Problem with UCS wiring

taylorraOGR Forum Member

I am installing a couple UCS tracks on new sidings. In the past, I have connected the controller using all four wires, and varying track power for fine control of the tracks. Now I would like to use fixed voltage to operate accessories independent of track voltage. I understand that replacing the second wire from the right from the controller with a fixed voltage wire from the transformer should do this. Doesn't work. Unless track power applied to center rail, no ucs function. Is there some sort of disconnect on the power terminal to cut off track voltage (similar to the fixed power connection on the O22 switch?)

3/11/135:44 PM

❤️ 0

Original Post

Replies sorted oldest to newest

win86OGR Forum Member

It has been about ten years, so forgive my memory. I certainly don't want to confuse or mislead you.

I seem to remember having this same problem. I think that the illustration of either the controller or the UCS as shown in the Greenburg etc. manuals have a view from the bottom when you expect it to be from the top. Or vice versa. Try flipping the entire left to right sequence and see if my memory still works.

The wiring scheme I use is as follows, the wire numbers indicating the wires coming from the controller: wire #1 to transformer common, wire #2 to screw #2 on UCS, wire #3 to transformer power, wire #4 to screw #4 on UCS. Remember that the sequence may be based on a view that is "flipped" upside down. Wired this way there are only two wires going to the UCS.

The UCS operates satisfactorily at 10v on my layout.

3/11/1310:01 PM

❤️ 0