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VFD system cost calculation

Let's start with the basics:

What is the application? How slow does your customer want to run?
What are the existing motors, are they capable of running on a VFD at slower speeds? What is the insulation rating of the current motors?
May or may not need new inverter duty motors.

As for the variable frequency drive a few questions are necessary:
What voltage?
What is the distance between were the VFD is mounted and the motor? looking for wire length. Might need a load reactor.
What is the power source? might require line side reactors
NEMA rated enclosure required for mounting of VFD?
What is the source of the speed command?
What is the source of the run command?
Is communication required?

After these questions are answered then the system pricing can be addressed.

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