3 phase machine conversion

[parrotcam]

Hi,

I am new here and am not an electrician, although I do electronics work occasionally.

I have a Swiss made machine tool that has been moved to a location with no 3 phase power and I have a VFD that could run one of the two motors for the near term. One (or two?) VFDs could be added later to run the second two-speed motor, but I don't need that for the time being. The extant circuitry allows switching between the high speed motor and either of the two coils in the two-speed motor. The main start switch also allows the motor to be reversed for slowing or stopping the spindle by pushing it slightly past center when stopping the machine.

What I'm wondering is if there could be a way to wire VFDs into the extant circuit and allow it to behave somewhat like it does now. I assume a braking resistor would be required to attempt to emulate the spindle slowing/stopping function, but I could certainly live without that. I've spent some time comparing the schematic to the actual circuit but I'm still not clear about how it works or if there is a way to integrate VFDs into it. The source current will come from a 230 single phase circuit.

I have not been able to get a photo to insert inline, so I am adding a link to the image of the schematic. Sorry about the inconvenience of that.

 

[Little Bill]

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