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PSX-AR Snap Coil Wiring & Switching Polarity Automatically

Posted by on Jul 16, 2015 in Tips DCC Components, Tony's Tips |

Hi Guy’s, I’m looking into purchasing 2 PSX-ARSC units but have some questions?

1) I am using Hornby 3 wire point motors (switch motors). On the circuit board you show two common terminals. Do I wire the Hornby common wire to either one of the common ports or do I need to add a jumper across both common ports?

2) I want to use the units on a reversing loop. After the train enters and travels sufficiently round the loop so that the current and the point motor switch what happens next? More precisely, after train leaves the reversing loop what happens?
A) Does the polarity and points stay as they are until the next train enters (and goes round in the opposite direction) and then the current and points switch back; or,
B) Does the polarity and points revert back to the start position / polarity, and if so what triggers the switch back?
C) Either option above is fine – I just want to make sure that I don’t end up in a situation where the polarity of the track reverts back but the points (switch) doesn’t. Thank you Kevin Jones


PSX-AR Pictured Click to Enlarge

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Hi Kevin,
On the PSX-ARSC the J9-2 and J9-4 pins are wired together and are the coil common. You can connect the common wire from your coils to either one (two are provided since some coils require 4 connections). J9-1 and J9-3 then control the remaining connection to each coil.

After the train leaves the loop, the points and polarity remain in the position they were in when the train exited the loop. The track polarity and point position are linked together in software, so they remain locked together. You can manually change the point position/polarity by sending an accessory on or off command to the switch address on the PSX-AR. The default address is 2044. Since the PSX outputs are locked together, you must make sure the point position and track polarity match (for a given point position, the first part of the reverse loop encountered should be in phase). If they don’t, simply reverse the leads to your switch machine.