CHAPTER 1

INTRODUCTION TO CONTROL SYSTEM

1.1 Describe an electrical, pneumatic and hydraulic control. 

1.1.1 Names the common application in electrical, pneumatic and hydraulic control.

1.2 Identify general terms used in process control. 

1.2.1 Define process variables, dynamic variables, servo control, feedback control, process, regulation, set point, interference and error, controller, measurement elements and so on.

1.3 Identify basic process control system:

1.3.1 Recognize the basic elements for process control (example level control in tank, temperature control etc). 

1.3.2 Explain the process of measurement, evaluation and control elements from 1.3.1.

1.3.3 Draw and label block diagram of basic elements of process control.

1.3.4 Explain the purpose and use of open loop and closed loop block diagrams.

1.3.5 Differentiate open loop from closed loop process control by identifying negative and positive feedback.

1.3.6 Build examples of open loop and closed loop process control with the aid of block diagrams.

1.3.7 Define automatic control system.

1.3.8 Explain the purpose, advantages and disadvantages of automatic control system usage.

1.4 Identify method of setting up a process control loop system.

1.4.1 Describe the need for a system control diagram.

1.4.2 Explain with the aid of diagrams:

(a) Free single variable loop.

(b) Interacting single variable loop.

(c) Multi -variable loop.

1.4.3 Identify the need of a cascade control system.

1.4.4 Explain the most important characteristics of a cascade control system with the aid of block diagrams.

1.4.5 Explain the necessity of quality in control system.

1.4.6 Define quality in terms of loop interference,stability, minimal error and minimal duration.

1.4.7 Analyze over-damped, critically damped and under-damped sketching.