X config damaged by power failure

[Mikkel L. Ellertson]

g wrote:
> 
>> On Wednesday 30 April 2008 01:00:32 pm Mikkel L. Ellertson wrote:
>>> It could be the time it take to switch between line power and
>>> battery. It tends to be more common with fully loaded power
>>> supplies. There is not enough reserve in the filter caps or
>>> something to carry over the loss of a cycle or two. A UPS that
>>> will also compensate for line voltage tends to have less of a
>>> problem with this because there isn't the abrupt changeover.
> 
> this is incorrect. ups = uninterruptible power supply.
> 
> dc to ac conversion is done with mains floating battery and ac conversion
> circuit draws power form battery. this is what maintains continuous ac
> output with out interruption.
> 
> 
It is supposed to be uninterpretable, but in practice, low end UPSs, 
especially the ones sold for home or home offices, have a changeover 
time when AC fails. It is only a cycle of so, but it is there. They 
are not designed to be providing continuous AC. These units should 
properly be called a battery backup, and not a UPS, but you know how 
marketing is.

I have worked with true UPSs, but most of those were 480 volt, 3 
phase, with a room full of batteries...

Mikkel
-- 

   Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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