Design of flow control system based on PLC armfield pressure control module in chemical engineering laboratory

Abstract

A control system in industry has an important role to increase the effectiveness and efficiency in manufacture process. Laboratory of Chemical Engineering Department in State Polytechnic of Malang has several tools to develop competence in automation process control system, one of them is the pressure control module. This module aims to control the rate of compressed air flow coming out from the compressor. Nonetheless, the control system used is still analog. In order to improve the performance of module, rejuvenation has created by PLC that is optimized by PID controller method. This rejuvenation process is carried out in several stages, such as designing PLC hardware and software then testing and analyzing the system. There are four stages in testing and analyzing the system, both testing and analyzing the open loop system without tank and with tank, PID close loop with tank and without tank. Based on the results, this study indicated that the close loop system with PID has a better response than open loop system, which is able to improve the errors and transient responses so that the system is more stable and fit with set point value. The PID parameter that produces a good response when used in the pressure control module is Kp = 100 Ki = 1 and Kd = 0. This parameter is able to produce a system measurement value of 80% with error of 0%.