Atlas switch track and MTH AIU

Shoot me an e-mail at gjhouser@aol.com and I'll send you a diagram.....Greg

Hi Gregg,

I did get this working however; in your experience have you ever found with atlas's

switch track that the center screw was no the 'hot' connection?

I have basically so far in connecting to the AIU, that the motors do no trip, however when connected to a different SW that switch track works. All of my trouble shooting seems to imply that the motors are bad out of the box. I understand that replacing the motors is not difficult.

Thanks

Wiring diagram from the Atlas website.  Click on the underlined phrase.

Atlas twin coil switch machines have always had the center contact as "ground/common" --- I never wired them that way. I always had the center connection as "hot", so my wiring is reversed from the Atlas way. I did this because I use a Capacitive discharge circuit that puts the "hot" DC volts on the common connection of the twin coils.

Mike,

Correct, all of the working SW tracks are using the center as hot.

I my case, I am using AN mth terminal block which the hot goes to, the common

of the TB goes to the IN on the AIU, then the first and third positions on the SW are going to 1 and 2 on the AIU.