Question about Powerware 9120 UPS System

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What cause dc bus fault on 9120 power ware ups?

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Why don't you check the DC bank capacitors, you may need to replace them

Posted on Jun 18, 2015

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Posted on Jan 02, 2017

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

  • 45 Answers

SOURCE: I have a power ware

I would contact Eaton's hardware support forum in Europe. Here is the documentation link for the 9120 UPS:

Posted on Jul 13, 2011

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Check to make sure your connections are correct and tight.

If you need UPS, Surge, or Power Related help contact Daniel @ Power & Systems Innovations 800.260.2259 or go to our website: http://psihq.com/

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Honestly, the cost of repair might exceed the cost of a new unit. We can likely get any parts needed to repair the unit, but might not be the most cost effective solution. Might want to price around for a replacement unit. If you need additional assitance, please contact us.

http://www.gowithon.com

Jun 27, 2009 | Powerware 9120 UPS System

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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.

May 20, 2009 | Powerware 9120 UPS System

1 Answer

Help - I have the same Fault!


Normally DC BUS FAULT is fixed by replacing C14 and C10. C14 is the 100uf/63V and C10 is 2200uf/16V. They are located between the heat dissipator and the logic board near transformer TX1.

Mar 12, 2008 | Powerware 9120 UPS System

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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.

Feb 13, 2007 | Powerware 9120 UPS System

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