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a buzzing sound from the SMPS when pc runs on Back-up UPS

N

nix253

Member
a buzzing sound from the SMPS when pc runs on Back-up UPS
hey guys i just bought a new APC Back-UPS RS 1500 (BR-1500-IN) which also happens to be my first APC product and i really like the features especially the auto-shutdown software and other software-supported monitoring.

but the issues is that whenever i run SELF-TEST from powerchute personal edition or if i switch off the main AC supply (just like in case of power outage) and the PC runs on battery back-up then there's a strange "buzzing" sound that comes from my PSU/SMPS. had the sound been feeble i wouldn't have cared much but sound is quite loud, if not extremely loud.

so what do you guys think could be the reason n how much chances are there that it could harm my pc in some way or the other n upto what extent?

also the power outage in the area where i live isn't too frequent but still every once in a while it is there.

n the settings that i've changed in the powerchute software is
Sensitivity-High and Runtime on Preserve battery option with computer to be shut-down after 1 minute.

the specs are as shown in sig. with display being connected separately and not on the UPS.
 
thanks for replying... so are you saying that you also get the buzzing sound due to the stepped sine wave or your cyber power UPS outputs pure sine wave?

n since i won't let my PC stay too long on battery back up (<2 minutes) especially now due to the buzzing i don't think it should be a problem, will it be?
 
The CyberPower doesn't give me anything but power when it's running from the battery.
The only sound that ever comes out of it is the beep alarm when the house power is out.
 
I'd suspect that it's because the UPS isn't giving you the pure sine wave the that PSU expects. I doubt that Blain's Cyberpower is any better, but his PSU may be more tolerant of it. The Cooler Master GX series is fairly trashy after all.
 
Square wave inverter output (usually called 'modified sine' even though it is anything but) will cause a lot more noise from the aPFC boost inductor, because of the rapid change of voltage.

This shouldn't damage anything as the overall currents are still the same.
 
well i have been running cooler master gx 750 for 6 months now..... i wouldn't say it's "trashy"........ it may not be able to compete with the best in the 750w segment but definitely not worst......

as for the buzzing noise like i said i won't let PC run for too long on the battery cuz i'm always at home when it's running .... maynot be near the pc everytime but ya .... i mean there won't be a case where i'll let the the PC run on UPS battery with the buzzing for more than 3-4 minutes... so now with that point in consideration do you guys think it'll be ok if i keep this 'stepped sine wave' one?

actually where i stay it's hard to get things replaced even if in warranty .....so....
 
Blain said:
How dare you sir!
Click to expand...

:awe:

nix253 said:
well i have been running cooler master gx 750 for 6 months now..... i wouldn't say it's "trashy"........ it may not be able to compete with the best in the 750w segment but definitely not worst......

as for the buzzing noise like i said i won't let PC run for too long on the battery cuz i'm always at home when it's running .... maynot be near the pc everytime but ya .... i mean there won't be a case where i'll let the the PC run on UPS battery with the buzzing for more than 3-4 minutes... so now with that point in consideration do you guys think it'll be ok if i keep this 'stepped sine wave' one?

actually where i stay it's hard to get things replaced even if in warranty .....so....
Click to expand...

Yes .................... it .......... will be fine ........... don't ......... worry ...... about it. All the .......... UPSs ........ in ............ this .......... price segment .......... are going to be some sort of modified sine.
 
ok guys today i tried something n this is what i found out... till yesterday i had my pc, modem and speakers connected to a belkin power surge protector which was actually connected to the UPS. but today i thought of trying out connecting my pc directly on ups and see if humming goes out. well when i did the humming didn't go out totally but it was significantly reduced. so i'm thinking of keeping my pc directly to the UPS.

the only concern i'm having is that my pc may not get the extra protection which it was getting through the surge protector. so is the surge protector necessary or it's ok to use my pc directly on UPS? i think UPS also provides protection from surges upto a certain extent don't they?

here's the page on the surge protector:
http://www.belkin.com/in/IWCatProductPage.process?Product_Id=481734
 
Did I miss where you told us about the Belkin? :hmm:
Surge Protectors Should NEVER Be Connected In-Line Into A UPS.
 
Last edited:
i missed to tell you guys about it i think... but can UPS also provide surge protection? because there is a little power fluctuation in my area every now and then so.....
 
Blain said:
Did I miss where you told us about the Belkin? :hmm:
Surge Protectors Should NEVER Be Connected In-Line Into A UPS.
Click to expand...

Echo that! Better read the APC/UPS manual. It specifically warns against using another surge protector in the system. The UPS IS a surge protector in addition to battery backup.
 
corkyg said:
Echo that! Better read the APC/UPS manual. It specifically warns against using another surge protector in the system. The UPS IS a surge protector in addition to battery backup.
Click to expand...

:thumbsup: Your UPS isn't a true double-conversion unit (which provides virtually unlimited surge protection), but it is a lot better than some cheesy power strip.
 
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