The Variable Frequency Drive (VFD) industry is growing rapidly, and it is now more important than ever for technicians and maintenance personnel to kep VFD installations running smoothly. This reference is ideal for gaining access to information about variable frequency drives, including how they work, how to apply them, and how to troubleshoot them. This Reference contains sufficient information for a technician to troubleshoot any AC variable frequency drive, virtually eliminating the need for manufacturer-specific manuals. Both industrial and commercial VFD applications are addressed, with discussion of installation issues, troubleshooting, metering, sizing and selection, energy savings with VFDs, and more.