Its actually very simple and i did not say you needed to modify the power supply.
There are two 43V outputs on the power supply, just use these to power the drivers.

Quote Originally Posted by John11668 View Post
Bought all the kit from Zapp automation!
motors nema23 SY60STH88.3008
Drivers PM542
Think the Bob is PCPPS-3
Spindle control board 2V1.2

They have suggested a mod to get the voltage down.
See attached