That's not a good idea at all, good that you're going to change it. I guess it depends on how robust the 48v power supply is relative to the current draw of the steppers as to whether it will handle all three steppers. Z typically doesn't run as fast as X and Y so is there a problem with the Z axis as it is now on 36v?
I'm attaching the schematic I drew when I designed and built my CNC. Disclaimer - I am not an electrician or engineer but I drew this almost 5 years ago and it worked the first time and is still working, so take this as a guide only.
Enable is optional and even though it's on my schematic I chose not to wire those terminals. I don't even recall what they do or why I chose not to use that function.
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