Turntable wiring with MRC auto reverse module

Model Railroader Electronics and DCC
1

Howdy.

I think I’ve read somewhere that a reverse module can be used for turntable operation. If this true would I use the track entering the turntable as the main and then wire the TT as the revesing section?

And, would I then wire the roundhouse as if it were the main?

Thanks for any input, scookam

2

Any roundhouse stalls that are directly across from a feeder track should have the same “polarity”. However, if it is a orphan stall, it doesnt matter if the table has a reversing unit.

David B

3

Thanks for the reply David B.

Not sure what orphan stall means but the roundhouse is directly across so I would keep that the same polarity. I get that part but I thought that if I rotate my loco it would need to be reversed because it was now going the other way. No?

Thanks again, scookam

4

sckookam, you understand it correctly. If the approach track and the roundhouse stall tracks are wired the same way (matched polarity), then the turntable should be wired to the auto-reverse unit to detect and correct any reverse polarity issue.

Rich

5

What brand and model of turntable is it? Many of them do not need an auto-reverser, as they were designed with mechanical “split rings” to control the polarity.

6

It’s a Walthers 120’ manual.

7

Are you sure about that? I thought that Walthers only made a manual 90’ turntable, a 90’ indexed turntable and a 130’ indexed turntable?

Rich

8

Rich.

Yes. It says on the box 120’ Walthers. N scale. And it’s all I could find. Got it from Walthers. Not very impressed either. I really wanted a 90’ but could not find one.

9

Ahhh, N scale. Well, I’ll be darned. Didn’t realize that Walthers made a 120’ turntable.

Back to the wiring. I have to believe that there is no split ring on this little sucker so you will need to deal with the reverse polarity issue.

Rich

10

The N Scale turntable needs an autoreverser. There is no split ring. The autoreverser should supply the bridge track. IIRC, the red wires connect to the main line. Yellow wires to the bridge.

Martin Myers

11

This is what I thought. Thank you for the help folks.

scookam