Patent ID: 7777435

Claim:
An adjustable frequency pump control system comprising: a motor speed control unit producing a motor speed control signal that is applied to a motor that operates a pool's circulation pump, the motor speed control unit being configured to automatically adjust the frequency of the motor speed control signal to a specific frequency that corresponds to a particular design point of a pump's filtration cycle; an incoming three-phase power input for supplying power to the system; a power supply having an input connected to the three-phase power input and an output including at least a first voltage and a second voltage; a signal from a pressure transducer used to measure the pressure within the pool's filtration system, and when enabled by the second voltage, produces a line pressure signal. a computer readable medium storing one or more sequences of instructions for automatically adjusting the speed of the circulation pump within the pool's filtration system, which instructions, when executed by one or more processors to carry out a process including at least receiving the line pressure signal from the pressure transducer, via the motor speed control; comparing the line pressure signal with a set point, via the motor speed control; and generating a signal for adjusting the speed of the circulation pump to match the line pressure signal, via the motor speed control.