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1.0 DYNAMIC SYSTEM INTRODUCTION 1.1 System Introduction The theory of the automatic gate is very simple, when we press the open button, a signal is sent to the main circuitry board which then allows the current to pass through to the gates motor causing the motor to run and the gate open. Once the gate is fully open (depending on where the resistant beam is located) the motor stops running causing the gate to stop moving. And when the close button is pressed the same thing happens but this time the motor run in the opposite direction, therefore causing the gate close. Figure 1: This is the s tructure of the slider automatic gate An automatic control system is a preset closed-loop control system that requires no operator action. This as sumes the process remains in the normal range for the control system. An automatic control system has two process variables associated with it: a controlled variable and a manipulated variable. A  controlled variable is the process variable that is maintained at a specified value or within a specified range. In the previous example, the storage tank level is the controlled variable. A  manipulated variable is the process variable that is acted on by the control system to maintain the controlled variable at the specified value or within the specified range. In the previous example, the flow rate of the water supplied to the tank is the manipulated variable.

Control System Project 1

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