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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 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 • 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 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.
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 RESULTS • Fit a FOPDT dynamic model to the CO to PV
TYPICAL RESULTS • 60% 68% step in Controller Output
TYPICAL RESULTS • 60% 68% step in Controller Output
TYPICAL RESULTS • 60% 68% step in Controller Output
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.
