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Posted by John Mycroft on October 6, 2005, 10:14 am
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Thanks DR & Dean
I like the idea of the double pole switch and it's nice to know about the
built in overload protection. My concern about short circuits etc is that
the trains will be run by my 6 year old son and it is not beond the realms
of probability that, with 2 loops connected by a siding, he could have one
controller wired up so that turning it counterclockwise means the train goes
forward and have the other one connecte the other way round (should have
called the kid "Murphy" :>} )
T'other option is to have the two loops cross each other with 2 cross tracks
but not be connected at all. So long as we don't burn the house down...
--
Cheers - John Mycroft
coryton_at_cobbsmill_dot_com
> well...in that case I would say to use a transformer that has overload
> shutdown feature built into it.
>
> MRC Tech series controllers come to mind but there may be other names that
> I don't know of too.
>
> or for the best I would say to gap the connecting siding into its own
> 'third' block and hotwire up a doublepole switch to it to both track
> circuits.
>
> the way that could work is say we have two oval and one long crossover
> track that connects both...throw the switch to #1 and a train from outside
> circle enters the crossover block...stop it there...flip the switch to #2
> and the train is immedately on insidle circle power instead as it exists
> the block onto inside circle itself.
> --hope that made sense?
>
> John Mycroft wrote:
>> Hi
>>
>> We're about to add a second 9V train to the family and that raises the
>> question of power. I know you can run them both on the same track at the
>> same time if you're happy with them going together. We're thinking of
>> having two separate tracks with a connecting siding between them in which
>> we'll cut an isolating break. But the question is, if we make a mistake
>> and hook things up so that both power supplies get connected to the same
>> piece of track, what damage protection is there in the power supply or
>> motor to prevent anything nasty happening?
>
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> shutdown feature built into it.
>
> MRC Tech series controllers come to mind but there may be other names that
> I don't know of too.
>
> or for the best I would say to gap the connecting siding into its own
> 'third' block and hotwire up a doublepole switch to it to both track
> circuits.
>
> the way that could work is say we have two oval and one long crossover
> track that connects both...throw the switch to #1 and a train from outside
> circle enters the crossover block...stop it there...flip the switch to #2
> and the train is immedately on insidle circle power instead as it exists
> the block onto inside circle itself.
> --hope that made sense?
>
> John Mycroft wrote: