Question about Powerware 9120 UPS System
I turn on the UPS without anything connected to it. It stays a few seconds on "On Line" then it changes to Low O/P V
What can be the problem?
Fault: Low Ouput Voltage
Cause: Surge Taken by load / Short Circuit on load / Fault in inverter
Remedy: Remove load and restart UPS / Try a different load / Repair or swap out
If you need spares or price for repair contact Eaton Power Quality Ltd - the new name for Powerware - 01753 608700
Posted on Jun 17, 2009
Hi to All
I had the same issue where the UPS started (loaded or not) and immediately sounded an alarm with Low O/P V and it tripped the breaker at the mains. Tried starting the UPS with no power to the device as well (cold start) with no success.
I removed all batteries to reset the UPS and powered up again, same thing happened.
I then moved the UPS without any batteries to another power point in my home (different breaker on the mains) and device booted with "DC bus Fault"
Powered everything down, loaded all the batteries and it booted up 100%!!! So it turned out to be the breaker for that location... Worth a try and will save you allota tom!
Posted on Apr 08, 2014
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Posted on Jan 02, 2017
Tips for a great answer:
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Automatic: The UPS performs a self-test automatically when turned on, and every
two weeks thereafter (by default). During the self-test, the UPS briefly operates the
connected equipment on battery.
Manual: Press and hold the button for a few seconds to initiate the self-test
REPLACE BATTERY LED ILLUMINATES
Replace Battery LED flashes and
short beep is emitted every two
seconds to indicate the battery is
Check that the battery connectors are fully engaged.
Weak battery. Allow the battery to recharge for 24 hours. Then, perform a self-test. If the
problem persists after recharging, replace the battery.
Failure of a battery self-test. The UPS emits short beeps for one minute and the Replace Battery LED
illuminates. The UPS repeats the alarm every five hours. Perform the self-test
procedure after the battery has charged for 24 hours to confirm the Replace
Battery condition. The alarm stops and the LED clears if the battery passes the
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