Question about Powerware 9120 UPS System

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Powerware 9120 DC Bus Fault Problem.

I have a Powerware 9120 that shows 'DC BUS FAULT' error on screen. What causes this error? How can this be repaired? Unit is out of warranty,

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  • Anonymous Nov 07, 2007

    I got the same problem "DC Bus Fault"

  • katy martinez Feb 07, 2008

    Powerware 9120 DC Bus Fault

  • asenk2006 Jun 23, 2008

    I have a Powerware 9120 that shows 'DC BUS FAULT' error on screen.

    What causes this error? How can this be repaired?thanks

  • Agosu Segun Aug 05, 2008

    WHAT CAN CAUSE THE FAULT AND WHAT CAN BE DONE TO REPAIR IT WHEN IT DISPLAYS DC BUS FAULT

  • kapekele Sep 08, 2008

    It is just te same problem, display of DC Bus Fualt on the LCD and the protected units went off.

    Email me, please.

  • fxtommy May 14, 2009

    bypass not avail

  • ghdshgsd May 11, 2010

    thanks!! fixed my problem too.......



    change the 2200uF and the 100uF

  • damonms May 11, 2010

    I had one with the same issue, I replaced the 2 caps and it worked great for a while and now it is down again with the same error message. Now I have a couple of them with the error. Is there fix beyond the 2 caps ?

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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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  • martinc996 Sep 04, 2013

    Hi Vassilis,

  • Iannis Manousakas Sep 13, 2013

    Hi Vassili I can't locate the capasitors Can u post a photo of the circuit board of 9120 6kva

  • Vassilis Chamaidis Sep 20, 2013

    Iannis. This fix is for the 700va model. For now i have no solution regarding the 6kva model.

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Hey bham_athens you are the man... The solution you provided is right in the spot. Atleast for me it worked flawlessly. Thank you very much !!!

Posted on Mar 01, 2008

  • Mohammad Ayaz Jun 11, 2011

    What solution Mr.bham_athens had suggested for rectification of the problem?

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On the big heat sink there is an insulated gate bipolar transistor G4PF50W near the rectifier , remove it and measure it using a digital multimeter. If it is open i.e it cannot read anything then replace it. Also make sure that the rectifier is ok.

Posted on May 27, 2009

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Pleace change the three 100uf/50v as indicated in the image attached and the 47uf/400v by the side of K2608 wise you all the best.The name is Ansah of IPMC.

Posted on Feb 13, 2015

  • Adrin Freisinger
    Adrin Freisinger Apr 19, 2016

    Hi Ansah, where is the attached image, please ? Thanks

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Dc bus fault error occurs when booster section is not working, try to replace booster section igbt & associated gate drive circuit of psdr card

Posted on Oct 16, 2011

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DC Bus Fault error can't be repaired by replacing the batteries. It is a board problem. Most of the transistors on the board are toasted. I tried to repair this with no avail. I need a diagram of its board to repair it.

Posted on Jan 17, 2008

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Try to change the battery inside with a new one. good luck!

Posted on Feb 13, 2007

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I think you have to change the PSDR board inside the UPS.

sayan

Posted on Mar 13, 2009

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My UPS- Lever EM15 15kVA- shows " VDC BUS MEASURES ERROR" on screen. What causes this error? How can this be repaired?

Powerware 9120 DC Bus Fault Problem. - c6da7720-8d4b-4631-862e-3fa465b989dd.jpg

Posted on Jan 21, 2017

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Allways something to remember if replace parts i will give a little hint to this emergency devices if there is a capacitor rolling neccesary to give it an extra long time to live is in this kind of error to think first to measure the flow again which is on the capacitors and how much tolerance is left with respect to the value usually tight chosen by the manufacturer financially gain so that it breaks down faster (from Korea manufactured capacitors effect I call it), if for example, you will find a 10 volt capacitor and there is 9 volts, put your nowadays usually easy good nichicon, rubycon or elna 16 v or even 25 volt type in place so that you have a power reserve and that the life also significantly improves the capacitor cups are now small course, to see if it fits in place for a minimum always 6 volts higher than the selected type capacitor.

Posted on Sep 28, 2016

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It is both condenser 3300 mf 450 V that it is necessary to change

Posted on Jun 14, 2009

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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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DC Bus Fault in Powerware 9120 6KVA


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

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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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