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

W 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!DF13C0E7-8626-4925-8702-2455D0B08EFC

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cjackcjackOGR 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

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