Dell PC turns off while shifting to backup power

January 3, 2017 at 22:58:52
Specs: Windows 10 Pro x64, 2.793 GHz / 4096 MB

Alright so here's the issue. I have a total of 3 PC's at home. We have a lot of power cuts here and use a Backup UPS interter for the the PC's.

I recently had trouble with one of my PC's and had to change to motherboard. So I took a Dell system I had lying around and put in my processor, RAMs and HDD and set it up.

Now the Dell PC won't shift to backup power. It restarts everytime it tries to shift to the backup power. The other two PC's work fine on backup, they transfer to backup power just fine.

What could be the issue here with the DELL system.

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message edited by agalpha

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January 4, 2017 at 02:10:25
I don't understand "shift to backup power".
What kind of UPS do you have? Any model/brand?
My understanding of a Uninterruptible Power Supply (UPS) is that the devices connected to the UPS will continue (uninterrupted) being powered after the MAIN AC is cut-off. The duration of backup power depends on battery capacity of the UPS. It should give you enough time to continue current operations and shutdown safely if MAIN AC power does not return within a specific time.

How does your UPS system setup differ?

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January 4, 2017 at 02:36:43
The type of UPS you are using may not be compatible with your Dell PC. It may need to be a "Pure Sine Wave" (PSW) type UPS.

See this:

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To sluc: "Shift to backup power", it should be quite obvious what that means, what's difficult to understand? It simply means the PC switches over from mains power to UPS backup power when there is power-cut. Except in this case the Dell PC isn't doing that.

message edited by phil22

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January 4, 2017 at 14:25:55
I am using a Pure Sine Wave UPS system. By shift I mean when there is a power cut and the system moves from the main to the UPS without interuption.

The UPS system that I am using is from a Local Brand here in Pakistan called Sigma.

Its a Pure Sine Wave 2500VA with two 150Ah batteries hooked up to it.

Been using this same set up for 1.5 years now. Have a total of 3 PCs hooked up. 2 of them are working fine and do not restart incase of a power cut but the dell I just started using is restarting during a powercut.

Batteries have no issue and the two other PCs are able to run for 2.5 hours on the backup without issue.

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January 4, 2017 at 14:38:53
Sounds like the Dell's PSU is getting old and weak. I suggest replacing it.

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January 4, 2017 at 16:23:04
The UPS' we use here in the USA supply continuous power to the PC's irrelevant of the power coming into them. You plug them into the outlet and the computer into them and the power is uninterrupted. Internally the battery makes up for any drop in voltage so it does not matter what computer is plugged into it, the computer does not know there is a problem except that the UPS sends a signal to Windows that tells it that you are running on battery power and it should shift to battery mode in power settings. There may actually be a problem with the computer but I would say there is something wrong with the UPS. You can try switching the UPS's between that computer and one of the others and seeing which computer has a problem the next time the power drops out.

You have to be a little bit crazy to keep you from going insane.

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January 4, 2017 at 18:09:33
Does the Dell BIOS has a feature called "Surge Protection"?

@Phil22: UPS systems I have been working with in most of my projects do not SWITCH! Incoming AC is filtered and rectified, keeps batteries charged. Inverter delivers CONTINUOUS stable AC out.

I assumed the OP uses this kind of UPS:

message edited by sluc

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January 4, 2017 at 20:49:36
Have you tried a different power cord on the dell and a different UPS connection?

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