Help for a beginner - short circuit

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CJH
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Help for a beginner - short circuit

Postby CJH » Fri Oct 18, 2019 4:42 pm

Firstly, apologies for the appalling diagram showing the proposed track layout.

Secondly sorry if this is a stupid question...
My question is how to wire up the points/track circled to prevent a short circuit from the return loop on the DCC layout?

Many thanks
Mod Note: Posts moved to DCC area as more replies are likely here.
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4DC37898-5AAC-4ED9-9EE0-510FC6711D36.jpeg

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Dave
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Re: Help for a beginner - short circuit

Postby Dave » Fri Oct 18, 2019 5:53 pm

In simple terms the tracks in the centre of the points need a break in them. The normal way to achieve this is with the use of insulated rail joiners.

RFS
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Re: Help for a beginner - short circuit

Postby RFS » Fri Oct 18, 2019 6:10 pm

Dave wrote:In simple terms the tracks in the centre of the points need a break in them. The normal way to achieve this is with the use of insulated rail joiners.


No this won't be enough. The layout is DCC so these turnouts positioned here constitute a reverse loop and hence some form of auto-reverser will be needed. However that does not look easy on such a short piece of track, so my question would be do you actually need this crossover here?
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Ironduke
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Re: Help for a beginner - short circuit

Postby Ironduke » Fri Oct 18, 2019 10:12 pm

The reverser can go on the loop on the right. It has to be long enough to hold a whole train unless your rolling stock has plastic wheels
If you have accessory switches on your point motors, and can be bothered working it out, you don't need an auto-reverser.
reverser.png
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Rob

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RAF96
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Re: Help for a beginner - short circuit

Postby RAF96 » Sat Oct 19, 2019 9:33 am

There are two reverse loops, one at each side where a train can come back onto the same track from the other direction.
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Flashbang
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Re: Help for a beginner - short circuit

Postby Flashbang » Sun Oct 20, 2019 9:10 pm

Simplest... Is I suggest you remove the cross over points circled. That would remove the reverse loops. It needs far more than insulated breaks in the cross-over points rails though!
If you really need to keep the cross-over points, then you need to totally isolate the reverse loops rails from the rest of the tracks and feed each isolated rail via a Reverse Loop Module or other means of flipping the loops rail power.
Note: A reverse loop is between the loops entrance IRJs and exit IRJs and should be longer in length than the longest complete train to travel over that loop.... A "Train" being the loco and all carriages or wagons. (IRJs are Insulated Rail Joiners)
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Ironduke
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Re: Help for a beginner - short circuit

Postby Ironduke » Sun Oct 20, 2019 10:00 pm

I can see why you'd want it there, so your train isn't always chasing its tail in the same direction. But you can only do it once; to reverse the train again you'd have to back it up through the crossover.

Anyway I've redrawn my picture with a simple reversing module.
Image
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Rob

CJH
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Re: Help for a beginner - short circuit

Postby CJH » Sat Nov 02, 2019 10:57 pm

Thank you all for you helpful replies and advice.


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