Question about APC Back-UPS XS900 (BX900) UPS System
Unit has new batteries and new fan. When NOT plugged in to AC unit will come on and work as expected.( Delivering power to output ). Plug in AC cord, unit beeps and both online and on battery lights come on and blink. No power is being output. Also hear clicking sound that happens when both lights blink. Unplug AC cord, turn unit off then back on batteries will produce power to outlets. So then the unit works when not plugged into AC but works off batteries when unplugged.
Check UPS relays one of the relay might be welded thats the reason why once you plug in on the Mains your UPS start blinking and shutdown the load. Hope this helps
Posted on Jul 09, 2014
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Posted on Jan 02, 2017
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