The VFD I plan on using; DURApulse GS3 series AC drive: https://www.automationdirect.com/static/specs/gs3drives.pdf Model: GS3-22P0 The feedback card accessory for the VFD: https://www.automationdirect.com/static/specs/gs3fb.pdf Hi everyone, I would like to know if I need this feedback card to obtain RPM of a motor that is being wired using the VFD specified above. I plan on controlling a 3 phase motor with the program Labview. I will be using MODBUS to communicate between the VFD and Labview. The end goal of my project is to plot the force of a load cell with respect to an increasing motor RPM so I was wondering how to get the RPM feedback from the motor. What exactly is the main purpose of this feedback card? In what kind of applications would this card be needed?