Question about Powerware 9120 UPS System

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My ups has is faulty i need a circuit diagram to fix it

Circuit diagram for powerware 9120 ups

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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.

Posted on Dec 09, 2010

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I am haji ijaz ahead form gujaranwala
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I can convert apc ups 48V to 24V

Posted on Nov 04, 2014

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Short backup time


Suspect battery failure/faulty cell in a batt
Remove batts and check outside unit
charge up to around 2.27V/cell then check discharge on each batt (12V car lamp is good dummy load)
faulty one will be obvious.

MAKE SURE YOU ARE VERY CAREFUL WITH BATTERIES, THEY ARE VERY DANGEROUS, AND ALWAYS LIVE!

Check you manual for safety procedures, BEFORE working on Batteries.


hope this helps

thanks for using Fixya

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