What is the main advantage of using a VFD over a mechanical starter for controlling the speed of an AC motor?
A. Greater energy efficiency
B. More precise control of speed
C. Lower cost
D. Greater reliability
Answer:B
What is the main advantage of using a VFD over a mechanical starter for controlling the speed of an AC motor?
A. Greater energy efficiency B. More precise control of speed C. Lower cost D. Greater reliability
Explanation: One of the main advantages of using a VFD over a mechanical starter for controlling the speed of an AC motor is that a VFD allows for more precise control of speed. This is because a VFD can continuously adjust the voltage and frequency of the power supplied to the motor, whereas a mechanical starter can only start and stop the motor. This allows a VFD to provide smooth and precise speed control, which is particularly useful in applications where precise speed control is critical such as conveyors, pumps, and fans.