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(11)    Patent No :    AP 2193    (73) Applicant(s)       
(21)    Application No :    AP/P/2007/004184    ITT MANUFACTURING ENTERPRISES INC, 1105 North       
            Market Street, Wilmington, DE 19801,       
                   
(22)    Filing Date :    15.06.2006    United States of America       
(24)    Date of Grant &    07.01.2011           
                   
(45)    Publication :

(30)    Priority Data                    (72) Inventors   
    (33) Country    (31) Number    (32) Date    ZHONG Zhiyong, Sweden   
    EP            PCT/EP05/05287 21.06.2005    MÖKANDER Jürgen, Sweden   
                8                   
                                       
                                (74) Representative   
(84)    Designated State                   
                           
    BW    GM    GH    KE    LS    MW    MZ   NA   SL    HONEY & BLANCKENBERG   
    SD    SZ    T Z    UG    ZM    ZW               
                   
(51)    International    Classification    F04D 15/00 (2006.01)    F04B 49/06 (2006.01)   
                            F04D15/02 (2006.01)       


(54)    Title

Control system for a pump

(57)    Abstract

The present invention relates to pumps comprising variable frequency drive means and methods for operating such pumps. The inventive method for operating a pump (1) comprises the steps of, obtaining values of operating parameters of the pump (1) indicating pump conditions, communicating said values of operating parameters from variable frequency drive means (2) to a control device (11), determining if a predetermined condition is fulfilled, communicating instructions from the control device (11) to the variable frequency drive means (2), based on the fulfillment of said predetermined condition. Furthermore, a computer program product loadable into a memory of a digital computer device, including software code portions for performing the inventive method, a pump (1), a pump system and a control device (11) for a pump are described.

(56)    Documents Cited :    EP 1054506 A1    US 592582 A1    US 6481973 B2

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