Welcome to the forum   
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Share
Options
View
Go to last post in this topic Go to first unread post in this topic
Offline greytag  
#1 Posted : 21 February 2014 20:28:11(UTC)
greytag

Sweden   
Joined: 04/02/2013(UTC)
Posts: 24
Hi all,

I have made a prototype module for controlling signals. It depends on getting information on track occupancy and should be semi-automatic.
The module is running on 5v and what I would like to ask you is the following.

1. Do you know of any good beginner tutorials for the Contact Tracks (24995)?
At the moment I have a mobile station 2 and the connector box (I don't know the name, sorry) and, of course, some track and trains.

2. Do you know of any good way of making the Contact Track (~12-17 VAC) interact with my module (5 VDC)?

I have tried searching, but I can't really find anything for beginners.

Thank you for any help.
Offline Webmaster  
#2 Posted : 21 February 2014 21:35:52(UTC)
Webmaster


Joined: 25/07/2001(UTC)
Posts: 11,094
The 24995 Contact track set is a "constant" track, indicating occupancy by the wheels shortening the 2 outer rails between the 2 tracks.
This means that as long there is a Märklin wheelset on the track, it will be "shorted" - ie grounded towards the transformer brown.
Great for occupancy detection and such, ie if there is a train or a part of it occupying the section. The typical applications of this track
is to control a railroad crossing passing, or to see if a track is occupied - like a track in a station area or such.

There is also the momentary contact track 24994 with momentary grounding towards transformer brown, usually used for momentary
actions as switching a signal, turnout, relay or such when a loco/wagon slider activates it.

The detection is made by the fact that the detection piece is shorted towards the brown "transformer ground" or not.
So, the external module should be able to detect a short towards transformer ground. The reference point for this kind of detection
must be that the external circuit has common ground with the brown track ground and can detect the short.


I don't know if this helps or confuses at a higher level, but at least it's a start for a discussion of the principles...
Juhan - "Webmaster", at your service...
He who asks a question is a fool for five minutes. He who does not ask a question remains a fool forever. [Old Chinese Proverb]
thanks 2 users liked this useful post by Webmaster
Offline greytag  
#3 Posted : 21 February 2014 22:16:07(UTC)
greytag

Sweden   
Joined: 04/02/2013(UTC)
Posts: 24
Thank you.

This is as far as I have got, but it's nice to have it included in the thread for future use.

I have the 29450 and an old analogue controller (6647 maybe). Could I just use these together?
Offline greytag  
#4 Posted : 23 February 2014 22:37:56(UTC)
greytag

Sweden   
Joined: 04/02/2013(UTC)
Posts: 24
I managed to connect the contact tracks to my signal module through a relay.

Now I just need to build a bunch of modules, signals and get some contact tracks to perform a large scale proof of concept. Also, I need to work out how to do turnouts. :P
Users browsing this topic
OceanSpiders 2.0
Similar Topics
Contact track (Model railroad wiring)
by Marklinisten 09/04/2021 11:03:02(UTC)
Contact Tracks for K track (H0-scale)
by Harvey 14/03/2021 01:34:22(UTC)
Contact Track with Märklin M-track (H0-scale)
by amartinezv 13/03/2021 09:57:37(UTC)
Contact Track, M-Track and S88 (Digital)
by Harvey 15/12/2020 01:19:00(UTC)
16 Contact tracks and I don't know what to do with them (Digital)
by oranda 18/08/2020 15:08:55(UTC)
CS3 contact track icon (Digital)
by QQQ1970 27/04/2020 01:03:23(UTC)
Dead spots on C contact tracks (General MRR)
by obb_taurus 12/01/2020 19:41:32(UTC)
M Track analogue contact track5146 (General MRR)
by David240945 10/01/2020 23:22:57(UTC)
Purpose and use of Contact Track 5115 (H0-scale)
by sharples 07/08/2019 03:44:38(UTC)
Contact Track with C Tracks and MS as moving (Digital)
by federicofreundt 16/03/2019 22:26:46(UTC)
Zener diode and contact track (Digital)
by phyan 19/02/2019 16:48:21(UTC)
contact track 5146 connected to two signals (Model railroad wiring)
by stockerta 14/10/2018 09:38:44(UTC)
Make your own Märklin C-track Contact Track (General MRR)
by Thewolf 06/03/2018 17:55:40(UTC)
How many solenoid devices can one contact track drive? (Model railroad wiring)
by asp1880 05/09/2017 20:01:05(UTC)
Märklin 24922 part of contact track/block (H0-scale)
by dennisb 21/10/2016 14:43:19(UTC)
Contact track length in shadow yard (Digital)
by pschloes 17/03/2016 00:11:15(UTC)
Placement of contact tracks with windigipet software (Model railroad software)
by marklin61 30/01/2016 23:28:11(UTC)
Circuit and contact tracks C purposes? (Digital)
by federicofreundt 17/10/2015 02:10:25(UTC)
Modules for K track contact tracks (Digital)
by PeFu 03/04/2015 20:52:06(UTC)
Contact Tracks - Question (H0-scale)
by SteamNut 16/12/2014 17:26:46(UTC)
CS2 doesn't show signal from contact track (Digital)
by BrianM 27/08/2014 21:00:26(UTC)
how to use track blocks and contact tracks (Digital)
by Laxman 20/02/2014 07:22:59(UTC)
Automatic Station with Contact Tracks (Track plans)
by Laxman 11/02/2014 01:03:02(UTC)
Contact Track, Switching Track or Reed Switch (Digital)
by PMPeter 09/11/2013 22:38:45(UTC)
Basic Contact track wiring question (Model railroad wiring)
by Mike M 27/08/2013 18:09:26(UTC)
Marklin Switch Track and Marklin Contact Track (Model railroad wiring)
by kumarvartak 16/06/2013 10:50:58(UTC)
C-Track "blocks" / contact tracks (Digital)
by pmgsr 13/02/2013 23:46:12(UTC)
hints for using circuit track 24994 and contact track 24995 (Digital)
by sikardon 11/08/2012 16:08:35(UTC)
Contact tracks, S88, Memory on CS2 (Digital)
by fhp2 29/02/2012 22:11:33(UTC)
Nielsenr - Contact tracks in Braking Area (Digital)
by Nielsenr 30/08/2011 05:37:02(UTC)
C-Track switching contact track 24994 (H0-scale)
by river6109 04/05/2011 11:17:59(UTC)
DIY (homemade) Contact Track (H0-scale)
by JD 30/11/2009 19:32:24(UTC)
Contact track sensing (Digital)
by perz 22/02/2009 19:21:00(UTC)
Contact tracks problem/questions (Digital)
by WelshMatt 29/01/2009 12:48:53(UTC)
Marklin Metal Contact Track Section (H0-scale)
by aos 28/12/2008 22:16:13(UTC)
Why don't you have problems with contact track? (H0-scale)
by efel 29/07/2008 18:45:59(UTC)
Homemade contact tracks: M and C? (H0-scale)
by mascagni 15/10/2007 16:27:19(UTC)
contact track vs reed relays (Digital)
by 2ndChancer 01/07/2007 04:53:51(UTC)
Contact track length (Digital)
by 2ndChancer 02/05/2007 14:44:33(UTC)
Contact track and traction tires (Digital)
by laalves 07/11/2006 00:49:04(UTC)
contact tracks (Digital)
by Xav 17/10/2004 16:02:44(UTC)
DIY Contact Tracks (General MRR)
by Dick 29/02/2004 21:36:00(UTC)
M Track Contact Tracks (Digital)
by xxup 29/01/2004 23:45:33(UTC)
Old contact tracks (H0-scale)
by coloradopatton 14/03/2003 00:33:41(UTC)
C-Track : how to make a long "contact track"? (Digital)
by Thalys 22/01/2003 22:15:47(UTC)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

| Powered by YAF.NET | YAF.NET © 2003-2021, Yet Another Forum.NET
This page was generated in 0.360 seconds.