G - Physics – 05 – B
Patent
G - Physics
05
B
341/97
G05B 19/19 (2006.01) G05B 19/33 (2006.01) G05B 19/35 (2006.01) G05B 19/4062 (2006.01)
Patent
CA 1236901
ABSTRACT There is described a microprocessor-based valve motor control system which provides control, predictive control and diagnostic functions for a motor operated valve. A valve stem position sensor measures the stem position and a load sensor measures the load on the valve stem. A microprocessor periodically tests the status of the motor operated valve, and turns off the valve's motor if certain predefined criteria for the valve stem position and the valve stem load are not satisfied. The periodic testing by the microprocessor includes comparing the valve stem position signal with a preselected open valve position when said valve is being opened; and comparing the valve stem load signal with a preselected maximum desirable stem opening load when the valve is being opened, and with a preselected maximum desirable stem closing load when the valve is being closed. When the valve is being opened, the system predicts the position of the valve stem at a predefined time in the future and turns off the motor if the predicted valve stem position is beyond a preselected open valve position. When said valve is being closed, the system predicts the load on the valve stem at a predefined time in the future and turns off the motor if the predicted load value exceeds a preselected maximum desirable stem closing load. Motor overload protection is provided by periodically measuring the actual load on the motor; comparing the motor load signal with a preselected maximum motor load value when said valve is being either opened or closed; and turning off the motor if the motor load comparison does not meet predefined motor load criteria.
512628
Electric Power Research Institute
Smart & Biggar
LandOfFree
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