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BK650EI high frequency noise

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.

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R00KIE_apc
Cadet
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BK650EI high frequency noise

This was originally posted on APC forums on 12/2/2012


I have bought a BK650EI UPS a few days ago and as soon as I plugged it to the wall socket I noticed a high frequency noise coming from the UPS, the type of noise made by a bad or faulty switchmode power supply. According the the warranty state check on the website, the UPS was manufatured in July 14, 2012.

The noise is quite distracting and irritating, I have noticed that when the battery is being recharged after a discharge the UPS is completely silent, which is what I expected this UPS would be (except when working on battery). My experience with a BK650MI which I own, and a Back-UPS RS 1500 LCD is that the units are completely silent when they are on standby and have their batteries fully charged.

I have recorded the noise and from the spectral analysis it seems to be a mix of frequencies above 10kHz with a pronounced peak around 12kHz so this is clearly not a hum related to the mains frequency.

I was wondering if this is a known problem with this model or series or if the unit should be replaced or repaired.


Accepted Solutions
BillP
Administrator Administrator
Administrator
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Re: BK650EI high frequency noise

This reply was originally posted by Chris on APC forums on 12/3/2012


I have no heard of this issue however I haven't personally dealt with any models other than US versions. Regardless, I would suggest you contact your local tech support for an RMA. If anyone else does have any experience with this frequency issue, please let us know.

See Answer In Context

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BillP
Administrator Administrator
Administrator
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61

Re: BK650EI high frequency noise

This reply was originally posted by Chris on APC forums on 12/3/2012


I have no heard of this issue however I haven't personally dealt with any models other than US versions. Regardless, I would suggest you contact your local tech support for an RMA. If anyone else does have any experience with this frequency issue, please let us know.