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Sound Car

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ron045:
Can you help me understand a little further?  There would be no motor load on the 2nd board if in a box car?  Why would the lead engine's LM care about that?  The Ring video I saw on consisting made it look like both engines want to do the same speed.  If the Lead engine does not sense the 2nd engine is catching up or slowing down, would it just keep moving as directed?

Thanks!
Ron

Alan:
Two reasons.

First, without a motor load you cannot set stall current. When consisting, the LM is trying to balance the load between two motors and one of them has a stall current of zero.
Second, in operation the LM will continually try to lower the real motor current to raise the missing motor current thinking it is not pulling its share of the load.

I've never consisted to a LM with a stall setting of zero. Why don't you wire one up and let us know what happens. It would be interesting to know.

ron045:
OK... I just happened to have another LM-3S-G for my next Diesel project.  Here are the results.  It would be best if I could figure out how to automatically have the sounds stop when the train stops.  If that possible?
Ron

Alan:
Interesting how the train appears to functional normally even with a missing motor. Thanks for doing the test.

Alan:
HI Alan,

It will work.  The only thing you will need to remember is the sound module (without motor) can not be selected as the lead loco.  In fact it would be best to always link in the sound  module (without motor) last.   All the linked loco motor sounds are tied to the sounds of the lead loco sounds (non-sound lead loco is ok - non sound still sends sound reference for other sound modules to follow). The not connected motor will not make a difference as long as it is not selected as the lead loco.

Tim

Ring Engineering Inc.

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