Wattmeter circuit for operating a grinder pump assembly to inhibit operating under run dry or blocked conditions
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United States of America Patent
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Mar 25, 2014
Grant Date -
May 12, 2011
app pub date -
May 14, 2008
filing date -
May 14, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method for operating a grinder pump station and inhibiting the likelihood of operation of a grinder pump assembly under at least one of a run dry condition and a blocked condition includes providing a wattmeter circuit operably connected to the grinder pump assembly and measuring real power using the wattmeter circuit during operation of the grinder pump assembly to process sewage received in a tank and discharge the processed sewage from the tank. The grinder pump assembly is automatically turned off based on the real power (e.g., average value of the product of instantaneous values of voltage and current over time) measured by the wattmeter circuit due to the at least one of a run dry condition and a blocked condition.
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