Conversion of a fixed speed drive to an adjustable speed drive using a slip energy recovery system

A recently delivered drive system for an existing fixed-speed fan provides an example of how, with a slip energy recovery (SER) drive system, the change from a fixed-speed to a variable-speed drive was realized. This paper describes the reason for the change, the function and also the economical advantages of an adjustable-speed drive in this application with the SER drive configuration. This paper also states and explains why this type of drive system is attractive. SER drive systems are accompanied by an availability almost unreachable using other configurations