UPS noise

[Mark R]

I've just got a new 600 kva UPS. However it makes a terrible squealing noise; really loud and high pitched and piercing.

I've got it in its own cabinet, but the noise is still a problem.

The seller says that this is normal, but it's really annoying.

 

[Compman55]

Not normal. Replace.

 

[Ayah]

600kva will sound like hell. 600va shouldn't, and most don't even have active cooling at that rating.

 

[Mark R]

Example of sound:
Link

You can hear the squealing behind the background fans. Note that this is down the hallway with the door closed.