Totally Confused by Z4000 vs ZW-L and MRC O27 Short Circuits | O Gauge Railroading On Line Forum

WinstonBOGR Forum Member DIGITAL SUBSCRIBER

I’ve been running my layout for the past two years without any faults, using a Z4000 transformer ( See attached diagram). I run only command with MTH DCS and Lionel Legacy with LCS. I use my IPad, LCS App and the CAB 2 to control switches and routes on the layout. Last year, I bought a ZW-L to use on my next layout. However, when I replaced the Z4000 with the ZW-L the PSX-1AC shows a short circuit. Switched the ZW-L with a MRC Dual Power O27 transformer and it also shorts the PSX-1AC. Reconnect the Z4000 and everything is heavenly. What am I missing? HELP!

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6/21/212:45 PM

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cjackOGR Forum Member DIGITAL SUBSCRIBER

Could be tripping the D11 diode at the input to the PSX-1AC. Maybe due to the nature of the switched ac output of the ZW-L. Remove those diodes (surface mount) and use the transient suppression recommended by GRJ. I don’t have the part # handy. But it’s 1.5 something 36.
The issue with those diodes is in the PSX instructions

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

1500W 33.3V TVS at Digikey

WinstonBOGR Forum Member DIGITAL SUBSCRIBER

Thanks cjack! I need to read the PSX instructions and review GRJ’s posts. I’m,also, going to pull the PSXs and connect to the TUI for a test run before I start tinkering.

WinstonBOGR Forum Member DIGITAL SUBSCRIBER

@gunrunnerjohn posted:
1500W 33.3V TVS at Digikey

Thanks GRJ!

bluedragonOGR Forum Member DIGITAL SUBSCRIBER

Hi, i am getting ready to setup something similar with the z4000. Whats a PSX-1AC ?

cjackOGR Forum Member DIGITAL SUBSCRIBER

@bluedragon posted:
Hi, i am getting ready to setup something similar with the z4000. Whats a PSX-1AC ?

DCC Specialties PSX1-AC 3 and 2 Rail Intelligent Circuit Breaker (tonystrains.com)

WinstonBOGR Forum Member DIGITAL SUBSCRIBER

Thanks Guy, it was the PSX boards. Once I disconnected them, everything worked with the ZW-L. I’ll remove the D11 diodes and do GRJ fix later. 👏👏

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