Control of train passing a signal in opposite direction

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Control of train passing a signal in opposite direction - Reed switch 7555 & Relay 7244

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poppa-7		#1 Posted : 27 February 2013 22:54:57(UTC) Retweet
Joined: 10/07/2007(UTC) Posts: 93 Location: Palmerston North, New Zealand		Hi I once found a circuit diagram that shows how to allow a train to pass a signal in opposite direction using reed switches 7555 & relay 7244 but I can't find it again. Can any one help Thanks Russell


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JohnjeanB		#2 Posted : 03 March 2013 10:33:10(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,151 Location: Paris, France		Hi Russel I don't have a schematic for you but the principle is simple: When running in the opposite direction the train will set the relais to bring power to the isulated track section. So lets connect: - the green solenoid wire to the reed sensor behind the signal - the red solenoid wire to the reed sensor before the signal - the first inverter contact to track center stud - the "green" side of this first inverter to the insulated track section (so this track section is now controlled both by the signal and by the relay. What is does: when the train comes from behind the signal it "turns" the relay to green. The first inverter then makes sure that no matter what the signal position is, the train will continue. Of course , in the opposite direction, the relay wil be "red", leaving then the signal to drive the train. Sorry about the long text I hope it helps Cheers Jean WARNING: the above works for BOTH analog and for digital operation PROVIDED that there is no digital slow-down section
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Nielsenr		#3 Posted : 03 March 2013 22:45:50(UTC) Retweet
Joined: 06/10/2010(UTC) Posts: 883 Location: Fort Lauderdale, FL		Russell, I believe there is a circuit diagram for this in the Marklin HO Signal Book 03402. I can't find mine my book at the moment, I'll have to see if I can find it. Robert


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poppa-7		#4 Posted : 06 March 2013 01:51:32(UTC) Retweet
Joined: 10/07/2007(UTC) Posts: 93 Location: Palmerston North, New Zealand		Originally Posted by: Nielsenr Russell, I believe there is a circuit diagram for this in the Marklin HO Signal Book 03402. I can't find mine my book at the moment, I'll have to see if I can find it. Robert Hi Robert/ Jean. Thanks for that. I have got a signal book and I have seen that diagram in the 03402. However I should have been a bit clearer about the circuit diagram I saw. I am sure that it showed the relay connected to a K83 decoder, from there Im not sure. If I can't fine the diagram I may have to use the one in the 03402 Cheers Russell


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Nielsenr		#5 Posted : 06 March 2013 06:10:37(UTC) Retweet
Joined: 06/10/2010(UTC) Posts: 883 Location: Fort Lauderdale, FL		Russell, I found my book. Is there not a circuit on page 9-5 (Figure 9-14) that shows a K83 connected with a 7244 universal relay?? Robert


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clapcott		#6 Posted : 06 March 2013 09:18:14(UTC) Retweet
Joined: 12/12/2005(UTC) Posts: 2,436 Location: Wellington, New_Zealand		Hi Russell, The bit that concerns me is the reliance on reed switches as being "directionally" sensitive. Personally I would not go anywhere close to making that assumption. While the book states "You should therefore test to make sure the magnets are activating a reed switch before cementing the former into place on a locomotive or car" It dosn't emphasise that the reed switch need to be tested by all locos likely to travel in the opposite direction to ensure they do not (never) cause a trigger The phrase "Yeah Right" comes to mind I really would steer you to circuit tracks (directionally specific - but beware of Mr TwoShoes) or PC sequencing (which can selectively disable a sensor input from triggering) p.s. will we see you at Easter?
		Peter


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