APC Smart-UPS RT 2000VA RM 230V - Will Not Power Up

[Anonymous user]

We have an APC Smart-UPS RT 2000VA RM 230V.

Following a number of short mains disturbances at the weekend, the UPS will now not power up.

This is what I have tried so far;

• Checked all connections are secure
• Ensured the breaker on the rear panel had not tripped
• Changed the fuse in the mains cable
• Changed the mains cable
• Put a meter across the battery plug (the reading was a steady 110v)
• Left it plugged into the mains for two days

I also put a meter across two capacitors in the power supply, which also gave a reading of 110v. This may or may not be a fault, but when the battery, mains or both are disconnected, the capacitors discharge very quickly and sit at around 30v.

Occasionally, pressing the on / test button makes the fans start up and there is a brief beep for about a second...before the UPS is dead again. This happens on mains with the battery connected, on mains with the battery disconnected, and when the UPS has no mains connected (just the battery).

It seems to me like there may be a power supply fault with the UPS itself. If left on mains for a minute or two, the fans try to spin but are unable to - it is as if they are not getting enough power and make a ticking noise, but do not actually manage to spin. During the brief burst of power sometimes (as mentioned above), both fans spin up - which confirms they do work.

The batteries are good, although they may be low on charge due to the mains problems over the weekend.

Can anyone assist with any further suggestions?

[BillP]

Hello Damien,

I am sorry that you are having issues with your UPS. 

So that I can give you the best support, I need to get more information: What is the model and serial number of you UPS?

At this point, from what you are describing, you probably have bad battery in the UPS. You probably have an older smart ups that will not turn on without good batteries. 

Thanks,
Shanon

[Anonymous user · Accepted solution]

Hello Shannon

Thanks for your reply.

I will get the model and serial numbers as soon as I have access to the UPS again. Over the weekend, I may try slowly charging the batteries and seeing if that works.

The batteries were only replaced a year ago using a genuine APC pack.