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Unformatted text preview: ABSTRACT: The main objectives are to evaluate the parameters for the tuning PID control using Ziegler-Nichols method and to demonstrate the response of the system using level control mode. The offset was determined for the different proportional gain of 1, 2, and 3 to be equaled to 0.58, 0.38, and 0.28 respectively. The ultimate gain Kcu was found 4 with a period of 0.7317. The parameter was determined by two methods the continuous cycling method and the reaction curve. The PG was found by the cycling method 2, 1.8 and 2.4 for P, PI and PID respectively. The integral time constant was determined as 0.607 and 0.3659 for PI and PID respectively. Finally the derivative time constant for the PID was found 0.0914. Furthermore, the PG was found by curve method as 0.331, 0.2979 and 0.3972 for the P,PI and PID respectively. The integral time constant for the PI was 87.45 and for the PID was 53 where the derivative time constant of PID was 13.25. INTRODUCTION: Every chemical plant must have a control system to ensure the steady operation of the system. In order to control this system, the system parameter must be controlled and tuned. These parameters used to be tuned manually. However, development in the microelectronics and computer have made the monitoring and controlling of the manufacturing process relatively simple and low in cost. One way to tune the control parameter is by using Ziegler-Nicholas method by either continuous cycling method using flow rate control or process reaction curve using temperature control. THEORETICAL BACKGROUND: There are three basic feedback control mode which are proportional (P), integral (I) and derivative (D) control. • Proportional control mode The output of the controller is proportional to the error between The set point (SP) and the measured value (MV). Proportional Band, • Integral control mode This mode is often used to remove proportional offset, the controller Equation is, Where IAT is the integral action time, defined as the time taken for the integral action to duplicate the proportional action of the controller if the error remains constant during this period.controller if the error remains constant during this period....
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This note was uploaded on 12/28/2010 for the course CHEMICAL CHEM 409 taught by Professor Abdullahal-shammari during the Fall '08 term at King Fahd University of Petroleum & Minerals.
- Fall '08