RailPro > RailPro Specific Help & Discussion
Speaker Wiring
Stephen K:
Thanks for the resistor info Alan. Walked into Radio Shack and walked out a moment later with a 5-pack of resistors for $1.50. Such a deal. Got everything installed last night and dropped it onto my test track. BEAUTIFUL! I'm thrilled but with one big exception. Neither of the lights work. :( Everything else is fine but the lights, not so much. I fear I may have wired them to the wrong leads on the connectors.
Ring's wiring diagram for the LM3-S leaves a little bit to the imagination and I guess I imagined incorrectly. I did some internet searching and found a diagram of the proposed NMRA color coding. It seemed to agree with Ring's wiring diagram so I followed it. Used the white lead to the front light, yellow lead to rear light and blue common for both. All off the 9 pin connector, resistor on the white lead to the front LED. No lights.
Is there something I need to do with the controller to activate the lights? Or do I need to go back and rewire them differently?
nodcc4me:
If you are using LED's in both front and rear you would need a resistor on both hot wires. If you place the resistor in the blue wire I believe you can get away with just one.
Go into your settings and make sure you have the correct light files on the appropriate buttons. If not, you will have to either copy them from the controller to the module or download them to the HC and then copy them over.
Alan:
So that we have a common reference, here is LM schematic.
Does your wiring match?
What connections are you struggling with?
G8B4Life:
--- Quote from: nodcc4me on March 26, 2020, 09:53:13 AM ---If you place the resistor in the blue wire I believe you can get away with just one.
--- End quote ---
I would strongly advise against that. While it's possible to do because the resistor can indeed go on either the positive (blue wire) or the function ground wires (white, yellow, green or violet) if you put only one resistor on the blue wire instead of a resistor on each of the ground wires you would have to make sure you only used one output at a time; ever. Failure to do that would quickly result in the destruction of the resistor and the LED's being powered at the time, and possibly damage the LM too.
Alan could explain the "how and why" behind the destruction better if he'd like, I forget all the proper calculations to show it.
- Tim
nodcc4me:
I haven't done it, and I wasn't sure. Thanks for the correction, Tim.
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