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VFD Panle (Variable-Frequency Drive)

The VFD system automatically maintained a desired water level in the discharge standpipe. The
lower set point has the potential to lower the energy consumption of the pumping station slightly.
Maintenance of the set point was accomplished by mounting a water level sensor inside the
standpipe that works in conjunction with a process controller. The process controller generates a
signal that controls the output of the VFD on one of the pumps. Because the speed of the pump
can be varied, this VFD pump may also be referred to as an adjustable speed drive (ASD) pump.
This pump, used by itself or in conjunction with any other pump, provides full flow variability up
to the capacity of the plant. With this control, the objective of reducing wasted energy
consumption can be met.

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