Question about Powerware 9120 UPS System

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Dc bus fault

LCD message display is dc bus fault. why comes this fault? what is remade?

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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

bob_computer
  • 3153 Answers

SOURCE: Troubleshooting of "DC BUS Fault"

its busted by the sounds of it so unless you add more detail thats all I will give as an answer

Posted on Dec 06, 2011

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its busted by the sounds of it so unless you add more detail thats all I will give as an answer

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My ups has is faulty i need a circuit diagram to fix it


I had a DC bus fault error displayed.

So I unplugged battery, then turned on UPS. It said Batt disconnected of course.

So when I plugged in the batt while the UPS was on, and held the power button for a few sec, the UPS displayed Batt testing.

After a few moments it was back online and had no faults!

Worth a shot.

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