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INSULATED BREAKS


paul 27

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If you only have one controller you are unlikely to have a problem. Often when people have a 'double loop' they use two controllers, so when the crossover is in use arrangements need to be made to ensure that only one is connected. People often tend to take the simple view and just isolate between the points of a crossover and make other arrangements to ensure that the supply matches when the crossover is in use, rather than use power routing based on the setting of the points which makes operation simpler but is more complex to wire up.

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Just put one feed at the trailing side of the crossover with an insulated joiner after the feed, and the other feed at the leading side of the crossover on the other circuit - your Insulfrog points will then do the power routing for you.

 

You have to make sure that only one controller is connected in this way to prevent a short between the outputs of the controllers if one is set to forwards and the other set to reverse.

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Here is a diagram. I am not in any way condoning the use of dead frog points or DC, but this is how it can be done:-

 

post-7495-0-49688700-1353506643.gif

 

The isolating break is only required in one rail when using common return wiring, but will need to be in both if not using common return and there are other complexities to consider as well - common return will make life a lot easier. The Insulfrog points do all the power routing and isolation so there is no need for any other isolating joiners.

 

When only one crossover is in use trains will not be able to proceed beyond the isolator at the top, if you want to go further operate the other crossover as well or stop, close the crossover and use the other controller. The isolating joiner can be moved around that chord to make operation easier, but it has to be somewhere at least a train length from the points to allow a train to be clear of the crossover before the crossover is operated.

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