours. Then, perform a self-test. If the
problem persists after recharging, replace the battery.
Failure of a battery self-test. The UPS emits short beeps for one minute and the Replace Battery LED
illuminates. The UPS repeats the alarm every five hours. Perform the self-test
procedure after the battery has charged for 24 hours to confirm the Replace
Battery condition. The alarm stops and the LED clears if the battery passes the
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I have the same problem with an apc smart-ups VS 650.
New batteries - charge in batteries is good (also tested under load).
When AC power fails, no power is supplied to PC connectors by the UPS.
UPS self test works fine. UPS does not report any problems via software - Power Management under Windows XP.
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