Variable frequency drive (VFD) usage has increased dramatically in Conveyor, Drilling, HVAC and many other applications. The VFDs are now commonly applied to air handlers, pumps, chillers and tower fans and conveyor motors. A better understanding of VFDs will lead to improved application and selection of both equipment and other systems. This course is intended to provide a basic understanding of common VFD terms, VFD operation, and VFD benefits.