francisw19 Posted October 25, 2007 Share Posted October 25, 2007 Hello All, Last night there was a power outage in our area. Naturally, my APC Back-UPS RS 1200 did it's job and kept my PC running so I could safely shut it down. When I walked into my office to shut down my PC, I noticed that there was a 'buzzing' sound. I listened around the room and determined that this buzzing sound was definitely coming from my Corsair HX620W. This buzzing was a cause of concern for me - under normal conditions, this doesn't happen. With a little experimentation, I found that the PSU will buzz ONLY when my APC Back-UPS is running on the battery (it will still buzz weather the PC is on or off. However the buzzing stops when I kill the master power on the PSU). As soon as the UPS is back to running on the city power-grid, the buzzing on my PSU immidiately stops. I googled around a bit and I have read a discussion suggesting that the buzzing is caused by the Active Power Factor Correction on the PSU when the UPS outputs a 'Simulated Sine Wave' (sine wave that is not smooth). See discussion here: http://forums.isxusergroups.com/thread.jspa?threadID=376&tstart=0 The link above seems to explain why this happens. However, I would like to know: Will this cause any damage to my PSU? I don't mind the buzzing sound since I will only ever be on battery power a small percentage of the time. I just want to be sure this will not cause any damage. Any ideas if I should be looking for a different UPS or is this going to be OK? Thanks Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted October 25, 2007 Corsair Employees Share Posted October 25, 2007 With some UPS backups you will get buzzing with high efficiency PSU's. This will not damage any of the components in the system. Link to comment Share on other sites More sharing options...
francisw19 Posted October 25, 2007 Author Share Posted October 25, 2007 Thanks, RAM GUY! Sounds good...that's all I needed to know.:biggrin: Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted October 25, 2007 Corsair Employees Share Posted October 25, 2007 No problem, let me know if you have any more questions! Link to comment Share on other sites More sharing options...
antodn Posted February 22, 2008 Share Posted February 22, 2008 With some UPS backups you will get buzzing with high efficiency PSU's. This will not damage any of the components in the system. hi, so I can buy an APC that have a Stepped approximation to a sinewave and this will not damage PSU Hx620, right? Link to comment Share on other sites More sharing options...
antodn Posted February 24, 2008 Share Posted February 24, 2008 hi to all, i'm going to buy a corsair hx620 and a apc BR800I could someone tell me if there are problems with this APC? battery waveshape disgnal si stepped to a sinewave not a pure! Do I risk to break the psu with this type of signal, as it happens for Coolermaster? thanks Link to comment Share on other sites More sharing options...
antodn Posted February 25, 2008 Share Posted February 25, 2008 does any member of the staff know how to answer to my question? :[pouts: Link to comment Share on other sites More sharing options...
EliteKiller Posted February 25, 2008 Share Posted February 25, 2008 does any member of the staff know how to answer to my question? :[pouts: Please see the 2nd post. http://www.houseofhelp.com/v3/showpost.php?p=314261&postcount=2 Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 25, 2008 Corsair Employees Share Posted February 25, 2008 Using a battery backup will not damage the PSU. Link to comment Share on other sites More sharing options...
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