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Circuitron AR-2 and DT-4

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  • Member since
    December, 2009
  • 104 posts
Circuitron AR-2 and DT-4
Posted by mkepler954 on Wednesday, May 08, 2019 8:50 PM

I recently purchased the AR-2 and DT-4 circuit detection modules.  These require 2 power sources- variableDC throttle power and a 12-18V DC power supply.  Do I also have to have separate DC power supply for the tracks to run the train or will the AR-2 "out" to the tracks run the train?  

  • Member since
    December, 2015
  • 5,499 posts
Posted by BigDaddy on Wednesday, May 08, 2019 9:27 PM

The way I read the instructions the variable DC is the input to the AR-2 that supplies the track power.  The constant power runs the detection circuit.

Henry

COB Potomac & Northern

By the Chesapeake Bay

  • Member since
    December, 2009
  • 104 posts
Posted by mkepler954 on Thursday, May 09, 2019 8:11 PM
I tried that but got no power to the track. I also have no power at the transformer terminals but do when I disconnect the wires from the transformer DC terminals.
  • Member since
    December, 2015
  • 5,499 posts
Posted by BigDaddy on Thursday, May 09, 2019 8:22 PM

mkepler954
I also have no power at the transformer terminals but do when I disconnect the wires from the transformer DC terminals.

I don't have one so maybe I am missing something really obvious.  Sounds like a short is turning off your transformer.

Henry

COB Potomac & Northern

By the Chesapeake Bay

  • Member since
    December, 2009
  • 104 posts
Posted by mkepler954 on Friday, May 10, 2019 2:22 PM
I do believe a short is causing the problem. Anyone know if there should be continuity on the AR-2 between the 2 "out" terminals going to the track when the wires are disconnected???
  • Member since
    September, 2004
  • From: Dearborn Station
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Posted by richhotrain on Friday, May 10, 2019 2:56 PM

Call Circuitron. They will answer and they will be able to help you with your problem.

They are located not far from me in the Chicago area, and their customer service is outstanding. Give them a call.

Rich

Alton Junction

  • Member since
    February, 2002
  • From: Reading, PA
  • 26,324 posts
Posted by rrinker on Friday, May 10, 2019 4:58 PM

 The instructions that come with the AR-2 show the complete hookup with a DT-4.

There should not be continuity between the two OUT terminals with nothing connected to the IN terminals on the AR-2 and nothing on the track (or with the AR-2 completely disconnected). 

 Wire it EXACTLY as shown in the instructions. The AR-2 IN goes to your power pack, the OUT goes to your track. THe + and - are for the power supply that runs the AR-2 (and DT-4, which has the same + and - terminals). The DT-4 does nto in any way connect to the track. It uses photocells to detect the train.

                                     --Randy

 


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

  • Member since
    December, 2009
  • 104 posts
Posted by mkepler954 on Friday, May 10, 2019 9:16 PM
I did wire as shown in the instructions. To find the short, I disconnected every wire from the AR-2 and tested each connection with an ohmmeter. That's how I found the short between the two out pins going to the track. Sounds like I need a new AR-2.

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