The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2013
Filed:
Dec. 11, 2006
Robert W. Stiles, Jr., Cary, NC (US);
Lars Hoffmann Berthelsen, Kolding, DK;
Peter Westermann-rasmussen, Soenderborg, DK;
Gert Kjaer, Soenderborg, DK;
Florin Lungeanu, Egernsund, DK;
Robert W. Stiles, Jr., Cary, NC (US);
Lars Hoffmann Berthelsen, Kolding, DK;
Peter Westermann-Rasmussen, Soenderborg, DK;
Gert Kjaer, Soenderborg, DK;
Florin Lungeanu, Egernsund, DK;
Pentair Water Pool and Spa, Inc., Sanford, NC (US);
Danfoss Low Power Drives, Graasten, DK;
Abstract
Embodiments of the invention provide a system including a pump, a motor, and a controller. The controller establishes a baseline value of power consumption during a deadhead condition, increases a counter when a current value decreases below the baseline value, and determines a deadhead condition when the counter exceeds a limit. The controller also compares a current value to an immediately previous power consumption value to determine an entrapment condition indicated by a sudden decrease in power consumption.