Patent ID: 7899579
Filing Date: 2011-03-01
Classification: F24F,G05D,Y02B

Abstract:
1. A method for controlling the operation of an HVAC system comprising a motor; a motor drive for the motor, and a controller for the motor drive, wherein the controller includes a program section having a plurality of optically programmed devices, each of which is comprised of a radiant energy emitter electrically driven by an input signal to control the output thereof, a sensor operatively coupled to the emitter; and associated elements which cooperate with the emitter and the sensor to provide a programmed response to one or more variables thereby defining an operating profile for the system; the method comprising the steps of: determining a value of a first variable characterizing the environment in a space served by the HVAC system; determining a value of a second variable characterizing incoming electrical power; coupling a first signal representing the environmental variable as an input to the program section; operating the program section in response to the first signal to generate an analog motor speed control signal according to a first profile; coupling a second signal representing the incoming power variable as an input to the program section; operating the program section in response to the second signal to control the delivery of operating power to the motor by the motor drive according to a second profile; and operating the motor drive to provide power to drive the motor at a speed related to the first and second profiles.