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Reply to "Conventional problems on new DCS/TMCC layout - TIU PROBLEM?"

So, at GRJ's suggestion, I checked track voltage on my two variable channels (connected to a single mainline in blocks). Although I set the DCS remote to 18-18.5V, actual track voltage was only at 15. I checked every track segment and all were the same (except 2 that I think I need to replace, but I digress), so 3-3.5V less than what I was requesting via the handheld.

I raised the voltage on the handheld to 20.5 and was able to achieve 17-17.5V actual track voltage. My first thought was that I must have a wiring problem; however, my track voltage matches perfectly to the TIU output terminals. No matter what I measure at the TIU variable channel output terminals, I get the same voltage around the entire mainline, so that tells me my wiring is good.

So, the first thing this electrical neophyte thinks is that this is normal OR, more likely, the problem is in the TIU, but on both variable channels???

Each LW transformer is pushing 18.6V into the TIU, no issue there.

Thoughts, suggestions?  Can I just set the DCS remote at 20-22V to get my needed 17-18V at the track or is that going to stress the TIU?

BTW, even when there's 17-17.5V on the track, the Alco AAs are struggling with the 5 lighted passenger cars, so I think I'm going to look for some LEDs and see if that solves that problem. Other suggestions?

Last edited by raising4daughters

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