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ES 750 Reporting False Overload

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


ES 750 Reporting False Overload

This was originally posted on APC forums on 4/10/2009

A couple of days ago I started having trouble with my ES 500 which I've had for at least a few years with no problems. On at least two occasions and without any warning it beeped and then everything plugged into it just died--no graceful exit. I have no idea why. It just utterly failed. Not wanting Windows to get wrecked with more of this I went out and bought an ES 750. The 750 has been doing two things: 1) occasionally Powerchute makes an announcement noise and shows an exclamation point by the icon, and then goes away within seconds. I have no idea what it's trying to tell me, and 2) Less often, but twice today already, Powerchute has said the UPS is overloaded. What's interesting about that is I don't really have any more plugged into it than I did before, and out of 450 watts available it says I am only using 180 (200 at most). I have not noticed any overload lights coming on the unit itself, and it never beeps.

My system has a fairly new PSU (a couple of months ago) and is a dual-core AMD system. The PSU is a SeaSonic S12 Energy Plus 550W ATX12V V2.3. I don't do any gaming. I do have a lot of peripherals, but as I said, I ran these before without problems. Cable modem, router, hub, two external drives (only one stays on), scanner, printer and Boston speakers.

There are no events in the log. Do I need to change the sensitivity or voltage? What the heck is going on with this?