Question about APC Smart-UPS 1000VA UPS System

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UPS not seeing AC.

I work for an organisation which relies heavily on UPS to maintain important communications circuits in the event of power outages.

Recently we have begin to witness a common fault pattern across a number of our APC UPS. Without there having been any noticeable mains issues, a single UPS (among the many we have deployed) will inexplicably fail to see mains. When we power down and bring the unit back online, the AC indicator flashes and then the unit proceeds to power from battery.
After the last occurance, we moved a known good unit to replace one which had begin to display these symptoms, only to have it do the same thing once it had been reconnected to our mains source.

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I would suspect "dirty" power to be the cause. You might want to measure & monitor what the voltage levels are that you're getting from that particular mains source. Either it is already below the set threshhold to switch to battery, or it dips below it, and never comes up enough to reach the threshhold to return back to AC power.

Posted on Jun 30, 2008

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