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3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control

Princess Sumaya Univ. Electronic Engineering Dept. 3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control. Dr. Bassam Kahhaleh. Introduction to Process Control. Objective Introduce the overall process-control loop, its function, and its description.

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3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control

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  1. Princess Sumaya Univ.Electronic Engineering Dept. 3441Industrial Instruments 1Chapter 1Introduction to Process Control Dr. Bassam Kahhaleh

  2. 3441 - Industrial Instruments 1 Introduction to Process Control Objective Introduce the overall process-control loop, its function, and its description.

  3. 3441 - Industrial Instruments 1 Introduction to Process Control Process-Control Principles The Process

  4. 3441 - Industrial Instruments 1 Introduction to Process Control Process-Control Principles Human-Aided Control

  5. 3441 - Industrial Instruments 1 Introduction to Process Control Process-Control Principles Automatic Control

  6. 3441 - Industrial Instruments 1 Introduction to Process Control Process-Control Block Diagram Control Element p e = r - b Process r ∑ Controller − b Measurement

  7. 3441 - Industrial Instruments 1 Introduction to Process Control Control System Evaluation • Stability Does the system become unstable, especially after reacting to a disturbance or other changes? • Steady-State Regulation • Transient Regulation

  8. 3441 - Industrial Instruments 1 Introduction to Process Control Control System Evaluation • Evaluation Criteria • Damped Response • Cyclic Response

  9. 3441 - Industrial Instruments 1 Introduction to Process Control Analog & Digital Processing • Data Representation • Analog Data • Digital Data (Binary) • Data Conversion • ADC • DAC • Resolution & Speed

  10. 3441 - Industrial Instruments 1 Introduction to Process Control ON/OFF Control • Control Element is either ON or OFF • Relays • Mechanical • Solid-State

  11. 3441 - Industrial Instruments 1 Introduction to Process Control ON/OFF Control • Relays • Mechanical

  12. 3441 - Industrial Instruments 1 Introduction to Process Control ON/OFF Control • Relays • Mechanical

  13. 3441 - Industrial Instruments 1 Introduction to Process Control ON/OFF Control • Relays • Mechanical

  14. 3441 - Industrial Instruments 1 Introduction to Process Control ON/OFF Control

  15. 3441 - Industrial Instruments 1 Introduction to Process Control Analog Control VQ Controller Heater Q Ve = Vr - VT Oven Vr ∑ T Error detector − VT Measurement

  16. 3441 - Industrial Instruments 1 Introduction to Process Control Digital Control • Supervisory Control VQ Heater Q Ve = Vr - VT Controller ∑ Oven Error detector T − VT Vr Measurement ADC Computer DAC

  17. 3441 - Industrial Instruments 1 Introduction to Process Control Digital Control • Direct Digital Control (DDC) VQ Heater Q DAC NQ Oven Computer T NT ADC Measurement VT

  18. 3441 - Industrial Instruments 1 Introduction to Process Control Programmable Logic Controllers (PLC) • Inputs & Outputs are AC level L L PLC N N

  19. 3441 - Industrial Instruments 1 Introduction to Process Control Sensor Time Response • First-Order Response b (t ) = bi+(bf– bi )[1–e– t /] • Second-Order Response R (t )  Ro e –t sin (2  fnt )

  20. 3441 - Industrial Instruments 1 Introduction to Process Control End of Chapter 1

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