Ahh Digital Command Control (DCC), seems so simple, yet is so complicated when you peel back the layers. Between me blowing up decoders, and not knowing why something as simple as connecting 3 wires to the decoder to add an ESU Powerpack keep alive capacitor to a model didn’t work, I have a lot to learn.
Back at the turn of 2021, when I was busy blowing up a decoder install as discussed in the post linked above, I was also busy installing an ESU Powerpack keep alive capacitor in a Rapido Trains SW1200RS. I am reasonably confident in my trackwork, but have found that locomotives, especially short wheelbase ones are struggling at times to keep connectivity and they stall. The sound and lights in modern locomotives need good contact and power, something, despite my many efforts to look for areas causing loss of contact, cleaning track and wheels, applying graphite to improve connectivity, nothing was working. My Atlas Alco S2 7020, the first loco for the layout has a keep alive, and the couple of seconds it gives is enough to keep things running and keep me from losing my mind when operating. When I have run my other locomotives, their stalling has been making me want to tear the layout down and see how far an HO scale locomotive can fly when you hurl it. Neither of these are things that I actually want to have happen or do!!
So, for some time now I have been annoyed that it seems I did not manage to solder 3 wires to the decoder board in the SW1200RS, as it did not work. Yesterday, I made a trip to visit my friend Pierre Oliver, who I hired to do the remedial DCC install on the second Atlas S2 after I blew up the first one. When we were chatting, he pointed out when I mentioned my keep alive problems, that buried in the ESU instructions are CV values you have to change to activate the Powerpack. Well, damn, I missed those and hadn’t done that. So when I got home, I immediately tried, and it didn’t work, the decoder wouldn’t accept what I was trying to do. I looked at the manuals on the Rapido and ESU websites, and nothing was obvious that I was doing wrong. Some searching online it seemed that the Auxiliary Functions on older decoders were different, but what ones to change to activate it was the question.
This is where I have to say thanks, I think its important to acknowledge companies with good customer service, and my dealings with ESU have been fantastic. I sent an email to them this morning, and within a couple of hours, I had the information I needed back from them:
That is an older run locomotive with a Select decoder. On all of our Select decoders, Aux6 has to be disabled for the PowerPack to work. You can do this on the programmer by selecting Aux6 and the changing the output mode to “disabled”. To do it via CVs, please change the following CVs,
CV31 = 16, CV32 = 0
CV315 = 0
So, with their response in hand, I put the SW1200RS back on my programming track with the LokProgrammer, and pulled up the locomotive on the computer, within seconds, the changes were made.
Three quick steps in the ESU Lokprogrammer software. 1, go to the Function Outputs; 2 select Aux6; and 3, change to disabled. Then write to the decoder and test.
The video below shows the SW1200RS on the programming track, running away, then being tipped up on one side, and it keeps going for a couple of seconds before it cuts out, just like it is supposed to do with the Powerpack in an working. Now to take some time and run a train with it on the layout to see if the stalling out problems with this locomotive are resolved. If it is still stalling out, now I know its finding track problems instead of it being the locomotive.
There is something very satisfying about getting answers. Thanks to an off hand comment from Pierre about the programming of the locomotive he installed the decoder and Powerpack into for me, I realized something I had missed, which lead to the discovery of something that wasn’t clearly explained in the manuals, which lead to me asking for help from the manufacturer. They replied, and at the end of the day, in a bit over 24 hours I have apparently gone from one locomotive on my layout that runs reliably, to three!!