All,

I need some help.  I am trying to power several TMCC components.  They are, in order from the Command Base:

ARC, BPC, AMC, 2nd AMC, TPC.

What confuses me is where the power connections go from one TMCC component to the next.  The diagrams below are inconsistent and confusing.  Here's what I mean.  Check out the ARC diagram (the area inside the red circle).

ARC Daisy Chain Diagram

Now look at the BPC diagram.  That is consistent with the above.

BPC Daisy Chain Diagram

Now let's look at the AMC Diagram.  It's different.  Question 1:  Is this right?  Why?

AMC Daisy Chain Diagram

Question 2:  For the 4 power connections on a TMCC component (ARC, BPC, AMC, ASC), is there an incoming pair (the right side) and an outgoing pair (the left side)?

Thanks!!

George

TCA, NMRA, PRRT&HS Modeling the PRR Panhandle Division between 1948-1957.

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Original Post

I'm sorry, how is it different?  They just wired two wires to the same terminal.  That four terminal group has two connections paralleled inside, so it's electrically the same.  You'll notice that it's labeled A U  A U.  The two A terminals are common and so are the two U terminals.

gunrunnerjohn posted:

I'm sorry, how is it different?  They just wired two wires to the same terminal.  That four terminal group has two connections paralleled inside, so it's electrically the same.  You'll notice that it's labeled A U  A U.  The two A terminals are common and so are the two U terminals.

Thanks John.  I definitely noticed the labeling and suspected that there was (electrically) no difference, but the diagram was different.  It was the inconsistency that bothered me.

Based on this, I can connect power wire pairs to these components using either of the A U pairs, correct?

George

TCA, NMRA, PRRT&HS Modeling the PRR Panhandle Division between 1948-1957.

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