Fairfax County Water
With an oversized motor and only a control valve to control flow, the County wanted finer pump control through either a VFD or a MagnaDrive ASD (allowing them to adapt the pumping system as needed to demand). As this is a 2300V application, the VFD was quoted at $100,000, a figure at which the County balked.
- Fairfax Water installed a 24.5 Rigid Pedestal Adjustable Speed Drive on the pump in 2014.
- The ASD was 50% less expensive than the VFD option
- After the ASD was installed, the pump station’s efficiency increased by over 50% (see chart).