The VFD Panel (Variable Frequency drive panel) also known as the VFD Control Panel is designed to control the speed of the electric motor and feed pump. They are widely used in drilling, pumping, and other large machine applications like Conveyor and Compressor. 

AC motor speed is controlled in two ways – either by controlling the voltage or frequency. Frequency controlling gives better control due to constant flux density than voltage control. This is where the working of VFDs comes into play. It is a power conversion device that converts the fixed voltage, and fixed frequency of the input power to the variable voltage, and the variable frequency output to control AC induction motors.