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There’s a tremendous gap between the theory of electron flow, magnetic fields and that of repairing/troubleshooting electrical equipment and control circuits in the factory or plant. In this guide, I will try to avoid or at least minimize discussions on the theory and instead focus on showing you how to troubleshoot electrical equipment and control circuits. The guide helps to increase your knowledge and skills in improving equipment productivity whilst reducing maintenance costs. Reading this guide will help you identify, prevent and fix common electrical equipment and control circuits. The focus is 'outside the box'. The emphasis is on practical issues that go beyond typical electrical theory and focus on providing those that attend with the necessary toolbox of skills in solving electrical problems, ranging from control circuits to motors and variable speed drives. This guide focuses on the main issues of repair/troubleshooting electrical equipment and control circuits of today to enable you to walk onto your plant or facility to troubleshoot and fix problems as quickly as possible. This isn’t an advanced guide but one aimed at the fundamentals of troubleshooting systems.
This guide is very practical in its approach to troubleshooting -- the examples you’ll be shown are applicable to any industrial facility.
I hope that you will gain the following knowledge from this guide:
Typical people who will find this guide useful include:
A basic understanding of electrical theory as well as any problems you've encountered in the past is helpful; but a basic, review/ "refresher" is given at the beginning of this guide.
 Troubleshooting AC motors and starters
 How to troubleshoot variable-speed drives (VSDs)
[8, C] Low-voltage networks: Intro and Molded-case circuit breakers; Application + selective coordination; Earth-ground leakage protection