Re: Geovision Automation

[Marc Fuller <groups@xxxxxxxxxxxxxxxxxx>]

Hey Kevin,

Excellent, many thanks for the good explanations Kevin. I think I've got
a good idea on what to do now. I found a relay at maplins that looks
perfect for the job.. just need to explain this all to the sparky now :)

Many thanks matey,


Marc


Kevin Hawkins wrote:
>
>
> Hi Marc,
>
> You're along the right lines... :-)
>
> Bascially the rating on the Net I/O card indicates what sort of
> current it could switch if it was run at that voltage - the 125V
> probably being the highest voltage it can be used at and probably an
AC
> (rather than DC rating). You could actually use it any any voltage
upto
> the 125V. Since you need to switch 230V mains this is somewhat
> acedemic and so you should correctly go for a 12V relay with 240V
rated
> contacts rated at a bit above whatever you wanted to switch current
> wise. You mention 16A - that's a lot of current and running costs ,
> just under 4KW of lighting ! Anyway being over on the current rating
on
> the relay is a good thing although it will make the relay clunkier and
> costlier.
>
> Yes - you only need SPST if you want the lights to be ON when
> energised, if you need anything else to be on when NOT energised then
> get a SPCO (changeover) instead. Only if you had two separate fused
> feeds for segments of this lighting then you might want DPST (dual
pole)
> or two relays Consider the mounting of the relay and how it will be
> wired - so that your sparky can do a neat and safe job. Maybe it can
> mount in your consumer unit on the DIN rail for example if you have
> one. You can buy small plastic boxes that hold a few inches of DIN
rail
> as well . Some relays plug into a base that mounts on the DIN rail. As
> this is external lighting you will need appropriate cabling outside
and
> you will also need current leakage breakers (MCB's) on the circuit
> installed inside. The sparky will sort this.
>
> I dont know anything about the Net I/O card but from what you say it
> seems to have a small internal relay. If so then, just as you say,
this
> is wired in series with a 12V supply (that you have to provide) to
your
> relay - although conventionally most people switch the + rather than
> the - side...If you can send me the manual by email I'll take a read
> over it for you...
>
> cheers Kevin
>
> You need Marc Fuller wrote:
>  >
>  > Hey guys,
>  >
>  > I'm after some help with wiring up the NET I/O card with some
lighting.
>  >
>  > Specifically I am having problems locating a suitable relay. I
am trying
>  > to control some perimeter lighting. I'm not totally sure of the
>  > voltage/amps yet but let's assume the lights are running at 240v
and
>  > 16amps.
>  >
>  > So, I don't want to put that load through the NET I/O card so I
will
>  > need a relay. From what I've read on the NET I/O card it can
switch up
>  > to 12vdc up to 1amp or 125vac up to .3amp. Is that correct ? or
does is
>  > specifically need to be 12v 1am or 125v .3 amp ?
>  >
>  > So let's use 12vdc as an example. So I need a relay that when I
supply
>  > 12vdc, it switches the 240v contacts. I think this also means I
need a
>  > SPST relay. Correct ?
>  >
>  > So how do I wire that into the NET I/O card ? Do I need a 12vdc
power
>  > supply that I then feed into the NET I/O card which will then
pass that
>  > voltage on ? e.g the 12vdc positive goes straight to the relay,
then the
>  > 12vdc negative goes to either the GROUND or OUTPUT PIN1 of the
NET I/O
>  > card. If I put the 12vdc negative to GROUND, then OUTPUT PIN1
goes to
>  > the negative coil contact on the relay. Thus when the NET I/O
card
>  > activates the output, the 12vdc negative goes from GROUND to
PIN1 and
>  > thus activates the relay.
>  >
>  > Phew.. that's a lot to take in for a non-sparky like myself. Is
this all
>  > correct ? If it is, does anyone know of suitable relays ?
>  >
>  > I must admit I'm a bit lost on all this. I will point out though
that I
>  > won't be wiring the relay myself, a sparky will be doing it but
he
>  > doesn't understand what I need from him, so I am trying to get
it
>  > straight in my head before I pass it on to him.
>  >
>  > Any help much appreciated
>  >
>  > Marc
>  >
>  >
>
>


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