Formula Sheet 1

Formula Sheet 1 - Control Loop Block Diagram Following the...

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Control Loop Block Diagram: Following the diagram of Fig. 1.4, a sensor measures the measured process variable and transmits, or feeds back, the signal to the controller. This measurement feedback signal is subtracted from the set point to obtain the controller error . The error is used by the controller to compute a controller output signal. The signal causes a change in the mechanical final control element , which in turn causes a change in the manipulated process variable . Both these figures depict a closed loop system based on negative feedback , because the controller works to automatically counteract or oppose any drift in the measured process variable. It is good practice to adjust controller tuning parameters while in this manual, or open loop mode . Sensors to Measure : temperature, pressure, pressure drop, level, flow, density, concentration Final Control Elements : solenoid, valve, variable speed pump or compressor, heater or cooler
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FOPDT Parameters: Process Gain, KP , From Step Test Data: The steady state process gain describes how much the measured process variable, y ( t ), changes in response to changes in the controller output, u ( t ). Overall Time Constant,
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This note was uploaded on 03/31/2008 for the course CHE 3015 taught by Professor Rmd during the Spring '08 term at Virginia Tech.

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Formula Sheet 1 - Control Loop Block Diagram Following the...

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