Applied Power and Controls, Inc. was the lead Electrical Engineering firm for the upgrade of the Aerodynamic Lab 200HP Variable Frequency Drive (VFD). The original drive was installed in the ‘80s. Our duties and responsibilities included field investigation, design, equipment selection, and technical assistance during removal/installation and commissioning services. The new VFD was designed and retrofitted to interface with the existing computer controlled system for the Wind Tunnel. All design work was completed ahead of schedule, which allowed the equipment to be procured and installed within the time allotted during shutdown of wind tunnel.