FOREWORD
This book is written with the thought of being a general guide for people working with
softstarter applications but also for those just interested in learning more about this type
of starting method. It doesn’t matter if you are an expert or novice, hopefully you will find
some interesting and useful information either by reading from cover to cover or just the
chapters of interest.
The index at the end of the book can be used to simplify your search.The content of this book is very much based on the 20 years of experience we have withinABB of developing, manufacturing and selling low voltage softstarters.
The book is not a complete technical guide or manual for all type of ABB Softstarters that
may exist on the market. It is a complement to the technical catalogues and brochures we
have for our products and will give a general picture of what to think about when working
with softstarters.
More information about softstarters as well as other ABB products is available on www.abb.comAll advice given in this book is only general and every single application must be handled as a specific case.
About Motors
Modern electrical motors are available in many different forms, such as single phase
motors, three-phase motors, brake motors, synchronous motors, asynchronous motors,
special customised motors, two speed motors, three speed motors, and so on, all with
their own performance and characteristics.
For each type of motor there are many different mounting arrangements, for example
foot mounting, flange mounting or combined foot and flange mounting. The cooling
method can also differ very much, from the simplest motor with free self-circulation of
air to a more complex motor with totally enclosed air-water cooling with an interchangeable cassette type of cooler.
To ensure a long lifetime for the motor it is important to keep it with the correct
degree of protection when under heavy-duty conditions in a servere environment.
The two letters IP (International Protection) state the degree of protection followed
by two digits, the first of which indicates the degree of protection against contact
and penetration of solid objects, whereas the second states the motor’s degree of
protection against water.
The end of the motor is defined in the IEC-standard as follows:
• The D-end is normally the drive end of the motor.
• The N-end is normally the non-drive end of the motor.
About Motors
Note that in this handbook we will focus on asynchronous motors only
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