Question about Powerware 9120 UPS System
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,
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
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
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
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
Try to change the battery inside with a new one. good luck!
Posted on Feb 13, 2007
I think you have to change the PSDR board inside the UPS.
Posted on Mar 13, 2009
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
It is both condenser 3300 mf 450 V that it is necessary to change
Posted on Jun 14, 2009
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Posted on Jan 02, 2017
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