AC adjustable-frequency drives

AC adjustable-frequency drives save up to 40 percent of fan-motor energy compared to standard fixed-airflow systems. In cooling-tower applications, drives reduce fan noise and eliminate fan cycling as well as the need for output-water throttling valves, while maintaining water at design temperatures. Suitable for interfacing with computers and energy-management systems, drive controls can be mounted remotely from the motor and can use existing motor wiring. (Danfoss Graham) Circle 7

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