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Control Systems Theory

Instrumentation Earthing

S Bharadwaj Reddy
Earthing is the process of creating an alternative path for the flow of fault/excessive currents safely into the ground in the presence of minimal resistance or impedance. The primary purpose

Process Control Loop Testing

S Bharadwaj Reddy
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output. In other words, the process is perturbed (the highly technical

Identify Level Control Loop Tuning Problems

S Bharadwaj Reddy
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where considerable amount of vibration exists, but it seems to have

Process Control High Level Alarm Fault Analysis

S Bharadwaj Reddy
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation, in this sour water stripping tower unit (where sulfide-laden water

Compressor Emergency Shutdown Root Cause Analysis

S Bharadwaj Reddy
The compressor emergency shutdown system (ESD) has tripped the natural gas compressor off-line three times in the past 24 hours. Each time the operator goes to reset the compressor interlock,

Liquid Flow Control Loop Controller Action

S Bharadwaj Reddy
A liquid flow control loop consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and output an electronic signal corresponding to the flow. A flow

Difference between DCS & PLC Systems

S Bharadwaj Reddy
DCS stands for Distributed Control System and PLC stands for Programmable Logic Controller. Do you know the Difference between DCS and PLC Systems ? Difference between DCS & PLC Systems

BASICS OF TRIPS, INTERLOCKS, PERMISSIVES & SEQUENCES

S Bharadwaj Reddy
This post provides information about basics of Trip, Interlock, Permissive and Sequences which are regularly used in instrumentation control systems like ESD, DCS, PLC etc. Trip: The term Trip refers to an action that

Boiler Three Element Controller Philosophy

S Bharadwaj Reddy
A single element control system is one with just one control input, a two element control system is one with two control inputs, etc. A three-element boiler water level control

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