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VFD Pump Operation

VFD Pump Operation

In the system we installed, variable frequency drive (VFD) pumps are run individually or in groups to maintain a desired pressure for an elevated storage tank (EST) and distribution system. In normal operation, three VFDs are operating with a fourth reserved to overcome large pressure drops. The VFDs can be controlled automatically by a PLC only when in the Auto control state. When the PLC is placed in the Manual control state, PLC control is disconnected.