pc restarts on UPS without power cut

[Neil Sharma]

i have 2 pc

AMD 8350 fx
16gb ram
amd r9 270x
650W corsair vs PSU
corsair h80i Liquid cooler.

UPS; intex 600va ( http://www.intextechnologies.com/webpages/producthomeups.aspx?pro_name=600VA%20Style&category=Computer%20Peripherals&subcat=UPS&subcat1=600%20VA )

i want to ask when i cut my power the UPS is giving supply but when there is no power cut some small flactuation happens to my system and it automatically restarts ....and some times on power cuts also the system boot automatically.

 

[James Mason]

Your 600 Va UPS only provides 420 watts of power:
http://www.cybermarket.co.uk/shop/power-supplies/voltage-conversion-help.html
http://www.tomshardware.com/forum/327745-28-will-600va-600w

That's probably why.

 

[Neil Sharma]

but i want to know why does it flactuates when there is no power cut.....

it provide backup when a power cut occurs.......

 

[GhislainG]

You are correct, but I would presume its efficiency is 65% and it therefore delivers 390W. If the PSU is inefficient, then the UPS isn't powerful enough.

Neil, do you have issues if you connect the PC dierectly to the outlet? Is the PC the only component connected to the UPS or do you also have other equipment like a monitor, modem, router, etc.? What PSU do you have?

 

[Neil Sharma]

You are correct, but I would presume its efficiency is 65% and it therefore delivers 390W. If the PSU is inefficient, then the UPS isn't powerful enough.

Neil, do you have issues if you connect the PC dierectly to the outlet? Is the PC the only component connected to the UPS or do you also have other equipment like a monitor, modem, router, etc.? What PSU do you have?

i have Corsair VS 650w. i dont get issue on direct power some times during flactuations t restarts on ts on (no shutdown)

 

[GhislainG]

The power fluctuations have to be quite high to cause a system reset. Your system shuts down when on the UPS because it just can't take the load. You should get a pure sine wave UPS (better when using a an active PFC PSU) that's powerful enough not to shut down. CyberPower seem to have relatively good pure sine wave UPS at a decent cost. I suggest you get at least a 1000 VA (600W) UPS.

 

[James Mason]

The power fluctuations have to be quite high to cause a system reset. Your system shuts down when on the UPS because it just can't take the load. You should get a pure sine wave UPS (better when using a an active PFC PSU) that's powerful enough not to shut down. CyberPower seem to have relatively good pure sine wave UPS at a decent cost. I suggest you get at least a 1000 VA (600W) UPS.

I agree.