#### Wiring Walthers/Shin 3-Way Switch for DCC

Dave <dklproductions@...>

To all,

I am trying to wire a new DCC friendly Walthers/Shin 3-WAY turnout,
and need some help! I am trying to figure out how to connect the 3
seperate frogs so they are properly powered depending on how the throw
rails are aligned. I have not purchased any type of switch machine
yet, as I do not know what type would be best for this situation. I
was able to solder leads onto the 3 frogs to drop down under the
table, as well as solder jumpers from the closure rails to throw
rails. But how do I make sure the frogs will be powered correctly??

Thanks,
DAVE

Dave,

I'd like to answer your question, but I haven't seen one of these
turnouts yet. Even if I had, it would be hard to describe in words.
I'll try to see one at my local hobby shop the next time I go and I'll
make a drawing. Don't hold your breath waiting for the drawing. I'm
working full time and going to school at night. My weekends are taken
up studying. The drawing won't likely appear in my web page until the
end of the semester.

In the interim, I suggest the following: Draw out the turnout. Make
3 drawings; one each for the 3 routes the train can take. Label the
stock rails + and - and follow it through the turnout. By noting
which set of points was moved to change the polarity of the rails, you
will know which frog needs to be controlled by which set of points.

Allan

Dave <dklproductions@...>

The switch itself is properly wired, and I even added the jumper
wires for the point rails like you suggested. And I understand which
polarity needs to power the frogs per postion of the two sets of
points. The real question I have is control. How do I control the 3
seperate frogs to provide the correct polarity for the 4 possible
track positions?

I saw the section on setting up a micro switch/piano wire for a
single frog. Is there a particular switch machine or circuit board I
could build to deal with the various "if" scenarios associated with
a 3-way turnout??

Thanks again!

DAVE

--- In WiringForDCC@..., "wirefordcc"

Dave,

I'd like to answer your question, but I haven't seen one of these
turnouts yet. Even if I had, it would be hard to describe in
words.
I'll try to see one at my local hobby shop the next time I go and
I'll
make a drawing. Don't hold your breath waiting for the drawing.
I'm
working full time and going to school at night. My weekends are
taken
up studying. The drawing won't likely appear in my web page until
the
end of the semester.

In the interim, I suggest the following: Draw out the turnout.
Make
3 drawings; one each for the 3 routes the train can take. Label
the
stock rails + and - and follow it through the turnout. By noting
which set of points was moved to change the polarity of the rails,
you
will know which frog needs to be controlled by which set of points.

Allan

Dave,

It is difficult to describe how to hook up the 3-way turnout in
words. I'm going to make a drawing and add it to my website, but I
may not have time to do so until my Christmas break. Here it is in
a few words. I hope you can follow it.

Use two of your favorite switchmachine to operate the two sets of
points. Any switchmachine will do. Just be sure they each have at
least 1 set of contacts for power routing frogs. Tortoises and the
NJ International twin-coil type both have at least 2 sets of such
contacts.

Starting at the heel of the turnout, call the first set of
points "A" and the second set "B". Then call the first frog you
encounter "1", then "2" and then finally "3."

Electrically tie frogs 1 and 2 together. Why they didn't do this
has me wondering if I have made a mistake in telling you to tie them
together. So I checked my work and it seems right.

Frogs 1 and 2 are controlled by the power routing contacts of the
switchmachine you use to control the A points. Frog 3 is controlled
by the power routing contacts you use to control the B points.

See one of the turnouts on my website for how to hook up power

Note that I have not specifically told you which bus the power
routing contacts are to be hooked to. That's because unless you are
extremely careful, you will hook them up wrong. So why fight
Murphy? Just hook them up one way and try running a loco across the
turnout. If it shorts, swap the wires going to the power routing
contacts and try again.

I'll post on this forum when I get time to make a drawing and add it
to my website.

Allan