Re: LD11 - Can it be altered to operate using 12v dc or 24v dc

["big_red_748" <john.macnamara@xxxxxxxxxxxxxxxxxx>]

Thanks Ian, will your solution pass the signal to dim the lights?

I think I understand what you are trying to say re the opto isolater.
This is to stop mains voltage frying the CAT5E and light switch.  Is
that correct?

On top of all that equipment you listed, I would also have to buy the
LD11's.

I thought, if the LD11 internally converted the 240v ac input to 12
or 24v dc then it would be possible to bypass the 240v ac input and
connect directly the 12 or 24v dc with the CAT5E!

Cheers,


John



--- In ukha_d@xxxxxxx, ian.bird@c... wrote:
>
> I hear what you say (practising my corporate speak ;-)) but tbh the
price
> of the relays will be small. I don't have my price lists here but
you
> should be able to get the relays for a quid or so each.
>
> The next challenge is to mount them safely. As it happens my central
> heating switch thingy does just what you want. I take a 12 volt
signal
> which switches a relay which in turn carries mains voltages. Whilst
I would
> not recommend you to use the exact design the addition of an opto
isolator
> (no mains down the Cat5 cable) would not be a big deal. You can
even get
> professional printed circuit boards made for around 30 quid for 4
> (depending on size you may get more).
>
> So, relay and socket, opto isolator and socket, some connectors for
the
> various wires and a box to put it/them in. You should be able to
see that
> for a reasonable cost. Taking a worst case of around a tenner each
then 10
> circuits would only be a hundred quid + some time and effort.
>
> If you are interested then I would be happy to help with the PCB as
not
> everyone has the software (or inclination) for that. Having said
that
> www.olimex.com/pcb will accept files direct from Eagle
> http://www.cadsoft.de/ who do a
shareware version of their tool.
Just the
> time to learn it ;-(
>
> This would be a nice safe integrated solution where any failed
components
> could be replaced very easily.
>
> Ian
>
>
>
>
>


>                       "big_red_748"


>                       <john.macnamara@globalcr        To:
ukha_d@xxxxxxx

>                       ossing.com>                     cc:
(bcc: Ian
Bird/CV/Novartis)
>                                                       Subject:
[ukha_d] Re: LD11 - Can it be altered to operate using 12v dc or 24v
dc
>                       09/03/2005
02:27

>                       Please respond to
ukha_d

>


>


>
>
>
>
>
>
>
>
> Thanks Frank,
>
> The only problem is that buying a relay for every lighting circuit
> will add a fair whack to the cost.
>
> I want to keep the cost down as I am sure we all do.
>
> Cheers,
>
>
> John
>
>
>
> --- In ukha_d@xxxxxxx, "Frank Mc Alinden"
<fmcalind@b...>
> wrote:
> > Hi John
> >             I believe the ld11 button connections are at mains
> voltage
> > ...240v........
> >
> > What you could do is use the cat5 cable to operate small
industrial
> type 12v
> > dc relays back at Node 0 and connect the contacts of the relays
> across the
> > ld11 button connections....????
> >
> > HTH
> > Frank
> >
> > ----- Original Message -----
> > From: "big_red_748" <john.macnamara@g...>
> > To: <ukha_d@xxxxxxx>
> > Sent: Wednesday, March 09, 2005 5:17 AM
> > Subject: [ukha_d] LD11 - Can it be altered to operate using 12v
dc
> or 24v dc
> >
> >
> > >
> > >
> > >
> > >
> > > I am having an extension built and am taking the opportunity
to
> cable
> > > out for home automation.
> > >
> > > To keep costs down but allow for future upgrading, I was
planning
> to
> > > install a push button momentary switch at the light switch
and
> run 2
> > > x CAT5E cables (the extra one for future expansion) from
each
> light
> > > switch back to node 0.  Also to run each lighting zone back
to
> node 0.
> > >
> > > Using low voltage over the CAT5E to switch the dimmer on /
off
and
> > > also to dim.
> > >
> > > The problem is that the rail mounted LD11's operate at mains
> voltage
> > > so I either have to run a mains cable as well as the 2 x
CAT5E's,
> > > convert the LD11's to run on dc voltage or find another
solution!
> > >
> > > 1. Does the LD11 convert the mains voltage down to a lower
dc
> voltage
> > > internally?
> > >
> > > 2. If so, is it easy to remove this and therefore control
the
unit
> > > using 12v dc or 24v dc?
> > >
> > > 3. Am I missing an easier solution?
> > >
> > > Thanks,
> > >
> > >
> > > John
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
>
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links