Trade of Electrician Motor Control COURSE NOTES - eCollege

FAS Electrical Course Notes – Module 2.4.2
Table of Contents
TABLE OF CONTENTS ..............................................................................................................................3
INTRODUCTION .........................................................................................................................................4
CIRCUIT SYMBOLS ...................................................................................................................................5
PANEL WIRING TECHNIQUES ...............................................................................................................6
TYPICAL MOTOR CONTROL INSTALLATION ................................................................................13
DEFINITIONS.............................................................................................................................................16
UNIT RELATED ETCI RULES................................................................................................................16
TERMINAL BLOCKS................................................................................................................................17
PUSHBUTTONS, SWITCHES AND INDICATORS ..............................................................................17
RELAYS.......................................................................................................................................................21
CONTACTORS ...........................................................................................................................................23
AUXILIARY CONTACT BLOCKS..........................................................................................................28
OVERLOAD PROTECTION ....................................................................................................................29
REASONS FOR OVERLOAD PROTECTION .......................................................................................32
MOTOR STARTER....................................................................................................................................33
DIRECT ON LINE STARTER ..................................................................................................................34
TYPES OF CONTROL...............................................................................................................................37
OVERLOAD SET UP .................................................................................................................................38
PROBLEM SOLVING TECHNIQUES ....................................................................................................41
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Revision 4. Feb 2009