Re: AutoReverse Modules

Marcus Ammann

Hi Paul

It depends on whether your sections of track that need voltage polarity
reversing, enter and exit by the same turnout or different turnouts.

For a section that enters and exits the same turnout, I call this a reverse
loop. For a section that enters and exits by DIFFERENT turnouts, I call this
a return loop.

Auto reversers are expensive, so for the "reverse loop" I use a DPST (double
pole single through) switch or a relay that is connected to the operating
throw bar of a turnout. The train enters the reverse loop and to exit the
reverse loop you will have to operate the turnout. This is normal. Operating
the turnout will also operate the switch/relay that will change the polarity
of the track voltage. The train will continue as if nothing happened.

So for a loop that is used for changing the direction of the train a switch
will achieve the same as an auto reverser.

The "return loop" is a different proposition due to the layout construction.
The return loop may be at the end of a yard where either the yard or the
return loop voltage polarity has to be reversed. This can only be done
automatically and easily by using an Auto reverser.

Turntables are another example where an auto reverser and not a switch must
be used.

More information can be obtained by reading Allan's "Wiring for DCC" at:


-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...] On
Behalf Of sawlumber2004
Sent: Friday, 23 December 2005 4:44 AM
To: WiringForDCC@...
Subject: [WiringForDCC] AutoReverse Modules

I'm thinking about purchasing a PM42 Digitrax because I have 4 sections
that need auto-reverse (or loops). I noticed that the PM42 can power
manage for 4 independent auto-reversing sections. I have an NCE DCC
system. I happened to look through the manual and I think I understand
how to wire it. Is there anything else I need to be aware of? I'm
thinking that the factory default settings will work with my system. I
sure hope so.

This is all new to me and at times very confusing. Do you have any
suggestions about how a beginner can learn all about this stuff?

Paul Weaver
Yahoo! Groups Links

No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.5/212 - Release Date: 12/23/2005

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.5/212 - Release Date: 12/23/2005

Join to automatically receive all group messages.