PSX AR + Turnout Control hit and miss

[Mark W]

Anyone have experience with the PSX AR with a stall motor (Tortoise) hooked up for automatic turnout control?

I just finished this installation on one of our return loops and am getting mixed results.  About 50% of the time, the system shorts rather than reverses. 
It almost seems to be related to how much load is on the return loop when the train exits.  For instance, if I'm running a 4 unit lashup, it shorts more frequently than a single unit.  Same relationship for speed; faster = higher short rate. 

These are supposedly rated from Z to G, so I figure 4 N Scale units even at full power shouldn't be close to overloading it.  My other PSX AR's work perfectly, though they don't have a stall motor hooked up. 

Am I missing or overlooking something?

[GaryHinshaw]

I have not encountered this particular issue before so I can't help, sorry.  But I have had very good luck with the folks at DCC Specialties answering technical questions like this one.  Since the board is intended for exactly the situation you describe, there must be a setting you can tweak to make it work for you, since it seems to be highly configurable. (You might also have a faulty board - one of my 6 OG-CB boards from them was DOA, but they are replacing it w/o question).  Great supplier.
 

[Mark W]

Thanks Gary.  Yep, must have been a faulty board.  I swapped it with another one and now the loop works like a charm.  The faulty one still works great without the stall hooked up so must be an isolated issue with the stall driver. 

[bdennis]

Mark.
 I have a PSX-AR-SC on my layout and have had for about 5+ years. It has a snap coil (old H&M turnout machine) attached and it works flawlessly everytime.
So it is slightly different to yours but the auto reverser works perfectly.
it works so well, that the insulating joiners are on the frog end of a Atlas c55 turnout and the frog is powered by the switch on the H&M turnout machine.
At any speed I can run a loco through it and it will detect and throw the turnout before the loco gets from the insulated joiner to the frog.. All of about 10mm and will not short at all.

Give the guys at Dcc specialties a call.. they are great to work with..

How old is the unit.. What version is on the documents / instructions that came with it. It could have a old firmware version in it if it has been sitting around for some time..