Conduct the following pressure lab:Pressure LabThis lab is designed to utilize a pneumatic...

Conduct the following pressure lab:

Pressure Lab

This lab is designed to utilize a pneumatic controller on a simulator. (Note: A bench unit, using air for the process, could be used as well.) The instructor will change the tuning constants on the trainer controllers to demonstrate how a process system responds when the controller tuning constants are correct and incorrect.

Procedure

Note: If a controller begins to act up it is probably because of a load change, a drastic upset, or someone has adjusted the tuning constants.

a. The instructor will demonstrate how a controller reacts to a load change or upset with the proper tuning constants, and will show how a controller reacts to a load change or upset when the tuning constants are incorrect.

Note 1: If a drastic load change occurs, the tuning constants of a controller should be changed.

Note 2: Some electronic controllers are self-tuning, such as Foxboro 761 and Taylor Mod 30.

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b. The instructor will lower the gain to .5.

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c. Raise the flow to 9 units and watch the process reaction, then discuss controller action with the instructor.

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d. Lower the flow back to 4 units and let process stabilize.

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e. The instructor will set gain back to normal and let process stabilize.

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f. The instructor will then raise the gain to High.

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g. Raise the flow to 9 units and watch the LRC-100 reaction, then discuss the controller action with the instructor.

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h. Lower the flow back to 4 units and let process stabilize.

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i. The instructor will set gain back to normal and let process stabilize, then lower reset to .5.

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j. Raise flow to 9 units and watch process reaction, then discuss controller action with the instructor.

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k. The instructor will lower flow back to 4 units and let process stabilize, then set reset back to normal and let process stabilize.

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l. The instructor will raise reset to 8.

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m. Raise flow to 9 units and watch the process reaction, then discuss the controller action with the instructor.

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n. The instructor will lower the flow back to 4 units and let process stabilize, then set reset back to normal and let process stabilize.