FUZZY49

HI…

I would like to get EXACT INSTRUCTIONS on how to wire up an (old) INSULFROG -ATLAS Snap Switch/Turnout to my DCC system using a COBALT Switch Machine.

I seem to have a bit of confusion as to where I should solder wires to the Frog or whatever to make it switch polarity.

If this is even possible. Please help if you can. I've seen lots of videos on switches but none on the Atlas.

Fuzzy49

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m.bryan
An insulfrog point is exactly that - insulated.
It does not require any wiring to it.

If you are fitting the turnout with a Cobalt motor, you will need to remove the snap-action equipment and connect the Cobalt motor to the tiebar.


Mick
DCCConcepts Tech/Customer support
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FUZZY49
m.bryan...Hi & thanks for the answer.
BUT... don't I have to set up the FROG if I am making a LOOP so the polarity changes when the engine enters and exits the LOOP?
fuzzy49
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Julian
FUZZY49 wrote:
m.bryan...Hi & thanks for the answer.
BUT... don't I have to set up the FROG if I am making a LOOP so the polarity changes when the engine enters and exits the LOOP?
fuzzy49

There are two parts to the answer to your question...

1. You can ignore the Frog.  You said the Frog is "Insul-frog", which means it is insulated and can carry no electric current.  You can simply ignore it.

2. If you are constructing a loop, then the left hand rail on the rails before entering the loop, will have a polarity [say positive, for example].  The right hand approaching rail will be the opposite polarity [so negative, in our example].
Now let's follow the left hand rail from where you enter the points and turn left into the loop.  As you go round the left turn the left hand rail is on the outside of the loop and that rail is still positive all the way round.  As that rail gets back to the points that left rail is still on the outside where it joins the other direction of the points.  That outside rail now connects to the other approach rail - which sadly was negative and so the opposite polarity [positive facing negative].  It is easiest to see if you draw a loop with the two rails going round and meeting up again, one red and one black.

You will need a switch to swap the polarity of the rails inside the loop, before the loco passes back through the points again, to join the original approach rails.  It can be manual, Double Pole Double Throw, or an electronic one which will do it automatically, too.  There are lots of devices which are on the market to swap the polarity,  DCC Concepts certainly have one and clear explanations of how to connect the wiring.  It's quite straightforward, but best seen on their instructions, as their diagrams are much better than yards of words here.

Julian
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m.bryan
FUZZY49 wrote:
m.bryan...Hi & thanks for the answer.
BUT... don't I have to set up the FROG if I am making a LOOP so the polarity changes when the engine enters and exits the LOOP?
fuzzy49


Hi Fuzzy,
Your original post did not mention that you are using a loop.
As Julian says, you will require a method of changing the polarity of the rails around the loop and his suggestions are correct.
Mick
DCCConcepts Tech/Customer support
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