Relay Control System

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Relay Control System

Order Code: 52039

Introduction Most physical systems are nonlinear to some extent, however, for purpose of analysis and design these are taken as nearly linear. In a few systems nonlinear elements are deliberately introduced to get some specific advantage. One such...

SPECIFICATION

Introduction

Most physical systems are nonlinear to some extent, however, for purpose of analysis and design these are taken as nearly linear. In a few systems nonlinear elements are deliberately introduced to get some specific advantage. One such system is a relay control system, often referred to as bangbang or ON-OFF system. The controller in such a system is replaced by a power relay resulting in a substantial cost reduction. In the present unit a simulated second order system is controlled by an electronic relay. Apart from a study of the relay characteristics the experiment introduces the concept of Describing Function. Finally the phase plane method of analysis is covered in detail where the switching trajectories can be displayed on an X-Y oscilloscope. Figures below give the block diagram of the feedback system and the characteristics of the simulated relay.

The accompanying literature covers a brief treatment of the nonlinear system analysis through Describing Function and Phase Plane methods.Steps for conducting various experiments are described along with sample test results.

Features and Specifications

Simulated electronic relay using high speed IC’s
Simulated 2nd order linear plant. Facility for displaying x and x signals
Dead zone variable from 0-600mV (approx.)
Hysteresis variable from 0-500mV (approx.)
Built-in signal sources – sine and square Amplitude : 0-1V (min.) Variable Frequency: 10, 20, 40, 80, 100, 200, 400, 800 and 1000Hz
IC regulated internal power supplies *220V±10%, 50Hz mains

operation * Literature and patch cords included