Siemens SIRIUS 3RW44 User guide

Table of contents
Important notes
Introduction 1
Configuration instructions 2
Installation, connection and
branch construction 3
Display, controls and device
interfaces 4
Commissioning 5
Device functions 6
Diagnostics and messages 7
Circuit examples 8
General technical data 9
Appendix
Index
SIRIUS
Issue 06/2005
GWA 4NEB 535 2195-02 DS 01
Order No.: 3ZX1012-0RW44-1AC1
3RW44
System manual
Soft starter

Siemens AG
Automation & Drives
P.O. box 4848, 90327 Nuremberg, Germany
Siemens Aktiengesellschaft
©Siemens AG 2004
Subject to technical changes
Copyright Siemens AG 2004. All rights reserved.
This document shall not be transmitted or reproduced, nor shall its
contents be exploited or disclosed to third persons without prior written
consent from Siemens. Infringements will be subject to damage claims.
All rights reserved, in particular in case of a patent grant of utility model
registration.
Disclaimer of liability
Although we have carefully checked the contents of this publication for
conformity with the hardware and software described, we cannot
guarantee complete conformity since errors cannot be excluded. The
information provided in this manual is checked at regular intervals and
any corrections which might become necessary will be included in the
next editions.
Safety instructions
This document contains instructions you are strongly advised to observe in order to guarantee your personal safety
and to avoid damage to property. The instructions on your personal safety are marked by a warning triangle, notes on
risk of property damage have no warning triangle. Depending on the degree of risk, the instructions are presented as
follows.
Danger
means that death or serious physical injuries will follow if you do not take the appropriate precautionary measures.
Warning
means that death or serious physical injuries may follow if you do not take the appropriate precautionary measures.
Caution
with a warning triangle means that minor physical injuries may follow if you do not take the appropriate
precautionary measures.
Caution
without a warning triangle means that damage to property may follow if you do not take the appropriate
precautionary measures.
Notice
means that an undesired result or condition may occur if the corresponding instruction is not observed.
Where several degrees of risk are present at the same time, the instruction for the highest degree of risk is used. If an
instruction with a warning triangle contains a warning against personal injury, the same instruction may also contain an
additional warning against damage to property.
Qualified personnel
The associated device/system must only be configured and used in conjunction with this documentation. Devices/
systems must be commissioned and operated by qualified personnel only. Qualified personnel according to the
safety instructions of this documentation are persons authorized to commission, ground, and mark devices, systems
and current circuits according to the relevant safety standards.
Notes on proper use
Please observe the following:
Warning
The device may only be used for applications specified in the catalog and the technical descriptions. Furthermore it
may only be used in combination with third-party devices and components recommended or approved by Siemens.
Faultless and safe operation is only ensured if the product is transported, stored, mounted and installed properly
and if operation and maintenance is carried out conscientiously.
Trademarks
All names carrying the industrial property mark ® are registered trademarks of Siemens AG. The other designations in
this publication may be trademarks whose use by third parties for their own purposes may infringe the rights of the
owners.

SIEMENS Table of Contents
SIRIUS 3RW44 soft starter i
GWA 4NEB 535 2195-02 DS 01
Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 Physical basics of the 3-phase asynchronous motor and mode of operation of the soft starter . . 1-2
1.1.1 3-phase asynchronous motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.1.2 Operating mode of the SIRIUS 3RW44 electronic soft starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.2 Application and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1.3 Boundary conditions for storage and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
2 Configuration instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.1 Serial PC interface RS 232 and Softstarter ES parameterizing and operating software. . . . . . . . . . 2-2
2.1.2 Win-SOFTSTARTER selection and simulation program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.3 Training course for SIRIUS soft starters (SD-SIRIUSO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Normal or heavy starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 Example applications for normal starting (Class 10). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Example applications for heavy starting (Class 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.3 Example applications for heaviest starting (Class 30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.3 On-time and switching frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.4 Installation height and ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.5 Factory setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3 Installation, connection and branch layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Installing the soft starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.2 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.3 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4 Mounting dimensions and clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2 Branch layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2 Soft starters in standard circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3.2.3 Soft starter in inside delta circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
3.2.4 Soft starter with contactor disconnector (main contactor) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3.3 Protection of the soft starter against short circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.4 Capacitors for power factor improvement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.5 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.5.1 Control and auxiliary current connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.5.2 Main current connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.5.3 Conductor cross-sections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
4 Display, controls and device interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Display and controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 Device interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Local device interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.2 Profibus interface (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
5 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1 Menu structure, navigation, changing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.1.1 Menu structure and navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.1.2 Changing parameters: for example motor data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Table of contents SIEMENS
ii SIRIUS 3RW44 soft starter
GWA 4NEB 535 2195-02 DS 01
5.2 Switching on for the first time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.2.1 Quick start menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.3 User-specific commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.3.1 “Settings” main menu item . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5.4 Making settings in the selected parameter set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.4.1 Select parameter set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.4.2 Entering motor data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.3 Determining the starting mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
5.4.4 Determining the stopping mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
5.4.5 Setting slow speed parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
5.4.6 Determining current limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
5.4.7 Parameterization of the inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
5.4.8 Parameterization of the outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
5.4.9 Selection of motor protection settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22
5.4.10 Selection of display settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
5.4.11 Determining the protective functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
5.4.12 Determining the names on the device display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
5.4.13 Saving options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25
5.5 Other device functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
5.5.1 Measured value display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
5.5.2 Status display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
5.5.3 Motor control (assign control priority) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
5.5.4 Safety (define user level, parameterization protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
6 Device functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Various parameter sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 Starting modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.2.1 Voltage ramp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.2.2 Torque control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.2.3 Breakaway pulse in combination with voltage ramp or torque control starting mode . . . . . . . . . . . 6-7
6.2.4 Current limiting in combination with voltage ramp or torque control starting mode . . . . . . . . . . . . 6-9
6.2.5 Starting mode: direct on-line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.2.6 Starting mode: motor heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.3 Stopping modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
6.3.1 Coasting down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
6.3.2 Torque control and pump stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
6.3.3 DC braking / combined braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
6.4 Slow speed function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
6.5 Current limit values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
6.6 Motor protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6.7 Inherent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
7 Diagnostics and messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 Diagnostics, messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.1 Status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.2 Warnings and group errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.3 Device errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
8 Circuit examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1 Connection examples for main and control circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.1.1 3RW44 in a standard circuit with control via keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.1.2 3RW44 in a standard circuit with line contactor and control via PLC . . . . . . . . . . . . . . . . . . . . . . . . 8-3

SIEMENS Table of Contents
SIRIUS 3RW44 soft starter iii
GWA 4NEB 535 2195-02 DS 01
8.1.3 3RW44 in a standard circuit with DC braking3) stopping function for device types
3RW44 22 to 3RW44 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
8.1.4 3RW44 in a standard circuit with DC braking3) stopping function for device types
3RW44 26 to 3RW44 47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5
8.1.5 3RW44 in an inside delta circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6
8.1.6 3RW44 in a standard circuit and controlled like a contactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-7
8.1.7 3RW44 in a standard circuit with soft start/stop and additional slow speed function
in both directions of rotation with one parameter set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8
8.1.8 3RW 44 in a standard circuit with reversing operation via main contactors with one parameter set 8-9
9 General technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1 Menu structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
9.2 Transport and storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
9.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
9.3.1 Selection and ordering data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
9.3.2 Technical data power component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-7
9.3.3 Technical data control section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
9.3.4 Conductor cross-sections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
9.3.5 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14
9.3.6 Branch component layout (standard circuit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-15
9.3.7 Branch component layout (inside delta circuit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-16
9.3.8 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-17
9.4 Tripping characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18
9.4.1 Motor protection tripping characteristics: 3RW44 with symmetry . . . . . . . . . . . . . . . . . . . . . . . . 9-18
9.4.2 Motor protection tripping characteristics: 3RW44 with asymmetry . . . . . . . . . . . . . . . . . . . . . . . 9-18
9.5 Dimension drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Index-1

Table of contents SIEMENS
iv SIRIUS 3RW44 soft starter
GWA 4NEB 535 2195-02 DS 01

Important notes
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 v
Objective of this manual
This manual contains basics and tips on the application of SIRIUS 3RW44 soft
starters. The SIRIUS 3RW44 soft starter is an electronic motor control device for
optimized starting and stopping of 3-phase asynchronous motors.
The manual describes all the SIRIUS 3RW44 soft starter functions.
Ta r g e t g r o u p
The manual is aimed at all users who deal with
• commissioning
• service and maintenance
• planning and configuration of plants
Required basic knowledge
General knowledge in the field of general electrical engineering is required for
understanding this manual.
Validity
This manual is valid for SIRIUS 3RW44 soft starters. It contains a description of
the components that are valid at the time of publication of this manual. We
reserve the right to include an updated product information leaflet with new
components and new component versions.
Definitions
If the short form 3RW44 is used in the text, it refers to the SIRIUS 3RW44 soft
starter.
Standards and approvals
The SIRIUS 3RW44 soft starter complies to the IEC/EN 60947-4-2 standard.
Important notes

Important notes
SIRIUS 3RW44 manual
vi GWA 4NEB 535 2195-02 DS 01
Disclaimer of liability
The manufacturer of the system or machine is responsible for ensuring the
correct overall functioning. SIEMENS AG, its branch offices and associated
companies (hereinafter referred to as "Siemens") cannot guarantee all properties
of a system or machine not designed by SIEMENS.
SIEMENS can also not assume liability for recommendations given or implied by
the following description. No new guarantee/warranty or liability claims in
excess of the general terms and conditions of SIEMENS can be deduced from
the following description.
Handling
To facilitate and speed up access to special information, the manual contains the
following aids:
• A table of contents can be found at the beginning of the manual.
• The individual chapters contain subheadings to provide an overview of the
contents of the section.
• At the end of the manual there is an extensive index to enable you to quickly
access the required information.
Always up-to-date information
For questions on motor starters, your regional contact persons for
communication-capable low-voltage switchgear will be pleased to assist you.
You will find a list of contact persons and the latest version of the manual on the
Internet at:
http://www.siemens.de/sanftstarter
Please address technical questions to:
Corrections sheet
A corrections sheet is included at the end of the manual. Plese enter your
suggestions for improvement, supplements and corrections and send the sheet
back to us. This will help us to improve the following issue.
Technical Assistance: Telephone: [phone] (8°° - 17°° CET) Fax: [phone]
E-mail: technical-assist[email protected]
Internet: www.siemens.de/lowvoltage/technical-assistance
Technical support: Telephone:[phone]

Introduction
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 1-1
Introduction 1
Chapter Subject Page
1.1 Physical basics of the 3-phase asynchronous motor and mode of
operation of the soft starter
1-2
1.1.1 3-phase asynchronous motor 1-2
1.1.2 Operating mode of the SIRIUS 3RW44 electronic soft starter 1-4
1.2 Application and use 1-7
1.3 Boundary conditions for storage and operation 1-8

Introduction
SIRIUS 3RW44 manual
1-2 GWA 4NEB 535 2195-02 DS 01
1.1 Physical basics of the 3-phase asynchronous motor and mode
of operation of the soft starter
1.1.1 3-phase asynchronous motor
Applications of the 3-
phase asynchronous
motor
Thanks to their robust and simple design and low-maintenance operation, 3-
phase asynchronous motors are used in large numbers in commercial
applications, trade and industry.
Problem If switched on directly, the typical current and torque behavior of the 3-phase
asynchronous motor may negatively influence the feeding supply network and
the load machine during start-up.
Starting current 3-phase asynchronous motors have a high direct starting current I(starting).
Depending on the motor version, this current may be 3 times to 15 times the
size of the rated operating current. A typical value is the 7 to 8 times the size of
the motor rated current.
Disadvantage This results in the following disadvantage
• Higher load on the electrical supply network. This means that the supply
network must be dimensioned to this higher output during motor start-up.
Fig. 1-1: Typical starting current behavior of a 3-phase asynchronous motor
Start torque The start torque and the stalling torque can usually be assumed to be between
the 2 times and 4 times the rated torque. For the load machine, this means that
the starting and acceleration forces in relation to rated operation result in
increased mechanical load on the machine and the conveyed material.
Disadvantages This results in the following disadvantages
• Higher load on mechanical parts of the machine
• Higher costs because of application wear and maintenance
Motorstrom
I
Motordrehzahl
n
IDirektstart
INenn
nNenn
001_Stromkurven ohne Sanftstarter.wmf
Nom
Nom
Motor speed
Direct
on-line
starting
Motor current

Introduction
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 1-3
Fig. 1-2: Typical start torque behavior of a 3-phase asynchronous motor
Solution The current and torque behavior during start-up can be optimally adapted to the
requirement of the application using the SIRIUS 3RW44 electronic soft starter.
Motor-
drehmoment
M
Motordrehzahl
n
MDirektstart
MNenn
nNenn
MLast
z. B. Pumpe
MBeschleunigung
Motor
Mstall
002_Drehmomentkurven ohne Softstarter.wmf
Motor speed
Nom
Nom
Direct st.
Motor
torque
Acceleration
Load
e.g. pump

Introduction
SIRIUS 3RW44 manual
1-4 GWA 4NEB 535 2195-02 DS 01
1.1.2 Operating mode of the SIRIUS 3RW44 electronic soft starter
The 3RW44 soft starter has two antiparallel thyristors in each of the phases.
There is one thyristor for the positive and one thyristor for the negative half
wave.
Using phase angle control and various control methods, the r.m.s. value of the
motor voltage is increased from a definable start voltage or start torque to the
motor rated voltage within a selectable starting time.
The motor current acts proportional to the voltage applied to the motor. Thus the
starting current is reduced by the factor of the voltage that is applied to the
motor.
The torque behaves quadratically in relation to the voltage applied to the motor.
The start torque is thus reduced quadratically based on the voltage applied to
the motor.
Example
The following graphs illustrate the behavior of the starting current and torque of
a 3-phase asynchronous motor in combination with a soft starter:
Fig. 1-3: Reduced current behavior of the 3-phase asynchronous motor during start-up
with SIRIUS 3RW44 soft starter
SIEMENS motor 1LG4253AA (55 kW)
Rated data at 400 V:
Pe:55kW
Ie:100A
Idirect on-line start : approx. 700 A
Me: 355 Nm
Mdirect on-line start : approx. 700 Nm
Set start voltage: 50 % (1/2 supply voltage)
=> Istart 1/2 of the direct-start switch-on current (approx. 350 A)
=> Mstart 1/4 of the direct on-line start torque (approx. 175 Nm)
Motorstrom
I
Motordrehzahl
n
IDirektstart
INenn
nNenn
ISanftstarter
004_Stromkurven mit Sanftstarter.wmf
Direct
on-line
starting
Nom
Motor speed
Motor current
Soft
starter
Nom

Introduction
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 1-5
Fig. 1-4: Reduced torque behavior of the 3-phase asynchronous motor during start-up
with SIRIUS soft starter 3RW44
Motordreh-
moment
M
Motordrehzahl
n
MDirektstart
MSanftstart
Spannungsrampe
MSanftstart
Drehmomentgeregelt
MLast (z. B. Pumpe)
1
2
3
1
2
3
MNenn
nNenn
005_Drehmomentkurven mit Sanftstarter.vsd
Motor
torque
Motor speed
Soft start
voltage ramp
Soft start
torque-controlled
Load e.g. pump
Direct
on-line
starting
Nom
Nom

Introduction
SIRIUS 3RW44 manual
1-6 GWA 4NEB 535 2195-02 DS 01
Starting This means that because the electronic soft starter controls the motor voltage
during motor start-up, it simultaneously controls the ingoing starting current and
the start torque generated in the motor.
The same principle is also used during the stopping process. The effect is that
the torque generated in the motor is slowly reduced, thus enabling soft stopping
of the application.
During this process, the frequency remains constant and corresponds to the
network frequency, contrary to the frequency-controlled starting and stopping of
a frequency converter.
Upon completion of motor start-up, the thyristors are fully utilized, resulting in
the complete network voltage being applied to the motor terminals. Since no
motor voltage control is required during operation, the thyristors are bridged by
integrated bypass contacts. This reduces the waste heat developing during
continuous operation which is caused by power loss of the thyristor. Therefore,
the area around the switching devices heats up less.
The following graph illustrates the mode of operation of the 3RW44 soft starter:
Fig. 1-5: Phase angle control and schematic layout of a soft starter with internal bypass contacts
003_Phasenanschnitt und Thyristoren mit Bypass.dsf
UL1-
L3
G1
L3
L2
L1
UL1 -L3
M
3~
α α αϕ
t

Introduction
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 1-7
1.2 Application and use
Applications and
selection criteria
The 3RW44 soft starters are an alternative for star-delta starters and frequency
converters.
Their major benefits are smooth starting and stopping, uninterrupted
changeover without current peaks that would stress the power supply, and their
compact dimensions.
Numerous drives which so far could only be operated with frequency converters
can be changed over to soft starter operation using the 3RW44 soft starter, as
long as no speed control or particularly high start torque is required.
Applications Possible applications include:
• Conveyor belt
• Powered roller conveyors
• Compressors
• Ventilators
•Pumps
• Hydraulic pumps
•Stirrers
• Centrifugal machines
• Milling machines
• Mills
• Crushers
• Disk saws/ribbon saws
•...
Advantages Conveyor belts and systems:
• Jerk-free starting
• Jerk-free braking
Centrifugal pumps, reciprocating pumps:
• Water hammering is avoided
• Increased service life of the tubing
Stirrers, mixers:
• Reduced starting current
Fans:
• Reduced stress on transmissions and V-belts

Introduction
SIRIUS 3RW44 manual
1-8 GWA 4NEB 535 2195-02 DS 01
1.3 Boundary conditions for storage and operation
Caution
Please ensure that no liquid, dust or conductive parts
enter the soft starter!
Permissible ambient temperature for
- Storage -25 °C ... +80 °C
- Operation 0 °C .. +60 °C, from 40 °C with derating
(refer to chapter 9.3 Technical data)
Permissible relative air humidity 10 ... 95 %
Maximum permissible installation
height
3000 m, from 1000 m with derating

Configuration instructions
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01 2-1
Configuration instructions 2
Chapter Subject Page
2.1 Configuration 2-2
2.1.1 Serial PC interface RS 232 and Softstarter ES parameterizing and
operating software
2-2
2.1.2 Win-SOFTSTARTER selection and simulation program 2-2
2.1.3 Training course for SIRIUS soft starters (SD-SIRIUSO) 2-2
2.2 Normal or heavy starting 2-3
2.2.1 Example applications for normal starting (Class 10) 2-3
2.2.2 Example applications for heavy starting (Class 20) 2-3
2.2.3 Example applications for heaviest starting (Class 30) 2-4
2.3 On-time and switching frequency 2-5
2.4 Installation height and ambient temperature 2-6
2.5 Factory setting 2-7

Configuration instructions
SIRIUS 3RW44 manual
2-2 GWA 4NEB 535 2195-02 DS 01
2.1 Configuration
The electronic 3RW44 soft starters are designed for normal starting. A model
with higher output may be necessary for heavy starting or for a higher starting
frequency.
A PTC thermistor in the motor is recommended for long starting times. This also
applies to the soft stop, pump stop and DC braking stopping modes, since there
is an additional current load in contrast to coasting down.
No capacitive elements (e.g. compensation systems) must be included in the
motor branch between the soft starter and the motor. Active filters must not be
operated in combination with soft starters.
All elements of the main circuit (such as fuses and switching devices) must be
dimensioned for direct starting according to the local short-circuit conditions and
should be ordered separately.
The harmonic load of the starting current must be taken into account when
selecting circuit-breakers (release selection).
2.1.1 Serial PC interface RS 232 and Softstarter ES parameterizing and operating software
The electronic 3RW44 soft starters are fitted with a PC interface to
communicate with the Softstarter ES smart software and with an operating and
monitoring module.
2.1.2 Win-SOFTSTARTER selection and simulation program
This software allows all SIEMENS soft starters to be simulated and selected
using various parameters such as network conditions, motor data, load data,
special application requirements, etc.
The software is a powerful tool which makes time-consuming and complex
manual calculations for determining the suitable soft starter a thing of the past.
The CD-ROM can be ordered using the following order number:
Order no.: E20001-D1020-P302-V2-7400.
2.1.3 Training course for SIRIUS soft starters (SD-SIRIUSO)
In order to keep customers and the company's own personnel up-to-date in
terms of configuring, commissioning and maintenance, Siemens provides a two-
day training course for the electronic SIRIUS soft starters.
You can enroll or direct any queries here:
Training Center
I&S IS E&C TC
Werner-von-Siemens-Str. 65
91052 Erlangen, Germany
Telephone: ++49 9131 729262
Fax: ++49 9131 728172
[email protected]
http://www.siemens.de/sibrain