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UPS overload light

UPS overload light

UPS overload light

We have an APC 650, as a power source for a server, and it has been working several years without a problem. Then recently it sometimes shuts down the server.  The overload light went on today, yet there is nothing else except the server plugged into it.  The monitor is plugged in another oulet. However there is an air conditioner plugged in a nearby outlet. We're wondering if that may lower the line voltage and cause the UPS overload light to go on?

RE: UPS overload light

You've likely identified the problem. If you can't move the air conditioner or the UPS to separate circuits, you might invest in a Line Conditioner - APC makes those too - that will step up a low or dipping voltage automatically. Get one with enough VA rating for your UPS - suggest 1200VA size to start. Used to have problems with secretaries who'd put heaters under their desks. Couldn't get them to wear slacks and boots, or the boss to forbid heaters, so we put line conditioners on their PCs. It cured the problem, for the PC at least!

Fred Wagner

RE: UPS overload light

Much appreciate the suggestion.  We will look into getting a line conditioner because the power in that area of the building might not be even, the lights are said to flicker sometimes.

RE: UPS overload light

Running diagnostics on the UPS showed it had an electronic problem. Problem was fixed by getting a new UPS.

RE: UPS overload light

Hi Dave,

If you have an AC or other high power consumer on the same line, the only thing that can happen is that the voltage on your line goes under the voltage threshold at which the UPS decides to go on battery.

So, the only thing that can happen is that your UPS get discharged, but a low-voltage or noisy line will not cause the overload light to go on.

Mind that you can adjust that threshold voltage on all APC UPS, it is set at 180 V (factory) and can go down to 162 I think.  This means that with this last setting, if you have 163 V on your line, which is really low, your UPS won't use the batteries yet.

Of course I've read that you finally solved the problem that was a UPS problem, but I like to comment in case you get a similar problem in the future.


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