My company was the ILL/WI rep company for APC back in the beginning years.
You know the story, once the commission checks got big, they put on direct
sales guys.
Anyhow...there are some differences in 'UPSs' for all to be aware...
Most UPS are not ups..even the APC models. They are SBS Standby Power
Supplies, which are off till the power fails, and only then turn on.
Usually within 4-7 milliseconds, which fast enough before the computer
power supply signals a loss of power to the motherboard. SBS usually offer
some degree of surge protection, MOVs or something on the outputs. Some
work very well.
A "TRUE" UPS... actually manufactures the output power ALL the time,
which may be a modified square wave ( a stepped square wave, to look like
a sine wave) or an actual sine wave. Imagine a that is it a 60 cycle audio
amp !!! with a kilowatt output.! (heat sink & fan). By being locally
created & ON all the time there is no pass thru of surges, or noises from
the utility power lines. Upon utility failure, a UPS runs off the
batteries, rather than charging them. ALLWAYS more money than a SBS but
usually VERY clean. If it's humming or buzzing & making a fan noise ..while
the utility is up...it's probably a UPS. If it's quiet, just sitting
there, it'as a SBS. ITT & others resold Itaka (Japan) private labeled
stuff. Fine UPS.
Now determine which type YOUR loads needs, SBS or UPS.
bill
NY9H pictures on Epson's Photo site ;
http://albums.photo.epson.com/j/AlbumIndex?u=1771119&a=13683578
mailgoesto:ny9h@arrl.net
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