What if the UPS does not hold or does not turn on?

In this article I will share with you the method of diagnosing and troubleshooting an uninterruptible power supply (UPS). So, why can a bespereboinik not turn on or not work from the network? one of the first reasons, a fuse has blown, a transformer or a control board may have failed, but in our case it is a little different, but at the same time a very elementary problem ... Let's understand more ...

Repair the uninterruptible power supply with our own with hands

At the very beginning, before disassembling, we need to check if the fuse is working, it is usually located on the back of the UPS
What to do if the UPS does not keep or does not turn on
Remove it and check it with a multimeter in the dial mode. In this case, the fuse is working.
What to do if the UPS does not hold or does not turn on
disassembling directly the uninterruptible power supply (UPS) I want to note that the disassembly method can be distinguished from your UPS model, but should not cause you particular difficulties in disassembling. Unscrew the 4 screws and remove the lower part of the IPB.
What to do if the UPS does not hold or turn on the power
After disassembling, inspect the card for external damage to components. In our case, no damage was found.
What to do if the UPS does not hold or turn on the power
The first step is to check the battery (AKB). We measure its voltage with a multimeter. In our case, the battery is discharged to 2 volts, which is naturally not good and is deep enough discharge.
What to do if the UPS does not keep or does not turn on
Check the battery for charge-discharge by connecting it to the laboratory power supply unit for recharging to eliminate the possibility of its breakdown. As it turned out, the battery refused take charge of the laboratory power supply, this meansthat there is a break somewhere and, accordingly, our battery is faulty.
What to do if the UPS does not hold or does not turn on
Take another battery to check. In my case, it has a bit more capacity. Accordingly, the UPS should keep the charge longer and fit perfectly into the case from the UPS!
What to do if the UPS does not hold or does not turn on
Connect the terminals - let's start the test without assembling the case. Started.
What to do if the UPS does not hold or turn it on
We measure its voltage: - 12.4 volts. What to do if the UPS does not hold or turn on the power
To make sure that the battery is charging, for a few seconds we measure the voltage at the battery terminals when the UPS is plugged into the network. The voltage should gradually rise. 12.9 volts tells us that the battery is charging, the UPS is working, it can be assembled and put into operation.

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