Patent ID: 8282361

Claim:
A pumping apparatus for a jetted-fluid system comprising a vessel for holding a fluid, a drain, and a return, the pumping apparatus being connectable to a power source and comprising: a pump comprising an inlet connectable to the drain, and an outlet connectable to the return, the pump adapted to receive the fluid from the drain and jet fluid through the return; a motor coupled to the pump to operate the pump, the motor configured to operate at a first speed and at least one second speed; a current sensor coupled to the motor and configured to generate a first signal having a relation to a current applied to the pump motor; a switch connectable to the power source, coupled to the motor, and configured to control the current through the motor; a controller coupled to the current sensor and the switch, the controller configured to determine a voltage having a relation to the motor and generate a value to control the motor based on the first signal, the determined voltage, and a phase angle between the first signal and the determined voltage, the value having a relation to a motor power value, the controller further configured to monitor the value, determine whether the monitored value indicates an undesired flow of fluid through the pump, and control the motor to cease operation of the pump based on the determination indicating the undesired flow of fluid through the pump; and a first circuitry coupled to the current sensor and to the controller, the first circuitry configured to receive the first signal and produce a second signal representing an averaged value for the first signal.