Totally Confused by Z4000 vs ZW-L and MRC O27 Short Circuits

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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