Control System
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BASIC CONTROL PRINCIPLES
INTRODUCTION Control of the processes in the plant is an essential part of the plant operation.The level of the boiler…
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Working of control valve
Introduction The control valve is a controlled device that regulates the flow of a liquid or gas in a system.…
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Different components of a control loop
What is control loop? A Control loop is the fundamental building block of the industrial control system or industrial automation.…
Read More » Basics of PID controller (Proportional – Integral – Derivative)
PID (Proportional – Integral – Derivative ) Controller Proportional The proportional term makes the current error signal multiplied with a…
Read More »Override Control
Override It is sometimes necessary to limit a variable in order to maintain safe operation or protect process equipment. If…
Read More »Feedforward Control System
Feedforward A Feedforward control system measures a disturbance in variable, predicts its effect on the process and applies corrective action.…
Read More »Cascade Control System
Cascade In cascade control system two controllers are cascaded to each other as shown in the diagram below. Primary…
Read More »Ratio Control
Ratio Control In Ratio Control, the controlled variable is the ratio of two measured variables. Control is effected by adjusting…
Read More »Common Control Loops
Common Control Loop 1.Flow Liquid flow processes are fast, typically 0.5 sec response or less. Gas flow is…
Read More »Derivative Or Rate Control
Derivative Control Derivative control (also called rate control) responds to the rate of change of the controlled variable. For example,…
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