RailPro > RailPro Specific Help & Discussion

Installing a “Keep Alive” or similar circuit

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G8B4Life:
The manual says should not, not must not. My guess is that's to prevent the PBM from being damaged by using it in a scale that would typically have higher power requirements, like 0 scale and larger. I don't know what the typical power requirements are for S scale but if your using the standard size LM's and not the G size then I can't see what the issue would be with using them. Logic dictates that if your using the designed-for-H0 LM's then you should be able to use the designed-for-H0 PBM's with them.

Obligatory however though, I'm not the manufacturer so what I've said is to be taken with careful consideration.


- Tim

Lackawanna810:
That makes sense. I’ll try the RPM in my engines.
Do I need to splice into decoder loom wires to connect the RPM?

G8B4Life:

--- Quote from: Lackawanna810 on February 16, 2025, 04:31:06 PM ---...Do I need to splice into decoder loom wires to connect the RPM?

--- End quote ---

No, depending. The LM-3 and LM-3S you just connect the PBM to the relevant wires on the 6 pin harness (solder wires together) . The LM-3S-21 the PBM will connect to the relevant traces on the mother board in the locomotive (solder wires to motherboard). The old LM-2 and LM -1 series are not designed for the PBM. Ring made a mention about a board to allow use with the LM-2 back when the PBM was released but nothing yet.

The LM and PBM manuals will cover all that you need to know.

- Tim
 

Lackawanna810:
Thank you Tim. I was wondering about the mentioned board for use with the LM-2.

You've cleared up a lot for me here, and I am grateful to you. Thanks so much.

ON28:
A bridge rectifier is needed to install a TCS keep-alive with the LM2. I posted about my install here with a Front Range geep, and someone else posted details of the circuit. It's not difficult. In '22 Ring told me the adaptor board is not available.

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