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.
Hi Vassilis,
Hi Vassili I can't locate the capasitors Can u post a photo of the circuit board of 9120 6kva
Iannis. This fix is for the 700va model. For now i have no solution regarding the 6kva model.
i encountered the same problem dc bus fault in liebert gxt can u give me a solution for this?
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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 !!!
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.
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.
Hi Ansah, where is the attached image, please ? Thanks
hi. in my 2pcs 47uf/400v, was ok but 100uf/50v was with big ESR and changing was helped, thanks a lot
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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
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.
Try to change the battery inside with a new one. good luck!
I think you have to change the PSDR board inside the UPS.
sayan
My UPS- Lever EM15 15kVA- shows " VDC BUS MEASURES ERROR" on screen. What causes this error? How can this be repaired?
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.
It is both condenser 3300 mf 450 V that it is necessary to change
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I got the same problem "DC Bus Fault"
Powerware 9120 DC Bus Fault
I have a Powerware 9120 that shows 'DC BUS FAULT' error on screen.
What causes this error? How can this be repaired?thanks
WHAT CAN CAUSE THE FAULT AND WHAT CAN BE DONE TO REPAIR IT WHEN IT DISPLAYS DC BUS FAULT
It is just te same problem, display of DC Bus Fualt on the LCD and the protected units went off.
Email me, please.
bypass not avail
thanks!! fixed my problem too.......
change the 2200uF and the 100uF
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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