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There has been much discussion about the Ross double Cross Over and how to control it. I settled on using the one relay scenario to control the hot rails around the diamond. That coupled with two toggles to each throw the two diagonal facing switches. We also used the resistor arrangement to keep the RCS diodes lit on the switch machines and indicators on the control panel.

This arrangement requires that you always move the toggle to the straight position before moving to the turnout position. This action ensures that the relay is in sequence with the switch machines.

 

My friend called the other night to tell me that the relay burned out again. He swore that he followed the left (straight) before right (turnout) procedure.

 

Previous discussions included some comments that you can use 4 relays to allow 1 train to continually crossover and back on alternate trips around the two loops.

 

Will this configuration eliminate the burnouts? Could someone provide a functional schematic?

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 When you line the crossover for the diverging routes do both diverging routes throw at once?  This is where I always got into trouble.  You could get the relay to supply the power to the borrowed rail but it only worked one way, The other crossover route  was a dead short. I think I ended up creating routes were only one crossover could be lined at a time. Dale will get you fixed up.

Originally Posted by Gregg:

 When you line the crossover for the diverging routes do both diverging routes throw at once?  This is where I always got into trouble.  You could get the relay to supply the power to the borrowed rail but it only worked one way, The other crossover route  was a dead short. I think I ended up creating routes were only one crossover could be lined at a time. Dale will get you fixed up.

Greg,

They are wired per spec with two toggles.

 

1     2

   X

2     1

 

Bob

 

I was unfamiliar with the switched so I looked it up on the net. Here are 2 google pics.Click on any pic to enlarge.

 

 

ross 1

ross 2

 

The problem I assume is the relay failing to switch the rail power and pickup rollers shorting out paired 1 and/or paired 2 rails burning out the relay contacts. Here is a possible solution using 2, 24VAC relays DPDT 10 amp or more and a 4 position slide switch. You could also use a 3 position one but I have a 4 position one in my parts bin so i drew it that way. If you are unfamiliar with this switch it makes adjacent contacts as it slides. In the diagram,the "B" route would be with the switch slid to the bottom.The "A" route with the switch slid to the top. The straight route would be in the middle positions.  It is more complicated but you could also use 3 push buttons. I drew it for a PWZW but you could use most any transformer.

 

 

ross 4 slide switch

 

 Keep in mind I do not have this crossover so I can not test the circuit. I do throw my Ross tinplate switches with DZ1000 machines in a similar manner with relay contacts on an automated passing siding.

 

LINK

 

Also shown is an optional indicator LED for the straight position. Similar indicator lights can be tapped off the relay coils as route A or route B indicators. The relays effectively switch the center 1 and 1 or 2 and 2  with the direction of the switch routes. The circuit assumes the machines are thrown but does not verify it as the Ross DZ1008 relay would. However if the switch machines are working properly this should not be a problem.The slide switch selects one or the other (not both) or no relay coil.  The relay contacts configure the power distribution.

 

Since the relays used in this diagram are 10 amps or more,the transformer circuit breaker would protect the contacts even if it were shorted,which should not happen with this circuit.

 

 

ross 3

 

Feel free to Email me with questions if interested in this circuit.

 

Dale

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Images (4)
  • ross 1
  • ross 2
  • ross 4 slide switch
  • ross 3
Last edited by Dale H

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