On Mar 26, 2011, at 2:06 PM, Bruce Johnson wrote:
You can also get an alarm on low mains voltage. Best answer is to
RTFM.
Low mains usually dims the lights, too, at least when it's enough to
trip the UPS alarm.
I seem to get this fairly often, and the lights only dim perhaps one
of three times. Another third of the time I hear a major appliance
kick on just before the alarm, this can be a washing machine, or a
refrigerator compressor, or an air conditioner. The final third of the
time there is no outward sign, the alarm just goes off on it's own.
It's a major hassle because resetting the alarm will kill the Mac,
which makes zero sense to me since the whole idea of UPS is
"uninterrupted power" so you'd think that you should be able to reset
the alarm without interrupting the power, but that's not how it works,
so I must then Shutdown and reboot.
I've got two of these units, and both test out good for the batteries,
so I'm assuming I've got some sort of voltage issue with my mains. My
house is fairly new, and I've never had problems with electricity for
any other uses other than these UPS alarms going off about once a week
or so.
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