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We have a POWERWARE 9120 UPS system not working with error message :Powerware 9120 DC Bus Fault Problem.We have replaced all the batteries inside the UPS ,how do we do with this repairs ?.

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  • Hasnat Muneer
    Hasnat Muneer Sep 24, 2016

    My dear its not battry fault

  • Hasnat Muneer
    Hasnat Muneer Sep 24, 2016

    its related about pfc

  • SETLAK
    SETLAK Sep 24, 2016

    pfc means wha ?.. kindly sir explain

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Powerware 9120 DC Bus Fault Problem.

there is a 100uf/63v capacitor near the IRF630 fet. You need to replace this in order to fix this error. Along there is also a 2200uf/16v capacitor. It is a good idea to change the both at the same time.

Posted on Feb 05, 2008

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