Variable Frequency Drives - Installation & Troubleshooting This book explains how to install and configure VFDs. It includes discussions on function, selecting different control modes, programing parameters, and how to troubleshoot using fault code diagnostics. It provides essential details necessary for anyone wanting to develop a greater understanding of drive technology and Pulse Width Modulation. Written by a technician for other technicians, Mr. Anderson focuses on learning how to troubleshoot and quickly resolve drive problems. Also provided are easy to understand diagrams and testing procedures.