Patent ID: 6137416
Filing Date: 2000-10-24
Classification: A61M,Y10S

Abstract:
A method of controlling a centrifugal pump, which comprises:generating a selected speed signal signifying a selected rotational speed for rotating a motor to rotationally drive said pump,interpreting said selected speed signal and generating a speed control signal signifying a desired rotational speed output for a controller for controlling said motor,controlling said motor to rotate the motor according to said speed control signal,sensing actual rotational speed of the motor and outputting a monitor signal signifying the actual rotational speed,checking said selected speed signal and said monitor signal and if the monitor signal is within a predetermined limit of allowable variance of the selected speed signal, then outputting a display signal, but if said monitor signal is outside said limit, sampling said monitor and selected speed signals in a predetermined protocol and if said monitor signal remains outside said limit under said protocol, then outputting an alarm signal, anddisplaying the rotational speed of the motor responsive to said display signal or an alarm responsive to said alarm signal or displaying both said rotational speed and said alarm.