RailPro > RailPro Specific Help & Discussion

Keep Alive installation w/ Railpro

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William Brillinger:

--- Quote ---I may have been hasty with my conclusion that the Bridge Rectifier was causing issues between locomotives.
I will do some testing this evening to confirm how my units are behaving.
--- End quote ---

It appears my issues with my units that still have LM-2S's are more related to a surging issue. This is an issue with the locomotive, not the RailPro module. It's one of my Athearn Genesis GP38-2W's that hit the floor a while back during an op session. It seemed like it was ok at the time, but there might be something broken in a gear tower.

William Brillinger:
Just to update this thread a bit...

Here is how I am installing KA's in my LM3 series units: https://rpug.pdc.ca/index.php/topic,383.msg2872.html#msg2872

Yes there is a possible issue with short protection, but this is what Tim Ring designed these inputs for.
If you are concerned about this, then use the Bridge Rectifier and put the KA's on the outside of the LM power inputs.

WARNINGS:

* This only applies to RailPro LM3 modules. Older Modules need a Bridge Rectifier to install a Keep Alive
* This will probably void your warranty from Ring Engineering.
Wire the Keep Alive as follows:

Module 9 Pin Blue (Common Wire) to KA3/4 Blue +12v Wire
Module 6 Pin Yellow (Negative Wire) to KA3/4 Black/White Ground Wire

nodcc4me:
Looks simple enough. It's great that we have some electronic whiz kids on here.  ;) Thanks Bill.

TwinStar:
Kevin's original diagrams showing the wiring schematic for an LM-2 are now missing from this thread. Are they stored somewhere else?

Thanks.

William Brillinger:
Ah yes, the photo bucket issue.

Here are my images for wiring an LM-2 with bridge rectifier:

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