Energy efficient sewage pumping system with a controller and variable frequency drive and method
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United States of America Patent
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Jul 7, 2015
Grant Date -
Jan 24, 2013
app pub date -
Jul 13, 2012
filing date -
Jul 18, 2011
priority date (Note) -
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Abstract
A system includes a pump that is operative to move liquid out of a reservoir. The system also includes a depth level sensor that is operative to determine a depth level of the liquid in the reservoir, and a controller operatively connected to the depth level sensor. The system further includes a variable frequency drive operatively connected to the motor and the controller. Responsive to the determined depth level of the liquid increasing to a first level, the controller is operative to start operation of the motor. The variable frequency drive is operative to control the speed of the motor. The controller is operative to cause the variable frequency drive to output an optimum frequency that causes the motor to operate at substantially the lowest usage of energy to lower the depth level of the liquid in the reservoir from the first level to a second level.
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Family
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