sosaited
Newbie level 3
![Newbie level 3](/styles/images/ranks/alevel3.gif)
Hi.
I have a 1000va UPS that I use for my Computer as their are numerous blackouts in my area. Recently I moved to a new location and for a few days initially, the mains voltage kept dropping too low (~170-200v instead of 220/230), during which time the UPS would go to the battery, but after it will run out in a few minutes, it will turn off (The on-battery indicating LED would turn off) but it would continue to beep and supply the same input voltage as it was getting to output (which didn't cause my computer to restart). This kept happening for about 7 days, after which the voltage was fixed (215-220v). But now since a few days, it is not charging the batteries fully (my own opinion, could be something else) as it turns off within a second or two after the power fails, if the computer is turned on when it happens. I have also noticed that one of its relay switches after few minutes of power returning, which I am guessing is the one that charges the batteries.
I am posting its front side of the main PCB in the hope that someone can please tell me what is the purpose of the two VR at the bottom left, and if I can adjust any of them to make sure that it will charge the batteries fully, or if I need to check any other components with a multimeter. There are two 12v 7Ah batteries in it, one was at ~13v and the other at 11.9v after I had it connected to mains for more than 8 hours.
P.S: When I checked its output volts on battery, without load; it was at 160-170v only.
Thank you.
I have a 1000va UPS that I use for my Computer as their are numerous blackouts in my area. Recently I moved to a new location and for a few days initially, the mains voltage kept dropping too low (~170-200v instead of 220/230), during which time the UPS would go to the battery, but after it will run out in a few minutes, it will turn off (The on-battery indicating LED would turn off) but it would continue to beep and supply the same input voltage as it was getting to output (which didn't cause my computer to restart). This kept happening for about 7 days, after which the voltage was fixed (215-220v). But now since a few days, it is not charging the batteries fully (my own opinion, could be something else) as it turns off within a second or two after the power fails, if the computer is turned on when it happens. I have also noticed that one of its relay switches after few minutes of power returning, which I am guessing is the one that charges the batteries.
I am posting its front side of the main PCB in the hope that someone can please tell me what is the purpose of the two VR at the bottom left, and if I can adjust any of them to make sure that it will charge the batteries fully, or if I need to check any other components with a multimeter. There are two 12v 7Ah batteries in it, one was at ~13v and the other at 11.9v after I had it connected to mains for more than 8 hours.
P.S: When I checked its output volts on battery, without load; it was at 160-170v only.
Thank you.