WHY OH WYE?

Every once in a while, a project that seems to be simple turns out to be anything but.  Such was the case for my long-delayed hook up of the Cascade Summit wye.  In concept, this should have been no different than the installation of components for the Oakridge wye—a task accomplished a couple of years ago.  Instead, the new installation at Cascade Summit lead to a couple of weeks of frustration as I tried to understand why the same auto reverser used for Oakridge would not function at Cascade Summit. 

In both locations, I use an OnGuard Auto Reverser.  The auto reverser is connected just to the tail track, the wye switch, and a few inches of wye leg tracks.  The Oakridge installation has been working flawlessly for a couple of years.  Why would the new installation at Cascade Summit not work?

I did continuity checks, voltage checks, using an RRampmeter (DCC voltage and ammeter) and tried bringing the power for the wye tail section from the nearby wye base and leg circuit rather than a separate pair of leads from the station panel terminal block.  I even tried reversing the power leads to the auto reverser.  All that did was change the leg of the wye that would work.  A board swap, prompted by the DCC Specialties folk just had the Oakridge installation still working and the Cascade summit installation not working.

I finally took note that the PSX circuit breaker for Cascade Summit would trip, showing a short, but the auto reverser would not trip.  That was the major clue as to what was going on.  The PSX was tripping faster than the OnGuard auto reverser for the Cascade summit Installation.  I checked the PSX circuit breaker instructions to see if there was a way to change the circuit breaker timing.  No such luck in the instructions.  I consulted with my DCC experts.  They at least confirmed I likely was on the right path dealing with circuit breaker trip time.

I did note a slightly different form factor (board width) and a couple of other detail differences between my older PSX circuit breaker boards and the much newer ones installed for Cascade Summit.  I also noted a change in the instruction package for the PSX between my earlier breakers and the new ones.  Something had changed.  Finally, a desperate e-mail to DCC Specialties, sent over the weekend, netted instructions on setting the PSX trip time.  Kudos to them for a Sunday response!!!!

After considering my options, I elected not to change the PSX circuit breaker trip time.  I will reserve that for the future, should I encounter further problems.  Instead, I swapped the old PSX boards at Springfield (my original installation) for the boards at Cascade Summit and McCredie Springs.  The combination of the old PSX boards works with the OnGuard Auto Reverser.  I now have that set up at both Oakridge and Cascade Summit.  It works!!!

The pictures below will show ways to identify the various circuit boards on my layout.

PSX circuit breakers for Eugene and Oakridge.  Two new breakers are at the top of the stack.  The other four are older, purchased in 2012.

Old style PSX circuit breakers for Oakridge.

New PSX circuit breakers now installed at Springfield.  Note the “ET” brand in a circle silk-screened in the lower left corner of these two boards as they are mounted.  The mounting is inverted, so the “ET-in a circle” mark would normally be in the upper right corner.  These were the boards that caused me problems with my OnGuard Auto Reverser.

OnGuard Auto Reverser installed for the Oakridge wye.  Ooops.  It looks like I pulled out the red wire leading to the wye tail track on the right!

Cascade Summit OnGuard Auto Reverser.  It now functions!

Test power on the RR-East leg of the Cascade Summit wye.

Test locos on the wye tail track.

Test locos have come out of the wye and are on the RR-West leg of the wye.  Very sharp eyes will find the lead axle of the rear truck of the rear loco, SP 7428, is over one of the rail gaps for the wye.  Note that the headlights are on, so the auto reverser has done its work.

This was a long tale about what should have been a simple installation.  In fact, it took me more than two weeks with daily trouble shooting efforts to finally resolve the issue.  “There be dragons” out there!