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VFDs are motor controllers which drive the motor by adjusting the voltage and frequency supplied to it. VFDs feature converter which consists 6 diodes, just like the check valves of a plumbing system. These diodes allow the flow of current in a single direction which is mentioned in the diode symbol.
The use of VFD has been increased dramatically in the field of HVAC applications. The common applications of AC drives are in air handler, chiller, pumps and tower fans. A better understanding of ac drive's working principle with leads to improve in application and selection of both equipment and HVAC system.