marklin-users.net community | Forum
»
General topics
»
Digital
»
Control of train passing a signal in opposite direction
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
|
|
|
|
|
|
 Joined: 04/02/2011(UTC) Posts: 3,555 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 |
|
 1 user liked this useful post by JohnjeanB
|
|
|
|
 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
|
|
|
|
|
|
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
|
|
|
|
|
|
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
|
|
|
|
|
|
 Joined: 12/12/2005(UTC) Posts: 2,448 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
|
|
|
|
|
|
marklin-users.net community | Forum
»
General topics
»
Digital
»
Control of train passing a signal in opposite direction
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.
