Define a Variable Frequency Drive (VFD) and list two typical energy-saving benefits in pumping applications.

Define a Variable Frequency Drive (VFD) and list two typical energy-saving benefits in pumping applications.

• A. A device that increases motor speed beyond rated maximum.
• B. A device that starts the motor with a fixed voltage and frequency.
• C. A device that reduces energy consumption by soft starting and speed control.
• D. A device that controls motor speed by varying supply frequency and voltage.

Answer: (D)