I have to look the prox switches up in the schematic to see what they do, but I remember that the paw 9short arm) and associated switch hold the quill from being forced down by the drawbar actuator and at the same time the Z drive is shut off and the control ignore the Z position (because it will move). When the drawbar releases, this all goes back to normal with Z position back to where it was. I am fairly certain that one prox switch is for Z in tool change position so the drawbar actuator will have enough stroke.
Prox switches are miniature metal detectors. Thus they have a power, and ground, and a signal wire. Check your schematic.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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