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PID Controller Action : Directing Acting & Reverse Acting

S Bharadwaj Reddy
Air to open/close valves and direction of control action Control valves come in two sorts: air to open; and air to close. Air to open valves are normally held closed by the

What we need to Know before Tune a PID Controller ?

S Bharadwaj Reddy
We know the benefits of robust PID control Tuning. Increased productivity, decreased equipment strain, and increased process safety are some of the advantages touted of proper PID tuning. What is

PID Controller Functions

S Bharadwaj Reddy
For any PID controller to be practical, it must be able to do more than just implement the PID equation. This article explains some of the basic features found on

PID Controller Response with different Input Signals

S Bharadwaj Reddy
A very helpful method for understanding the operation of proportional, integral, and derivative control terms is to analyze their respective responses to the same input conditions over time. This section

Overview of PID Control terms

S Bharadwaj Reddy
PID control can be a confusing concept to understand. Here, a brief summary of each term within PID (P. I, and D) is presented for your learning benefit. Proportional control

PID Controller Loop Tuning Questions and Answers – Part 1

S Bharadwaj Reddy
This article provides PID controller loop tuning conditions for different conditions to analyze Process Variable, Set Point and Controller Output trends. PID Controller Loop Tuning Questions and Answers 1. Examine this

How to Select the Right Type of Controller

S Bharadwaj Reddy
Distinguishing Characteristics  P-only Accelerates the response of controlled process Produces offset except for integrating (1/s) processes PI Eliminates offset Usually higher maximum deviations than P-only Sluggish, long oscillating responses Increased

How a Process Control Loop Works

S Bharadwaj Reddy
A typical process control system is shown in Figure. Assume the physical variable to be controlled is the temperature. Basically Industrial process control loop consists of sensors, transmitters, Control systems (PLC/DCS),

ON-OFF Controller Principle

S Bharadwaj Reddy
On-Off control is the simplest form of feedback control. An on-off controller simply drives the manipulated variable from fully closed to fully open depending on the position of the controlled

Derivative Controller Principle

S Bharadwaj Reddy
RATE OR DERIVATIVE ACTION Consider a control system subjected to a disturbance, which causes the error to increase in a ramped manner. Proportional control would respond to this ramped error with a

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