SMT1500I intermittent loud buzzing

Anonymous user · ‎2021-06-27

Hello,

My SMT1500I that I bought about a month ago sometimes starts buzzing pretty loud as well as vibrates while it's buzzing. Usually it lasts for a few minutes and then goes back to normal. I checked and during buzzing it's not in AVR mode and it's not on battery. My guess is transformer is causing that. Is this normal behaviour for my UPS?

Thanks.

Anonymous user · ‎2021-06-27

Buzzing happens very rarely, once every 2 days, I think. And it goes away in a few minutes. I don't particularly mind it, as long as it's a part of normal UPS operation. My UPS loads are really low, 10-20% usually, I maxed out at 45% a couple of times, and at night I shut computer off so it's 0% load.

See Answer In Context

BillP · ‎2021-06-27

Hello,

How much and what type of load is on the UPS? How often is intermittent? It could also be because the UPS is charging - not sure if you noticed that was the case or not. I think some noise is normal for Smart-UPS - it could be vibration or some dull fan noise. It could also be because of whatever type of load/power supply is connected to the UPS output. I am not sure, depending on how intermittent it is, if you can see if you see the same behavior with no load.

In general, I would probably guess that it is normal but the questions above may help confirm or deny that.

Anonymous user · ‎2021-06-27

Buzzing happens very rarely, once every 2 days, I think. And it goes away in a few minutes. I don't particularly mind it, as long as it's a part of normal UPS operation. My UPS loads are really low, 10-20% usually, I maxed out at 45% a couple of times, and at night I shut computer off so it's 0% load.