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looking for best idea to control motor speed. I have an inverter driven shaft winding up material on a roll. I am applying a coating onto material and need to control speed by SFPM to maintain coating thickness. as roll gets bigger sfpm increases, so I need to slow the drive proportionally. I'm using a red lion frequency to analog module then red lion analog signal inverter to output to drive to slow down as roll gets bigger. problem is SFPM still increases??