Barber Colman Company

Fred Fauerbach

Eugene R Jornod

Lary L Field

A quick-calibrate control module for use in a heating and cooling system is provided which responds to setpoint signals from a control potentiometer to drive a remote actuator to corresponding positions. The control module comprises a motor coupled to the actuator and a feedback potentiometer coupled to the motor for producing a feedback signal relating to the actuator position. Operational amplifiers combine the setpoint signal and the feedback signal to produce an error signal, and a comparator responds to the error signal and drives the motor to minimize the error signal. A reference supply is connected to the control potentiometer, the reference supply having a zero setting potentiometer which calibrates the closed position of the actuator to a corresponding zero setting of the control potentiometer. A stroke adjustment potentiometer scales the feedback signal to calibrate a desired open position of the actuator with a corresponding setting of the control potentiometer. The amplifiers also prevent cross-loading of the reference supply and the stroke adjustment potentiometer, so that stroke adjustments can be made without altering the zero setting of the actuator.

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Roscoe, IL, United States of America

Fred Fauerbach