lucky said:
Got my Belkin 1000 hooked up and it seems now have 2 beeps upon boot up
and the same 2 when I shut down. I'm keeping the belkin 'on' all the
time because the noise turning that on would wake up my wife. I just
shut down and let the computer 'on' and turn off the monitor.
One other weird problem is when I turn on the PC, then switch on the
monitor, the belkin screams for a second. Is this because of the draw of
current for starting the monitor? I've started just the monitor first
from now on but it still happens occasionally.
I take it this is a Belkin UPS ?
http://web.belkin.com/support/download/files/ups2-Brochure.pdf
What is funny, is my APC 650 doesn't make a squeek when I switch on my
19" Trinitron monitor.
When I look at the feature set, the Belkin has AVR, and perhaps that
is responsible for the screaming when the monitor is switched on.
There are very few true UPS. A real UPS does AC-DC-AC conversion
all the time, and will dissipate heat while doing so. It doesn't
"switch over", because it is, in effect, always running on battery.
You can tell you've bought a true UPS, by the large hole in your
wallet.
The rest of these devices are SPS (my APC 650 included), which
stands for Standby Power Supply. Under normal circumstances, they
pass AC-AC straight through, so the device dissipates no heat.
Some AC-DC rectification is done, to charge the battery.
When the SPS detects that the AC on the primary side is out of
spec, you might hear a relay switch over the device to run off
battery. At this point, the device is doing DC-AC conversion.
It will also become more load sensitive, as the DC-AC switching
converter has limits on how much power can be provided. A heavy
inductive load won't be appreciated by the device, if it is switched
on while the device is running from battery (although I haven't had
problems switching on my monitor while running from battery).
A possible complication on the Belkin, is that AVR feature. The
AVR would appear to be a simple boost tap that cuts in if a
brownout is detected on the primary. This could be done with
an autotransformer, for example. Maybe there is an interaction
between the use of the AVR, and the use of a heavy inductive load
like the degauss coil in the monitor ? If the Belkin were to monitor
the point after the AVR, to detect loss of AC on the input side,
it might become more sensitive to loading when running in AC-AC mode.
I would think a UPS without an AVR feature would be less sensitive
to load (because the AC-AC path is just a piece of wire then), but
of course, would leave you more exposed to the effects of
brownouts.
I'd suggest contacting Belkin, but what are the odds of finding
someone knowledgeable about UPSes ?
Just a guess,
Paul
