07-12-2009, 05:01 PM
ezdays Wrote:Lynn,
I would suggest you use a throwover switch. Take your main feeder to the rails and switch between power packs. I wouldn't put two power packs in parallel the way you want to. The one with the lowest voltage (even set to zero) would try to suck power from the higher one. If you need a wiring diagram, just ask.
An even more important reason to always isolate power packs from each other is the potential for one pack to blow out the power transistor of the other pack. At least that is what the retired electronics engineer in our club warned us about before we went over to wireless dcc, and traded that potential problem for some fresh problems. We did improve operation tremendously however! The change was definitely worth the new problems.