Reverse loops

Re: Reverse loops

Postby krokodil » Tue Jan 30, 2018 9:01 am

Partially yes. The difference is, that you do not have to care about the ride direction, the locomotive will move always for eg with boiler in front. The only problem is that in the loops - while the train is there - you have to change the track polarity ( swap them) ie when the train leaves the loop the wheels do not create a short cut.
Ie it is different from the analog world, where you have to change the polarity on the tracks outside of the loops.
In your design you need to care about the track polarity only in the two loops, the rest does not matter. ( the polarity can be maintained on the simplest way with the two switches RLmodule.)
Last edited by krokodil on Tue Jan 30, 2018 11:23 am, edited 1 time in total.
Greetings from Austria
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Re: Reverse loops

Postby CFRiad » Tue Jan 30, 2018 9:21 am

Hi Surovi,

Don't get discouraged as it is simpler than it seems. Doing it with DCC is actually even simpler than with DC. Here is what you need for a setup that drives your layout as shown in the plan (awesome idea for a layout, by the way) using DCC:

To make everything work you need to do two things:

1. Implement the polarity reversing system.
For this you need to insert insulating joiners on both rails at both ends of the loop, right after the turnout. Wire the auto-reversing modules according to the diagram below and you are done.
dcc_revloop.png


2. Implement turnout control
Install two train-activated contacts in each loop, set back from the turnouts, giving the turnout motor time to move the points completely before the train gets to them. The wiring will depend on the type of turnout motor. If it helps you, I can sketch a wiring diagram for the MP motors.

And now the limitations:
  • The length of the trains through the loops is limited by the distance between the train- activated control switches.
  • The speed of the trains is limited by the time the turnout needs to completely switch over from the moment the first wheel activates the switch.
  • The directions the trains travel thought the loop will alternate: first time the train enters the loop the turnout will be, say, in through position and will exit with the turnout in diverging position. The next train entering will find the turnout in diverging position and will exit in through position. If this limitation bothers you, it can be eliminated, but my intention was to keep things simple.

If you do it this way, you will have completely automated reversing loops. They will work over and over, without operator intervention.
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Re: Reverse loops

Postby Surovi » Tue Jan 30, 2018 2:36 pm

Thanks both!
:thumbup:
CFRaid, I`ll ask you for help at the end of March :grin:
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Re: Reverse loops

Postby krokodil » Tue Jan 30, 2018 3:37 pm

Surovi wrote:Thanks both!
:thumbup:
CFRaid, I`ll ask you for help at the end of March :grin:



Here are some links for DC system
http://tams-online.de/epages/642f1858-c39b-4b7d-af86-f6a1feaca0e4.sf/de_DE/?ObjectPath=/Shops/642f1858-c39b-4b7d-af86-f6a1feaca0e4/Categories/%22Know%20How%22/Online-Infothek/Betriebsablaeufe_steuern/Kehrschleifensteuerung#Kehrschleife_analog
Or some animation
http://www.der-moba.de/index.php/Kehrschleife
And something in English

http://www.azatrax.com/model-railroad-reverse-loop.html

There are ready made control units for DC and DCC ( eg at conrad.de etc)

If you need any help, just let us known.
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Re: Reverse loops

Postby Surovi » Tue Jan 30, 2018 6:22 pm

Thanks!
:thumbup:
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