debco99,
likewise, there isnt a way that the old machine couldnt be used for VFD's..
1.) If the motor is a dual winding dual speed, vfd is applicable.
2.) If the motor is a tapped winding dual speed, vfd is also applicable. This is used mostly in batching plant for agitation and mixing purposes.
it is noteworthy, that you must take all the neccesary data from the motor to match with your VFD like; voltage, current, rpm, frequency, etc. By using dual speed application of the machine, all VFD's have preset speeds ranging from 1 to 6 preset speeds.