broadbent Posted September 14, 2017 Share Posted September 14, 2017 I have DCC and I also have motorised points with built in polarity switching. I would like to make a section of rail just before the frog to become dead if the point is set against the other way. I presume I could use power to the frog and check which side the power is and use some sort of relay to switch on or off power. What is the easiest/cheapest way of doing this please? Thanks Link to post Share on other sites More sharing options...
broadbent Posted September 14, 2017 Author Share Posted September 14, 2017 Thanks for such a quick response, but I don't really understand the diagram. I can see the polarity switch on the point - dark green (?) and that is switched by the point motor. But I don't see how the dark blue section is switched? Sorry for being so slow. Link to post Share on other sites More sharing options...
John ks Posted September 14, 2017 Share Posted September 14, 2017 (edited) Dutch master I hope you dont mind me recycling your drawing, if you see any flaws in my rehash then please let me know I have shown the point in each position & I hope this will make it a bit easier for Broadbent I have changed the colours to show the polarity of each wire & the rail it is connected to & removed all wiring & insulated rail joints that aren't necessary The rails beyond the insulated sections will need feeds The rail shown in green has no power connected to it Both switches are part of the Tortoise John Edit Thanks Dagworth for the Craftsmanship/Clever But the credit for the drawing should go to Dutch Master, all I did was colour in his drawing. Edited September 16, 2017 by John ks Link to post Share on other sites More sharing options...
broadbent Posted September 15, 2017 Author Share Posted September 15, 2017 (edited) So the second switch, if it is to be automatic will be a separate micro-switch operated by the point? Edited September 15, 2017 by broadbent Link to post Share on other sites More sharing options...
John ks Posted September 15, 2017 Share Posted September 15, 2017 So the second switch, if it is to be automatic will be a separate micro-switch operated by the point? Basically Yes If you use Tortoise Slow-motion point motors then they already have the 2 sets on C/O contacts(switches), other makes of slow-motion point motors may or may not have the 2 internal switches If you are using Peco or similar point motors then the micro SW(as well as the accessory switch) will be necessary unless you can mount 2 accessory switches on one point motor( I believe Peco may make an accessory switch that is a DPDT micro Switch John Link to post Share on other sites More sharing options...
broadbent Posted September 16, 2017 Author Share Posted September 16, 2017 Thanks to all Link to post Share on other sites More sharing options...
RMweb Gold RFS Posted September 16, 2017 RMweb Gold Share Posted September 16, 2017 Bear in mind this method will only work if all your trains are configured with a single loco at the front of the train. DMUs and EMUs, for example, may have the motor coach at the rear, likewise with any push-pull trains. Plus with a double-headed train the first loco will stop but the second will try to keep going (= lots of wheel spin!). Link to post Share on other sites More sharing options...
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