designed to reduce the cost and size of pumping systems, while increasing the reliability. This new controller consists of a variable frequency drive ( VFD) with application specific software that can control the speed of one or more pump motors. Blowers and fans applications are energy-consumming applications in industries. Using the CMT-C3 sereis ac drives, the energy saving rate could be 20% -50% reduce. Many kinds of pumps are now used in applications in industries, expecially in water supply and water cyclling. The CMT-C3 series AC drives have been suceessful used in pumps applications for years.