Che 185 process control and dynamics
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CHE 185 – PROCESS CONTROL AND DYNAMICS. WORKSHOP 2. P-only control of tank level. OBJECTIVES: 1. Understand the concept of closed loop feedback control (in contrast to open loop). 2. See the effects of controller gain on its performance (Define performance) . P-only control of tank level.

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CHE 185 – PROCESS CONTROL AND DYNAMICS

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Che 185 process control and dynamics

CHE 185 – PROCESS CONTROL AND DYNAMICS

WORKSHOP 2


P only control of tank level

P-only control of tank level

  • OBJECTIVES:

    • 1. Understand the concept of closed loop feedback control (in contrast to open loop).

    • 2. See the effects of controller gain on its performance (Define performance)

      .


P only control of tank level1

P-only control of tank level

  • OBJECTIVES:

    • 3. Realize the difference between set point tracking and disturbance rejection controls (show response curves for each)

    • 4. Predict the steady state error of the P-only control, and understand the existence of it for P-only control


P only control of tank level2

P-only control of tank level

  • OBJECTIVES:

    • 5. Understand what proportional band is.

  • overall objective is to maintain inventory; tank-filling operation is to maintain constant level; transmitter, control valve, and controller are the devices to achieve that objective.


P only control of tank level worksheet

P-Only Control of Tank Level Worksheet


P only control of tank level worksheet1

P-Only Control of Tank Level Worksheet


P only control of tank level worksheet2

P-Only Control of Tank Level Worksheet


Typical results

TYPICAL RESULTS

  • Fit a FOPDT dynamic model to the CO to PV (cause and effect) step test data CO = controller output; PV = measured process variable (level in the tank)


Typical results1

TYPICAL RESULTS

  • Fit a FOPDT dynamic model to the CO to PV


Typical results2

TYPICAL RESULTS

  • 60%  68% step in Controller Output


Typical results3

TYPICAL RESULTS

  • 60%  68% step in Controller Output


Typical results4

TYPICAL RESULTS

  • 60%  68% step in Controller Output


Typical results5

TYPICAL RESULTS

  • ACTIVATING THE CONTROLLER - Click the level controller icon (LC), switch from Manual Mode to PID, enter your SP, CObias and Kc values. Switch integral to ‘off: Integral Mode’. Derivative Mode should also be off.


Typical results6

TYPICAL RESULTS


Typical results7

TYPICAL RESULTS


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