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Thread: UPS and aPFC PSU compatibility?

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    Angry UPS and aPFC PSU compatibility?

    I own a APC 800va UPS . It has a stepped sinewave output . I use it with seasonic X-750W psu (it's Active Power Factor Correction). When there is a electric blackout. UPS reacts quickly, and pc doesnt shutdown. But there is an annoying buzzing sound coming from the PSU .

    Some claim it's even worse than a shutdown ,and aPFC PSU's should only be used with pure sinewave UPS's.

    Others claim that , buzzing sound doesn't matter at all , Active Power Factor Correction PSU work fine with stepped sinewave UPS's . Should i be using this UPS ?

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    I think that this discussion here will cover you
    http://www.jonnyguru.com/forums/show...light=sinewave
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
    Mobo:Asrock 939a785g
    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
    Monitor:Asus VE228HR
    Tower:Coolermaster Elite 430

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    Quote Originally Posted by sith'ari View Post
    I think that this discussion here will cover you
    http://www.jonnyguru.com/forums/show...light=sinewave
    Thank you for the link.

    it didnt help much. Basicly it's like any other discussion, noone is sure .

    I guess it all depends on the psu and the ups , that why noone has an definite answer.

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    sith'ari (11-17-2015)

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    Yep, depends on the actual configuration. Often the PSUs work till some power level when the PFC section shuts down. Now it also depends on the PSU architecture as well, some turn off at that moment (especially at 120 V), some continue to run without PFC (at 230 V) but than you put more stress on the PSU.

    Also remember that UPS is not even powerfull enough for 750 W. I expect that to be the old RS800?

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    sith'ari (11-17-2015)

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    Yes, RS800.

    I had blackouts, never had a problem so far, UPS kicks in , and computer works just fine (but there is that buzzing sound from the psu).

    PSU is 750W, but even when playing taxing 3d games, power draw is about 350W(incl monitor) , so the ups is enough.

    So shall i keep using this UPS?

    I dont understand . if these stepped sinus ups 's arent fully compatible, why are they selling these in the first place. All PSU's are aPFC anyway. It's not like we have a choice not to buy one without.

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    sith'ari (11-18-2015)

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    There are some old or el-cheapo PSUs with passive PFC. This RS series is obsolete as well, never ones often claim better compatibility.

    In any case, I suggest replacing bad capacitors in that UPS before it is too late and ithe symptoms start appearing. This uni is chronical patient, if you have it for more than three years I am certain at least couple of them will be bad already. Those are tiny SMD caps, it is possible to replace them with ordinary leaded caps. But you need 2 solder irons to desolder these capacitors.

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