Question about Computers & Internet
After reset "Alarm #191 Battery test failed (open cell voltage)" Alarm appear again two days later. Please give us any information what could be reason. Same situation we found on another UPS. When I disconnected main power supply they work correctly.
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Posted on Jan 02, 2017
SOURCE: UPS problem
Based on your post/description, two (2) possibilities:
1. electronic fault - main power/AC mains sensor which could be really just a relay; or
2. corroded fuse terminals or fuse holder.
The first is a bit of a challenge since different brands/models have different sensing circuitry design. Some can be as earlier stated, a simple AC relay while others could be a TRIAC switch with a DIAC trigger. Still, some could be an elaborate AD converter and a myriad of logic circuitry. Often, a service manual or at least a schematic diagram would be needed, however these are not that readily available and most often the tech or DIYer must resort to winging it. This of course would require familiarity with electronic circuitry and components, use of a DVM and a soldering iron. Extreme caution must be exercised since even with 12VDC supply most of the electronics are at least at 60VAC+ level.
The 2nd possibility would be of course be the easiest to determine and repair. Replace/clean.
Should the downtime & repair cost makes the project no longer economically reasonable, perhaps your best bet would be to simply replace the UPS since their prices are relatively low.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Apr 16, 2008
SOURCE: Apc ups legwerkin
You can also adjust the sensitivity of your UPS so that it will accept the Generator's supply. I had to set ours to low sensitivity to get them to work. Depending on your UPS model, you can either connect to it with the supplied USB cable and run powerchute software to set the sensitivity to low, or some models allow you to adjust sensitivity on the front panel. Good Luck!
Posted on Jul 01, 2009
This is normal in some lower end UPS's, the voltage can swing quite a bit, a drop of 40 seems like quite a bit but it's out of the question. It will also adapt to what is plugged in yes. Ultimately to test you would want to try it with something like an actual PC plugged in and make sure it stays running. I'd say otherwise it sounds normal to me.
Posted on Jul 10, 2009
yes a spike may destroyed the mov (metal oxide variastor) inside projector replace it problem will be solved spike comes in the case of storm and lightning strike apc ups are well protected from spike and surge
Posted on Mar 05, 2010
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