초록 ▼

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 couple

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.

대표청구항 ▼

In a heating and cooling system having a control potentiometer disposed for manipulation by a user to control the position of a remote actuator in the system between open and closed positions, a quick-calibrate control module for responding to setpoint signals from the control potentiometer to drive

In a heating and cooling system having a control potentiometer disposed for manipulation by a user to control the position of a remote actuator in the system between open and closed positions, a quick-calibrate control module for responding to setpoint signals from the control potentiometer to drive the actuator to corresponding positions, the control module comprising, in combination: a motor coupled to the actuator and a feedback potentiometer coupled to the motor for producing a feedback signal relating to the actuator position; summing means for combining the setpoint signal and the feedback signal to produce an error signal; means responsive to the error signal for driving the motor to minimize the error signal; a reference supply connected to the control potentiometer, the reference supply including zero setting means for adjusting the setpoint signal to produce an error signal which calibrates the closed position of the actuator to a corresponding setting of the control potentiometer; scaling means for scaling the feedback signal to produce an error signal which calibrates a desired open position of the actuator with a corresponding setting of the control potentiometer; and means for establishing a common reference related to the setpoint signal to prevent cross loading between the reference supply and the scaling means, so that the scaling means can be adjusted without altering the zero setting of the actuator.