Question about Computers & Internet
Appreciate the direct "Ask Me".
Initially, pls charge the battery outside of the UPS. Thereafter try again. If the unit will perform, it is just that the UPS is not capable of charging the battery from a flat condition since it is normally designed to cutoff below a certain voltage level, say 10.8 volts. In some instances, it could that the comparator circuitry that is responsible for trigerring on/off the inverter when the battery is at a certain level is defective. Due to the absence of a schematic diagram my end, it would rather be difficult to pinpoint the exact part unlike what was available for the Samsung SyncMaster 753S. If you would try to wing it, pls start with fusible resistors, presence of standby voltage (often 24V), charging voltage of >12VDC and a +5 logic voltage/supply. Pls exercise extreme care, the battery terminals have a relatively higher voltage (than 12) with respect to the chassis ground.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Sep 21, 2008
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Posted on Jan 02, 2017
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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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