NEMA Publishes Application Guide for AC Adjustable Speed Drive Systems

The National Electrical Manufacturers Assn. has published NEMA Application Guide for AC Adjustable Speed Drive Systems.
By Consulting Specifying Engineer Staff January 24, 2008

The National Electrical Manufacturers Assn.
“This document is intended to facilitate the design, selection of components, and installation of AC electrical drive systems, particularly where an induction motor is used in conjunction with an adjustable speed drive,” said James E. Armes, section chairman.
According to Armes, this revision includes updated terminology and information on motor terminal voltage transients, fundamental contributors to peak voltages, and single-phase input for three-phase drives, as well as modification of the information on overload capability for motor selection. It also incorporates replacement of the term “cable corona inception voltage (CIV)” by “partial discharge inception voltage (PDIV).”
An electronic copy of NEMA Application Guide for AC Adjustable Speed Drive Systems may be downloaded at no charge, or a hardcopy purchased $101, by visiting NEMA’s Web site . IHS .