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Do you have any load connected to the UPS?
And what load?
Do the cap have look swollen or can you see any leakage?

Posted on Jan 23, 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

  • 1 Answer



I have edp70 30kva 3:3 out problom is that ups is just given me the 20 to 30 sec backup. and output 2 phase 220v last phase is given just 15v ac. plz send me the tecnicaly solution.And plz reply as soon as my email,

Posted on Jun 15, 2010

  • 39 Answers

SOURCE: hi we have problem with 6kva 9120 eaton ups,

The Poweware UPS is a true on-line UPS System, so it will handle sustained over and under voltages to +20% and -15%. If you are getting input spikes, the UPS has MOV's which will handle input spikes, and if too great a spike, the MOV will die attempting to save the UPS output load. If you are having further UPS input problems you need to put a good quality surge arrestor at the panel feeding the UPS on BOTH circuit legs feeding the UPS.

Posted on Feb 08, 2011

  • 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

  • 38 Answers

SOURCE: If Eaton APS6-059 UPS is connected to 48v DC(Car batteries in series eg.) can the 220v AC outlets power electrical appliances of suitable rating ?

What is the rating on the output of the UPS? kVA? Output Amps Max?

Posted on Sep 12, 2012

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1 Answer

What cause dc bus fault on 9120 power ware ups?

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

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This could be because of bad batteries or you need to adjust the float voltage. First replace batteries

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Replaced old 12 V, 33 AH batteries for Ferrups 3.1 UPS. Within a min from starting the UPS, those two huge capacitors (situated on the Top Rear, when you remove the Cover, furthest when you see from the...

Mike Decamp is clueless. That is not a answer. The UPS has large DC capacitors. These do go bad over time. The capacitors are required to maintain a good DC Buss and helps in assisting when putting the UPS in bypass and back online. You can not turn on the inverter with out precharging the capacitors. Get the part numbers of the caps and replace. Make sure UPS and batteries are off or you will get shocked.

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2 Answers

Dc bus faulty

Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault.

These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.

The true UPS types are usually the higher KVA units (over 1500 VA) that supplies uninterrupted mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power therefore there is no switch over time lag from the mains to the battery.

Oct 22, 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

11 Answers

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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