Adding new TIU

David,

The TIU numbers aren't causing a power problem. As long as the remote has TIU #1 and TIU #3 in it, control will be unaffected.

When you connected the TIUs to the layout after the upgrade to DCS 6.0, you may have crossed a pair of output channel wires. This would put Common into the center rail and Hot into the outside rails. That would cause a short circuit when the train bridges the tracks between the two TIUs.

Barry,

The plugs on the output wires are labeled red and black so they are in the correct locations. Fixed 1 controls the right side of the main loop and fixed 2 controls the right side of the inside loop. Could a red or black wire from the output side of fixed 1 and 2 be crossed?

David

David,

Could a red or black wire from the output side of fixed 1 and 2 be crossed?

I don't understand your question. Please be more specific.

Barry,

What I was thinking a red wire from fixed 1 going to the terminal strip for fixed 2. But I ruled that out  because the inside loop runs just fine. Trains run the entire loop thru both TIU's  There are no engines or cars on the right outside loop but when I roll a car from the left side of the outside loop TIU 1 and it bridges the gap to TIU 2 it shorts out.

David

Da vid,

You have a wiring problem. Somewhere there's an inconsistency between how the loops are wired.

I think your 180s may be out of phase if you're positive there are no crossed wires... here's an easy test.... measure the voltage on each side of the insulated joint separating  the 180s.... measure center rail to center rail. There should be little or no voltage . if the voltage is high , around 38 volts the 180 are out of phase

how's the voltage???   you  could  use a light bulb with a couple of wire leads.... If the bulb is  dim the 180s are fine, if really bright you have a problem...

 PS.Don't forget to put both tiu in super (that's not the shorting problem) got  to get that fixed first.

I found the problem. It was a older 180 that was wired wrong at the factory. So the 180's were out of phase. Corrected the problem and everything is working great.

Thanks for all the help.

David