Fw: Re: Ceiling Lights & Local Control

["Gareth Cook" <gcook@xxxxxxx>]

Could you not use a powerflash module
inbetween the switched feed ?

Or does it only work on 12v/Low Ampage
circuits... ?

G.

Gareth Cook Senior Engineering Specialist EMEA ED, IBM SWG Lotus Park, Staines, TW18 3AG

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----- Forwarded by Gareth
Cook/UK/IBM on 14/02/2002 17:37 -----

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"Paul Gordon" <paul_gordon@xxxxxxx>
Today 17:28

.

Subject: .	Re: [ukha_d] Re: Ceiling Lights & Local Control .
Category:

I never said I'd thought it through!...

I guess there's no reason it couldn't by sited anywhere you like, The only
important thing being that it goes on the switched side of the LD11, so it
gets switched with the light fitting...

You're right about the dimming though, cos the dim level would alter the
input to the primary of the transformer, which presumably would
proportionally alter the voltage output on the secondary...

Presumably at some point (at a low enough dim level), that might actually
drop low enough for the controller to think the light was off?

However, if you're using an analog input, then the changing secondary
voltage is just what you want anyway, to work out the dim level, something
along the lines of 12V = 100%, 6V=50% etc...

Still need Keith to chip in and blow all this out of the water with some
insightful explanation of basic electronics principles that makes all this
impossible....

Paul G.


>Surely this might be a problem with dimming? Also, if it did work
>then why would there be a need for an additional wire between the
>light and the LD11, uf it is to be connected in parallel then
>couldn't that be done at the consumer unit connecting directly to the
>LD11 terminals. But I do think you might be on to something here, we
>need input from an electronics wizard, but there must be some way of
>detecting what is being sent out from the LD11 and getting that
>information into the controller.
>
>Regards
>
>Graham
>




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