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?

 

feedback card is used to wire encoder so VFD can know for sure what the motor speed or position is - and not just an estimate. this would be essential in positioning applications or sharing load, tracking another drive etc.

 

The card will give you precise control of the VFD, but it looks like you would have to intercept the encoder signal or at least just use a encoder alone for monitoring purposes, as the signal is only used exclusively for the card/drive.
Not sure whether it would be available in memory via the Modbus connection though.
Max.