From: Gary Britt 

Where's "Fred Sutton" when you need him??

I think I remembered that name correctly.

Gary

RobertB. wrote:
> Any EEs out there or people who know electricity? I have two APC UPS
> SmartUPs in my office, a smallish 750 VA unit attached to my G4 iMac and
> a large 1000VA unit attached to my ancient Micron and my new iMac
> core2duo (Yowza!).
>
> Here's the deal. Previously, I used to not turn the Micron on much so I
> would shut the large SmartUPS off at night (since the computer was only
> on a couple of days a week at most). However, the new iMac, like all
> Macs, has an Energy Saver feature, so I simply put it to sleep at night.
> Easy. When it's on, the usage light on the large SmartUPS doesn't even
> go on, the machine is energy efficient. (The Micron, which has a couple
> of externals attached causes it to move up one notch). So there's no
> real voltage draw. OK. I noticed, twice now, that in the morning when I
> come into the office, the Voltage Trim light is on, indicating high
> voltage on the line. However, it only appears on one of the SmartUPS.
> Both machines are in the same room and, as far as I know, connected to
> the same circuit. After a while, the Trim light goes out.
>
> FYI, about two weeks ago, the same thing happened one night to the 750VA
> UPS. The Voltage Trim light was on for several hours, then went out. I
> have no idea why it would affect one UPS and not the other, why it seems
> to happen on a regular basis, and why it would come and go. The owner of
> the building (an old tenement) installed a new boiler about six weeks
> ago and I'm wondering if they did something weird. At one point this
> summer they were running new cabling up the walls on all the floors, but
> I have no idea if they ever connected the stuff. I can't figure it out.
> The voltage trim light just went out about 10 minutes ago. Bizarre.

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