Has anyone ever considered or accomplished this for compressor starting?
The benefits would be great, reduced inrush, no more replacing hard to get and undersized wye delta contactors..
You would configure the vfd for fast ramp up for lubrication demands, still using the slide valve for capacity control, and run the vfd wide open, (a soft starter).
It would require some creative control circuit changes..
You could probably still use the motor protector in addition to the vfd for motor protection.
An external weather tite cabinet would be needed, as well as the good appliance wire to connect the drive.
The coil voltage for the delta connection could be used to initiate the drive?