Z Learning 101 Fundamentals Of Motor unit Contro Dissertation

101 PRINCIPLES SERIES

LEARNING MODULE 19:

STARTERS AND CONTACTORS

Cutler-Hammer

STARTERS

MEET

Welcome to Module nineteen, which is regarding starters, equipment that control the use of electric power to gear, usually a motor.

While the term implies, newbies " start” motors. They can also end them, change them, increase them, and protect them.

Beginners are made from two building blocks, providers and overburden protection: •

Contactors control the electric energy to the motor unit. Their function is to frequently establish and interrupt an electrical power signal.

•

Overload Protection protects motors coming from drawing a lot of current and overheating, coming from literally " burning away. ”

=

STARTER

&

CONTROLLER

EXCESS PROTECTION

NUMBER 1 . A STARTER IS MADE UP OF A CONTROLLER

(MOST OFTEN A CONTACTOR) AND OVERBURDEN PROTECTION

Just like the other themes in this series, this one reveals small , manageable sections of fresh material accompanied by a series of questions about that material. Study the material carefully, then simply answer the questions with out referring returning to what get just browse.

You are the best judge showing how well you grasp the material. Assessment the material as often as you think necessary. The main thing is establishing a great foundation to build on as you move via topic to topic and module to module. An email on Font

Styles

Tips are in bold.

Glossary terms happen to be underlined and italicized the very first time they appear.

Viewing the

Glossary

You may look at definitions of glossary items by hitting terms and words which might be underlined and italicized inside the text. You can even browse the Glossary by simply clicking the Glossary bookmark inside the left-hand perimeter.

1

BEGINNERS

WHAT YOU

LEARN

We'll start with talking about the inspiration of a beginner: the contactor and overload protection. We all will then consider with a discussion on newbies. Here are the topics that we will cover:

Section Title

•

3

•

Knife Blade Switch

3

•

Manual Controller

5

•

Permanent magnetic Contactor

5

•

Contactor Components

six

•

How the Contactor Operates

6

•

Contact Lifestyle

8

•

Review you

•

Overburden Protection

9

10

•

How Motor Work

10

•

Precisely what is an Excess?

12

•

Overload Relay

13

•

The Eutectic Overload Relay

13

•

The Bimetallic Overload Relay

15

•

The Sturdy State Overburden Relay

sixteen

•

Stumbling

17

•

Overload Electrical relays in Action

17

•

Assessment 2

18

•

The Starter

nineteen

•

2

The Contactor

Page Amount

•

Manual Starter

20

•

Magnet Motor Starter

21

•

Starter Circuitry

22

•

Features of Motor Starters

twenty-five

•

Types of Motor Starters

25

•

Criteria and Ratings

26

Supporting the Customer

twenty seven

•

Meeting with the Customer

27

•

NEMA or IEC?

28

•

Checking the Electric motor Nameplate

twenty-eight

•

Modifications

29

•

Review several

30

•

Glossary

23

•

Assessment Answers

34

STARTERS

THE

CONTACTOR

A contactor may stand itself as a electric power control device, or perhaps as part of a starter. Contactors are used in applications ranging from the light switch to one of the most complex, automatic industrial tools. Contactors are used by electric equipment that may be frequently switched off and on (opening and concluding the circuit), such as lighting, heaters, and motors.

No matter what application, the function in the contactor is usually the same: for making and break all power lines running towards a load. Or perhaps, as identified by NEMA, to repeatedly establish and interrupt any power outlet.

Knife Cutting tool

Switches

The first device used to quit and start electric motors was obviously a simple cutting knife blade move. This was a lever that might drop a strip of metal upon a speak to to make the electric circuit. In the late 1800's, " throwing the switch” meant exactly that – someone was required to stand...



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