variable frequency drives in water and waste-water facilities
A variable frequency drive (also called as VFD, frequency inverter, variable speed drive, VSD, ac drive, adjustable frequency drive) is an electronic controller that adjusts the speed of an electric motor by modulating the power being delivered. Variable frequency drives (VFDs) provide continuous control, matching motor speed to the specific demands of the work being performed.
Variabl frequency drives (VFDs, variable speed drives, VSDs) are an excellent choice for adjustable-speed drive users. They allow drive users to fine-tune processes while reducing costs for energy and equipment maintenance.
At water and waste-water facilities, the applications of variable frequency drives (VFDs) are so popular.
Figure below illustrates the reduced energy consumption of Variabl frequency drives (VFDs, variable speed drives, VSDs) over valve control systems at water and waste-water facilities.
For applications where flow requirements vary, mechanical devices such as flow-restricting valves or moveable air vanes are often used to control flow, which is akin to riving a car at full throttle while using the brake to control speed. This process uses excessive energy and may create punishing conditions for the mechanical equipment involved. Variabl frequency drives (VFDs, variable speed drives, VSDs) enable pumps to accommodate fluctuating demand, running pumps at lower speeds and drawing less energy while still meeting pumping needs.
