No1, I would be rather leery about putting large three phase SCR servo drives fed from a RPC, which is shared by the spindle motor.
Is the spindle drive also three phase? Either also SCR DC or 3 phase motor direct?
Also it would appear from the schematic that I only see one armature lead from the SCR bank, which could imply that the return would be to a 3 phase star point. Star connected transformer.
I don't seem to see it on the print.
I think T1,T2,T3 are phase sense transformers for the firing circuit for each phase.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.