|1. Stabilize the process
either manually or automatically.
2. Set the controller to
manual mode (if the controller is still running under auto mode).
|3. Record the initial value
of the controller's output.
4. Mark a starting position.
A starting position must be several second a head.
|5. When the recorder's pen
reaches the starting point, make a bump at the controller's output of about
5 to 20%.
6. Record the final value of the controller's output.
|7. Stop the test when
ample of response curve is recorded.
8. Return the process back
to operating condition.
Further reading on open-loop process identification is available at:
1. Thomas B. Kinney, Tuning
Process Controllers, Chemical Engineering, 19 Sept. 83, pp 19-20
2. Bob Connel, Process Instrumentation Applications Manual, McGraw-Hill Book Co., 1996, pp 212-213
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