A VFD control panel is designed to safely control the speed of the electric motor and feed pump. Variable frequency drives are used for adjusting flow or pressure to the actual demand. Significant power savings can be achieved when using a VFD pump. V/f Control (Volts per Hertz) 2). At the same time, they extend. Variable Frequency Drives (VFDs) are electronic controllers that allow electric motors to run at variable speeds by adjusting the frequency and voltage of the power supplied to the motor. In a typical VFD electric motor setup, the VFD modulates the motor's input to achieve precise speed control. NORD VFDs already. Increase production uptime, throughput & energy savings with Allen‑Bradley variable frequency drives (VFDs). Our devices easily integrate.