Facility management system with improved return to automatic con

Details Facility management system with improved return to automatic con Facility management system with improved return to automatic con

1991-01-31

1993-02-02

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

Condition responsive

318591, 34082506, 165 24, 165 25, G05B 700

Patent

active

051841223

ABSTRACT:
There is disclosed a control system for use, for example, in facility management which controls an environmental parameter to maintain the parameter at a given set point. A PID Controller is coupled to a remote sensor for generating a feedback signal responsive to the parameter level sensed by the remote sensor. The PID Controller is responsive to being coupled to a field device for providing the field device with an automatic control signal having a level derived from the sum of integral, derivative, and proportional actions to the feedback or error signal to place the field device under automatic control, and is responsive to being decoupled from the field device when the field device is under manual control for either terminating the generation of the automatic control signal or providing an estimate of a manual control signal. When recoupled to the field device, the PID Controller provides the field device with a control signal at an initial level based upon the level of a manually selected control signal, the last level of the automatic control signal provided to the field device prior to being decoupled from the field device or the last estimate of the manual control signal.

REFERENCES:
patent: 4451879 (1984-05-01), Welch et al.
patent: 4951476 (1990-08-01), Yamamoto et al.
patent: 4991770 (1991-02-01), Bird et al.
W. F. Stoecker and P. A. Stoecker, Microcomputer Control of Thermal and Mechanical Systems, 1989, pp. 413-414.

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