Mike: The fixed outputs are what I was referring to as aux outputs. Sorry for any confusion.
My question is why would you want to power your switches/turnouts with a separate power source? Is there some advantage to doing this? Wouldn't your Z4K transformer be well suited and reliable for this situation?
You may have a good reason for doing it this way and I can think of a couple of reasons myself. But I'd just like to know why you have this as part of your plan.