Practical Troubleshooting of Electrical Equipment and Control Circuits

by Brown; Rawtani; Patil

• ISBN13: 9780750662789
• ISBN10: 0750662786
• Format: Paperback
• Copyright: 2004-12-13
• Publisher: Elsevier Science

Summary

There is a large gap between what you learn in college and the practical knowhow demanded in the working environment, running and maintaining electrical equipment and control circuits. Practical Troubleshooting Of Electrical Equipment and Control Circuits focuses on the hands-on knowledge and rules-of-thumb that will help engineers and employers by increasing knowledge and skills, leading to improved equipment productivity and reduced maintenance costs. This book will help engineers and technicians to identify, prevent and fix common electrical equipment and control circuits. The emphasis is on practical issues that go beyond typical electrical principles, providing a tool-kit of skills in solving electrical problems, ranging from control circuits to motors and variable speed drives. The examples in the book are designed to be applicable to any facility.

Table of Contents

Preface	vii
Basic principles	1	(23)
Introduction	1	(11)
Basic principles of electrical machines	12	(7)
AC power systems	19	(3)
Meters used in troubleshooting	22	(2)
Devices, symbols, and circuits	24	(18)
Devices and symbols	24	(1)
Electrical circuits	24	(4)
Reading and understanding electrical drawings	28	(8)
Reading and understanding ladder logic	36	(3)
Wires and terminal numbering	39	(3)
Basic troubleshooting principles	42	(26)
Introduction	42	(1)
Basic principles in using a drawing and meter in troubleshooting circuits	43	(1)
Checks for circuit continuity with disconnected supply	44	(3)
Checks for circuit continuity with live supply	47	(1)
Tests and methods	48	(1)
Testing devices	49	(12)
Circuits	61	(1)
Accurate wiring of circuits and connections	62	(4)
Tests for installation and troubleshooting	66	(2)
Troubleshooting AC motors and starters	68	(44)
Introduction	68	(1)
Fundamentals of three-phase AC motors	68	(10)
Fundamental of single-phase AC motors	78	(3)
DC motors	81	(4)
Motor enclosures	85	(1)
Motor terminal identification and connection diagram	86	(2)
Motor rating and insulation types	88	(2)
Operating a motor for forward and reverse operation	90	(1)
Motor braking methods	91	(9)
Motor testingt	100	(6)
Measurements used for a motor	106	(1)
Motor failures and methods to extend its life	106	(1)
Motor control trouble--remedy table	107	(2)
Motor starter check chart	109	(3)
Switches, circuit breakers and switchboards	112	(9)
Introduction	112	(1)
Switches and circuit breakers	112	(6)
Overloads and fault protection	118	(1)
Switchboards	119	(1)
Motor control center	120	(1)
Troubleshooting variable speed drives	121	(52)
The need for VSDs	121	(1)
Basic VSD	121	(2)
Power electronic components	123	(9)
Electrical VSDs	132	(3)
Power electronic rectifiers (AC/DC converters)	135	(14)
Gate-commutated inverters (DC/AC converters)	149	(8)
Overall protection and diagnostics	157	(3)
Installations and commissioning	160	(3)
Power supply connections and earthing requirements	163	(3)
Precautions for start/stop control of AC drives	166	(3)
Control wiring for VSDS	169	(1)
Commissioning VSDs	170	(3)
Troubleshooting control circuits	173	(22)
Basic control circuits	173	(4)
Ladder logic circuits	177	(1)
Two-wire control	178	(1)
Three-wire control - start/stop	179	(1)
Jog/inch circuits	180	(1)
Sequence start and stop	181	(2)
Automatic sequence starting	183	(1)
Reversing circuit	183	(4)
Plug stop and anti-plug circuits	187	(2)
Two-speed motor control	189	(1)
Overload protection	189	(1)
Troubleshooting examples	190	(2)
Troubleshooting strategies	192	(2)
Ladder logic design exercise	194	(1)
Appendix A: Units and abbreviations	195	(1)
Appendix B: Troubleshooting	196	(17)
Appendix C: Low-voltage networks	213	(19)
Index	232