NEMA Application Guide for AC adjustable speed drive systems

The application of AC adjustable speed drive systems has presented many unique challenges not only to electrical equipment manufacturers, but also to electrical equipment end users as well. In an effort to aid the user in proper selection and application of AC adjustable speed drive systems, the National Electrical Manufacturers Association (NEMA), through combined efforts of its Motor and Generator Section and its Industrial Control Products and Systems Section, has recently published an Application Guide for AC adjustable speed drive systems. This paper summarizes key topics addressed by the guide that will enable the user to avoid common application pitfalls and assist the user in clearly communicating critical application information and requirements to the electrical equipment manufacturer.