20 Most Recent Eaton Powerware® 9120 UPS System Questions & Answers

Dc bus error is from charger o maybe inverter

Eaton Powerware®... | Answered on Jan 08, 2019


This unit has been replaced by the 9130. It is possible that the original power cell is low in power or not charging to full capacity.

Eaton Powerware®... | Answered on Feb 06, 2018

smps involves ac to dc and dc-dc switching at high frequency because the type of a transformer in smps is a high frequency transformer and a current gain due to the ferrite application.to do a dc to dc switching you need a mosfet,smps ic e.g uc3845,dc capacitor and some passive components.

Eaton Powerware®... | Answered on Oct 02, 2015

1st does this have external battery modules or is it only the Internal batteries on this unit? You can disconnect the EBM's and the unit doesn't alarm even removing the internals with EBM;s attached won't cause an alarm. But it you only have internal batteries, open the front cover by pressing in the sides on the bottom left and right and pull it out and up at the same time revealing a black cable with a small anderson connector, make sure it is connected. you can pull the batteries out to check them to be sure they are properly seated. By the way the UPS in the picture only went to 3000va so is the 6Kv a different model?

Eaton Powerware®... | Answered on Jan 10, 2015

You are correct. Make sure you have checked your fuse. Please Email me at [email protected] and I can get you a user manual. I will need to know what size UPS you have also. Is it a 1.5KVA or 1500VA or bigger?

Eaton Powerware®... | Answered on Oct 05, 2011

Maybe you have many overvoltage situations at your area, that the UPS can't handle. It's a good idea to put before the ups an overvoltage protection or a stabilizer. Ask the manufacture for the overvoltage protection of the ups that can handle.


Eaton Powerware®... | Answered on Feb 08, 2011

open the ups and check whether the battery faulty or not if faulty replace it, if ok then check mosfet or IGBT used in inverter section if faulty replace it problem wil be solved

Eaton Powerware®... | Answered on Feb 08, 2011

If UPS is displaying "Site Fault", it is doing its job correctly. Yoiu need to check the wall receptacle. Probably hot and neutral reversed by whom ever installed the wall receptacle.

Eaton Powerware®... | Answered on Apr 13, 2010

the manual covers this, it tells you to read alarm event code
messages they are not in number format but text.
in clear english the alarms.
RTM or call EATON, we are Fixya not EATON,ok>
most error common means bad batteries. 99% are.


Eaton Computers... | Answered on Dec 08, 2019

Hello Eugene

This is the only post that you have posted here on Fixya dot com, albeit you have posted this same thing twice. Therefore I suspect you asked the question elsewhere and then came here to complain about it!

I suggest you contact Eaton direct by phone.


Andrew - Fixya Moderator

Eaton Computers... | Answered on Dec 08, 2019

see the instruction booklet for that - - - or contact eaton directly.

Eaton Computers... | Answered on Dec 08, 2019

UPS used lead acid batteries which die after 3 or 4 years. Disconnect the power and open it to see which ones it uses. You will know they are dead if they have swollen or melted. Buy replacement batteries.

Eaton Computers... | Answered on Dec 08, 2019

learn that when you have black out.
the batteries TAKE OVER< and are huge stress on any battery like this,, and when the lights (AC power) turned the UPS tries to charge said batteries and are now bad.
time for new batteries, or let it beep for 24hours and hope the batteries can recover.
the manual tells you how to see if the batteries are bad and with errorcodes, on all UPS made. RTM read the manual first.
no 2 UPS are the same , unless are.
the first is battery voltage under charge, if too low that means
a cell in 1 battery is shorted. as the LOVE TO DO.

Eaton Computers... | Answered on Dec 08, 2019

no UPS stated, model.
how old are you batterie(s)
charging errors of most kinds means the battery is bad.
they can do that even year old, but mine last about 3 years on avg.
no battery in any USB with Gel Cells, last a long time.
a fraction of all else inside the box. in fact.
buy a new battery and put it in.

Eaton Computers... | Answered on Dec 08, 2019

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