Variable Frequency Drive - Purdue University Calumet

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ASD Advantages & Disadvantages Adjustable Speed Drives have a number of advantages and disadvantages compared to other types of variable speed controls including: Advantages Energy Savings Improved Process Control Reduced Voltage Starting Lower System Maintenance Bypass Capability Multi-motor Control Disadvantages 1. Initial Cost 2. Motor Heating at low Speeds 3. Maintenance 4. Output Harmonics 5. Induced Power Line Harmonics
Advantages - Energy Savings Adjustable Speed Drives can be used to save significant amounts of energy in process operations compared to traditional control methods where the load or speed of the operation varies. AC Adjustable Speed Drives are among the most efficient types of speed control when used on axial (variable torque) loads like centrifugal fans, pumps and compressors. As the motor reduces the operating speed of the fan, pump or compressor, the horsepower required to operate the system is greatly reduced. This is a major advantage of the ASD and one of the primary reasons ASD’s have become so popular in many process operations.
Page 1 and 2: Variable Frequency Drive Masoud Fat
Page 3 and 4: • AC Adjustable Speed Drives (ASD
Page 6 and 7: Power and Torque ASD's actually con
Page 10 and 11: Variable Torque Loads Variable torq
Page 12 and 13: Advantages-Reduced Voltage Starting
Page 14 and 15: ASD Disadvantages ASD's are not the
Page 16 and 17: Types of AC ASD's There are three d
Page 18 and 19: Current Source Input (CSI) The CSI
Page 20 and 21: ASD Example Problem (Variable Torqu
Page 22 and 23: Estimate actual motor loads at each

Variable Frequency Drive - Purdue University Calumet

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