Re: [OT] UPS advice

["Simon Coates" <ecolume@xxxxxxx>]

James,

The run-on fan is more likely to be there to avoid overheating other
components in the set than to stop damaging the lamp itself (I think???) 
As
for current draw then that depends if it's an electronic ballast or
conventional wire wound type. Electronic ballasts don't pull as much
current
at start-up as conventional ballasts.  An under-rated UPS will switch off
if
it's overloaded.  What's the TV's rating?  Remember that the VA rating will
be higher than it's wattage.  The worst case would be as follows:  if the
circuit power factor is 0.80, then a 400W TV would be 500VA - then add (say
20%) for start-up and that's 600VA.

Hope this helps

Simon


----- Original Message -----
From: James Hoye <james.hoye@xxxxxxx>
To: Ukha_D <ukha_d@xxxxxxx>
Sent: 21 November 2001 14:35
Subject: [ukha_d] [OT] UPS advice


> I have a 400VA (or maybe 600VA) UPS that I would like to put inline
with
my
> TV.
>
> The reason for this is that I've got an LCD rear projection model -
and
last
> time we had a powercut we were watching TV and I was worried that the
bulb
> might die because the cooling fan continues to run for a little while
after
> putting the TV into standby.
>
> With a UPS, if the worst should happen, at least I can put the set
into
> standby and the cooling fan will do its job.  Now, is the TV likely to
prove
> an awkward load for the UPS?  There's probably some sort of ballast to
drive
> the bulb - probably a metal halide variety - and these aren't a linear
load
> are they?
>
> BTW, new bulbs are 200 quid.... not quite as bad as some LCD projector
ones
> costing ~400 quid, but enough!
>
> James H
>
>
>
> For more information: http://www.automatedhome.co.uk
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