Digitrax using PSX circuit breakers (CB).

During operating sessions, while several trains were running, sometimes all the CB's would start flashing on and off shutting down the entire layout until the short was corrected.

It took me awhile but I was, finally, able to recreate the problem.  I put an engine on each power block district that each CB was controlling and then put a quarter in each block until the problem occurred.  

I emailed Larry Meier at DCC specialties and he gave me a few things to try.

First,  I had to make sure OPSW 18 was set to 'C'.

Next he suggested:

One other thought. If you have all PSX breakers set to the default trip current, it is possible that due to use in other power districts, there is not enough current available from the booster to trip the PSX. In your 8 array, you could theoretically draw 4*8 = 32 amperes from the booster without tripping any PSX breaker. You might try setting CV49=2 (trip current = about 2.5 amperes). This should be high enough to power a district, but should increase the ability to trip on a short. Try it first in whichever district is giving you the most problem.

My PSX manual on page 12 told me how to reset CV49=2.

The Digitrax manual on page 102/103 told me how to program CV's. 

These are my PSX CB's:

Per the instructions, programmer jumper was moved to J3-1 & J3-2 

You know you've got the programmer jumper in the right place as the output LED is off and the D6 LED blinks once.  

After entering CV49=2, the D6 blinked again so I knew the update was complete. 

After doing just one CB, I tested the 'quarter' short method and all seems good as only that one CB now trips.  More than one CB can be reset at once so I did the rest of the CB's as a group.  The lower amp setting seems to keep Digitrax and the CB's from 'fighting' each other.   I'll have to wait and see if the lower amperage is a problem with the main yards as that is where a lot of engines can reside.  I can always increase the amperage for those CB's.  I should be good as, although the roundhouses have about 24 tracks, each one has an on/off toggle and they are always in the 'off' position until the engine is needed.