Patent ID: 6534940
Filing Date: 2003-03-18
Classification: B63J,F04D,H02H,H02P,Y10S

Abstract:
An electrical controller for connection with a motor driving a marine macerator pump and of the type having maximum and minimum allowable currents, said controller comprising:a housing; electrical connectors on said housing for connecting in circuit between said motor and a power source; a memory in said housing for storing maximum and minimum reference signals corresponding with the respective said maximum and minimum allowable currents, and a reference time signal corresponding with the maximum allowable motor operating time for one pumping operation; a sensor in said housing and connected with said memory and said electrical connectors for sensing the real time current level drawn by said motor to produce a sensed signal; a timer in said housing and operative to measure elapsed motor operating time to produce an elapsed time signal; a comparator in said housing, connected with said memory, sensor and timer and operative in response to said sensed signal exceeding said maximum reference signal and to falling below said minimum reference signal to generate respective first and second stop signals, said comparator further operative to compare said elapsed time signal with said reference time signal and responsive to said elapsed time signal exceeding said reference time signal to generate a third stop signal; and a control circuit in said housing connecting said connectors in circuit with said comparator and including a motor power switch, said control circuit responsive to a start signal to close said motor power switch to communicate power to said motor and responsive to either said first, second, or third stop signals, to open said motor power switch to remove power from said motor.