Method and means for monitoring a control apparatus
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United States of America Patent
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Jul 31, 2001
Grant Date -
N/A
app pub date -
Jun 5, 1998
filing date -
Jun 5, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method and means for monitoring a control apparatus having at least one actuating drive, a valve, a spindle, and a positioner, whereby a reversal of direction of a valve spindle, by means of manipulated variable changes that are well-defined, reproducible and uniform, supplies useful information for the monitoring of the state of the control apparatus. For example, a comparison with target values and a diagnosis can take place by means of measurement and processing of valve positions (h) and the times (t) at which the valve positions are assumed, during the reversal motion. In addition, during times of uniform motion, the speed of movement or, respectively, in the case of predetermined valve positions, the allocated runtime, can additionally be determined. Moreover, given an inverted direction of motion further diagnosis possibilities can be supplied by means of repetition of the measurement and processing.
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