ac_drives.pdf

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Table of Contents

Introduction ..............................................................................2

Siemens AC Drives and Totally Integrated Automation .............4

Mechanical Basics ....................................................................6

AC Motor Construction ........................................................... 15

Developing A Rotating Magnetic Field.................................... 19

Rotor Construction .................................................................22

NEMA Rotor Characteristics...................................................26

Electrical Components Of A Motor.........................................29

Voltage And Frequency ...........................................................31

Basic AC Drives ......................................................................37

Siemens MICROMASTER ......................................................46

Siemens MASTERDRIVE........................................................66

MASTERDRIVE Compact, Chassis, and Cabinet Units........... 74

MASTERDRIVE Compact Plus................................................85

Parameters and Function Blocks ............................................90

Applications ............................................................................96

Constant Torque Applications..................................................97

Variable Torque Applications.................................................. 101

Constant Horsepower Applications ...................................... 105

Multimotor Applications........................................................ 107

Review Answers................................................................... 109

Final Exam ............................................................................ 110

1

Introduction

Welcome to another course in the STEP 2000 series, S iemens

T echnical E ducation P rogram, designed to prepare our

distributors to sell Siemens Energy & Automation products

more effectively. This course covers Basics of AC Drives and

related products.

Upon completion of Basics of AC Drives you should be able to:

• Explain the concept of force, inertia, speed, and torque

• Explain the difference between work and power

• Describe the construction of a squirrel cage AC motor

• Identify the nameplate information of an AC motor

necessary for application to an AC Drive

• Describe the operation of a three-phase rotating magnetic

field

• Calculate synchronous speed, slip, and rotor speed

• Describe the relationship between V/Hz, torque, and

current

• Describe the basic construction and operation of a PWM

type AC drive

• Describe features and operation of the Siemens

MICROMASTER and MASTERDRIVE VC

• Describe the characteristics of constant torque, constant

horsepower, and variable torque applications

2

This knowledge will help you better understand customer

applications. In addition, you will be able to describe products

to customers and determine important differences between

products. You should complete Basics of Electricity before

attempting Basics of AC Drives . An understanding of many of

the concepts covered in Basics of Electricity is required for

Basics of AC Drives .

If you are an employee of a Siemens Energy & Automation

authorized distributor, fill out the final exam tear-out card and

mail in the card. We will mail you a certificate of completion if

you score a passing grade. Good luck with your efforts.

SIMOVERT is a registered trademark of Siemens AG.

National Electrical Manufacturers Association is located

at 2101 L. Street, N.W., Washington, D.C. 20037. The

abbreviation “NEMA” is understood to mean National Electrical

Manufacturers Association.

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Siemens AC Drives andTotally Integrated

Automation

This course focuses on several Siemens AC drives, which

include the MICROMASTER and MASTERDRIVE VC, which are

important elements of the TIA strategy.

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Totally Integrated Totally Integrated Automation (TIA) is more than a concept. TIA

Automation is a strategy developed by Siemens that emphasizes the

seamless integration of automation products. The TIA strategy

incorporates a wide variety of automation products such

as programmable controllers, computer numerical controls,

Human Machine Interfaces (HMI), and drives which are easily

connected via open protocol networks.

PROFIBUS DP An important aspect of TIA is the ability of devices to

communicate with each other over various network protocols,

such as Ethernet and PROFIBUS DP. PROFIBUS DP is an

open bus standard for a wide range of applications in various

manufacturing and automation applications. Siemens AC drives

can easily communicate with other control devices such as

programmable logic controllers (PLCs) and personal computers

(PCs) through the PROFIBUS-DP communication system and

other various protocols.

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