What is a VSD and how can it save energy on a water pump?

A VSD (variable speed drive) is a piece of equipment used to change the speed of an electrical motor. In situations where the water pump supplies too much pressure or flow, a VSD is used to reduce the speed for optimal flow or pressure. Less energy is required at lower speeds and thus the saving. Please note that lower pump speed also results in less pressure and less water flow. In applications where less pressure or flow is not required, a VSD will not contribute to power savings.