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Fast Tracks :: View topic - Double Crossover wiring
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Double Crossover wiring
http://fast-tracks.net/forums/viewtopic.php?f=5&t=379		 Page 2 of 3
Author:  roadkill_97006 [ Wed Apr 18, 2007 10:48 am ]
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Author:  roadkill_97006 [ Fri Apr 27, 2007 1:42 pm ]
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Author:  rockisland [ Fri Jul 06, 2007 1:22 pm ]
Post subject:  Re: Double Crossover wiring - DCC
Author:  roadkill_97006 [ Fri Jul 06, 2007 7:48 pm ]
Post subject:  Re: Double Crossover wiring - DCC
Author:  rockisland [ Sat Jul 07, 2007 12:06 pm ]
Post subject:  Re: Double Crossover wiring - DCC
Author:  roadkill_97006 [ Sat Jul 07, 2007 1:27 pm ]
Post subject:  Re: Double Crossover wiring - DCC
Author:  Lew Wagar [ Wed Aug 15, 2007 3:43 pm ]
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Author:  roadkill_97006 [ Wed Aug 15, 2007 5:52 pm ]
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Author:  tetters [ Tue Mar 11, 2008 11:05 am ]
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Sorry ro resurrect an old thread gents. The DC wiring calls for a 12 volt really. I was wondering if this little guy would be sufficient?

http://www.thesourcecc.com/estore/Produ ... ct=2750249
Author:  emccamey [ Tue Mar 11, 2008 11:24 am ]
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Yes, the control of the relay is only 60ma, and the contacts can handle 5a - more than sufficient. Good find at a reasonable price. Do search around for a socket base and you have a nice easy to maintain system - but I wouldn't pay too much premium for a socket - soldering to the contacts would be OK with some care and the unit should last longer than your life.
Author:  tetters [ Wed Apr 16, 2008 9:59 am ]
Post subject: 
Bump.

I figured instead of starting a new thread I'd just post up my question on this one. It follows the same lines, just only half of a cross over in this case.

Here is what I'm dealing with.

Image

Sorry for the crappy MS Paint pic. The frogs are in black and I hope the gaps are clear enough. Green and Red are the colours that I chose for the track buss wiring. I am using Tortoise Machines to control the two t.o's. Am I correct in assuming that I should be able to use the secondary internal switch in the Tortoise to switch the polarity of the frogs on the crossing? Realistically, you'd only have one loco using the crossing at a time. So as long as ensure that both t.o's are wired so that the polarity is correct when they are thrown, then I should be good to go. Right?

I think I tend to over think this stuff too much.[/img]
Author:  emccamey [ Wed Apr 16, 2008 5:41 pm ]
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If you should ever throw both turnouts at the same time, you'll end up with a short. I'd suggest each turnout only control one crossing frog. In the non-crossing position the controlled frog would be set for the opposing turnout route such that with one turnout thrown, then it sets its' frog for crossing and the other frog stays at crossing (since it' set to straight).

This way, you'll not have a dead short and proper operation would only occur with one turnout thrown to the crossing. It's a bit of fail safe. I you have trouble visualizing the connections - let me know - I can colorize a two (or four) position graphic that could help.
Author:  tetters [ Wed Apr 16, 2008 8:44 pm ]
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Thanks. That was the idea. I just wanted to make sure it would work.
Author:  tetters [ Thu Apr 17, 2008 9:16 am ]
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I got it wired up and working last night Ed. Thanks for confirming my ideas as to how it needed to be done. Locos roll through fine now in both directions. And I like the "safety feature" if one the t.o.'s is left thrown in the wrong position.
Author:  emccamey [ Thu Apr 17, 2008 9:24 am ]
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Congratulations. It's not all that hard to reason out the wiring - especially when using colorized templates. Sometimes, like with a double crossover, the scheme does require asserting route selection and control to get it right.

With DCC, one can have the option of auto polarity changes electronically, but usually a simple fail safe method will be more robust.
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