Can a static phase converter be used to supply power to the controler only

cakeslob, thanks!!
No, I do not plan to "re-route your controller to the new highspeed spindle controller".

Attached is a close up (CN1, CN2 & CN3) of the section (you see not real great original, I will give handwritten response you can't read) you asked about. Also, a pic to where that circuit goes.

Many thanks for your help!