APC UPS for Home and Office Forum
Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.
Posted: 2021-06-29 08:31 PM
This was originally posted on APC forums on 6/23/2013
Hello everyone
I purchased an APC BR550GI 2 days ago to use for my pc.
I hooked it up and and my surprise it make a very annoying buzzing noise with a weird repetitive sound every 5 seconds.
It didnt seem normal to me although the sound could be heard from a distance of about 10m. ( there is a video i shoot with the sound here--> Apc br550gi ups buzzing sound - YouTube )
I thought that i better wait for the battery to be fully charged (although the indication of battery was showing that it was fully charged which i found weird).
Now 24 hours later, the volume is decreased but there is still a weird and repetitive sound every 5 second . Here is a video Ups apc - YouTube
The problem appears even with zero load(nothing plugged into the unit) or with my pc pluggin in.
I really cant stand the noise and doesnt seem right to me. ANy clues? Something i can fix myself? Should i return it?
Posted: 2021-06-29 08:32 PM
This was originally posted on APC forums on 7/4/2013
i understand the buzzing sound that u can hear by going next to the ups, but a buzzing sound that wont let u sleep, watch tv and is more noticable that anything else on a living room and can be heard from 10m??...well, that AINT normal.
Got my replacement unit yesterday from APC and its running quiet. So mine was a faulty unit.
Posted: 2021-06-29 08:31 PM
This was originally posted on APC forums on 6/24/2013
UPS's sometimes produce mechanical buzzing sounds due to the high operating frequencies of their conversion/inverter stages, coupled with the tap-switching transformers which themselves can vibrate. The repetitive 5 seconds buzz could be a combination of two frequencies that are very close to each other causing a mechanical "beating" (difference frequency) when mixed together, or just some aspect of the UPS design that does some internal process in the conversion or charging circuits on a repetitive basis.
Posted: 2021-06-29 08:32 PM
This was originally posted on APC forums on 7/4/2013
i understand the buzzing sound that u can hear by going next to the ups, but a buzzing sound that wont let u sleep, watch tv and is more noticable that anything else on a living room and can be heard from 10m??...well, that AINT normal.
Got my replacement unit yesterday from APC and its running quiet. So mine was a faulty unit.
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