Be aware that when using a VFD on a machine, you cannot have any complicated circuits or DC motors in the machine. A VFD is designed to be connected direclty to a motor. I would investigate taht SAC T145 shaper to see what kind of internal circuits it uses. It does have manual raise/lower/tilt adjustments, but there are additional controls on the front. If your electrically creative, you can probably wire in a VFD between the machine control circuits and the motor.