Re: Re: Mains activated extension socket

["David Gumbrell" <david.gumbrell@xxxxxxxxx>]

I guess this is one application where we are not going to need
proximity
detection :-)

Cheers

David

On 05/11/2007, Tim Hawes <timsyahoo@xxxxxxx> wrote:
>
>   You could do this a couple of ways, I think.
> Have a relay in the saw circuit start the extract fan, a second relay
> in the extract circuit latches-in the fan supply. An off button turns
> the fan of manually, or you could include a timer for delayed-off.
> I've knocked-up a circuit diagram for this one, let me know if you'd
> like it sent off-list.
>
> 2nd way would be to have the relay in the saw circuit as before, but
> contact-closure is wired to the powerflash (I think). Powerflash turns
> on the extract fan but you turn it off via a minitimer, or whatever.
>
> HTH,
>
> Tim.
>
> On 11/5/07, Peter and Jane
<pandj.munnoch@xxxxxxx<pandj.munnoch%40btinternet.com>>
> wrote:
> > Chris
> > PIR appeals to me as really the extractor needs to start before
the saw
> or whatever.
> > FYI Axminster tools use a magnetic sensor on the motor of the
> woodworking machine.
> > Other part of pir logic that appeals is the delay before off.
Some tools
> start and stop a lot (eg chop saw). PIR timer would leave the
extractor
> running.
> > Still open to better ideas.
> > There is no indicator light any of the woodwoking machines, so
the
> photodetector idea is difficult.
> > What I really need is an inductive proximity sensor...but then
the
> timing circuit is beyond me.
> > Good 'ol x10..not good but not bad!
> > Rgds
> > Peter
>
>


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