UPS system has a Buzz

[Hessed]

hello..
my ups has a buzz when connected, but disappears in battery mode. I worry because this buzz is transmitted to my PSU and i dont know if this is dangerous. Thanks.

 

[scout_03]

did you check if the wall outlet is correctly wired and ground in it is good .

 

[Hessed]

Sorry.. i forget to mention that he had already verified.

 

[scout_03]

from what i read on the net most ups does humming sound did you try it in another outlet and does anyone where you live have a motor running in the same time look like there is nothing else you could ..

 

[Hessed]

Thanks for answer @scout_03 .. the only thing I was able to discover that I have no noise in one of the outlets .. but it's just stabilizer

 

[scout_03]

Thanks for answer @scout_03 .. the only thing I was able to discover that I have no noise in one of the outlets .. but it's just stabilizer

 

[scout_03]

then i would shurely test the other outlet could be a false ground or a bad connector but be carefull it is 240 volts line you could get something like this https://www.amazon.co.uk/kenable-Socket-Tester-Polarity-Checker/dp/B007JIRFYU