UPS clicking and turning off power

[Anonymous user]

Hello, I have a UPS unit that is "clicking" and will turn off whatever is plugged into it almost at the exact time every day (noon) and sometime during the evening, as the computers will be off when coming back to the office.

#1   APC PRO 1000VA

2 years old (2 computers)

Product Serial # 3B1144X03456

#2  APC PRO 1500VA

1 month old (no load, but clicking can still be heard on this unit, more frequently than the older UPS)

Product Serial # 4B1250P07576

Now, I have a feeling that something is going on since the 1500VA is brand new, yet still doing clicking.  Had the electrician come out, but said nothing was out of the ordinary.  Nothing appears to be wrong with the units (not throwing any lights/anything other than the clicking and turning the loads off).  The issue seemed to start happening about 2 months ago on the old one, and has always done this on the new one.

I have tried to search but don't really see this as a frequent issue.

Please advise.

[BillP · Accepted solution]

Do you see any indication the clicking is the UPS transferring to from battery (so often that it exhausts its battery and turns off)? I guess that makes me also want to confirm when you find the computers off, do you find the UPS off as well?

If this is some type of power fluctuation issue caused by something on the electrical circuit (printer, soda machine, etc), you could at least start by lowering the sensitivity on the units. The instructions for doing this depending on the unit model should be in the user's guide and if these units have LCDs, you can do it by there.

Lowering the sensitivity will lower the UPS's sensitivity to power fluctuations where I think most UPSs are set to a high sensitivity by default.

I based this on "clicking" usually meaning the UPS is switching from Online mode to on battery mode very frequently and depending on the specific scenario, could cause the load to turn off because the battery becomes exhausted or the load is sensitive also to the frequent transfers and the time associated with the transfers.