Siemens 3RW44 - Default Chapter; Table of Contents

3RW44 soft starters
4 Manual, 03/2017, NEB535219502000/RS-AB/008
Table of contents
1 Important notes .......................................................................................................................................... 9
1.1 Security information ............................................................................................................... 11
2 Introduction .............................................................................................................................................. 12
2.1 Basic physical principles of the three-phase asynchronous motor and operating
principle of the soft starter ...................................................................................................... 12
2.1.1 Three-phase asynchronous motor ......................................................................................... 12
2.1.2 Principle of operation of the 3RW44 electronic soft starter ................................................... 14
2.2 Application and use ................................................................................................................ 17
2.3 Marginal conditions for storage and operation ....................................................................... 19
3 Configuration instructions ........................................................................................................................ 20
3.1 Configuration .......................................................................................................................... 20
3.1.1 RS 232 serial PC interface and Soft Starter ES parameterizing and operating software ...... 20
3.1.2 Simulation Tool for Soft Starters (STS) ................................................................................. 20
3.2 Startup class .......................................................................................................................... 21
3.2.1 Application examples for normal starting (CLASS 10)........................................................... 22
3.2.2 Application examples for heavy starting (CLASS 20) ............................................................ 23
3.2.3 Application examples for very heavy starting (CLASS 30) .................................................... 24
3.3 ON time and switching frequency .......................................................................................... 25
3.4 Installation altitude and ambient temperature ........................................................................ 26
3.5 Factory settings ...................................................................................................................... 27
3.6 Article number system for SIRIUS 3RW44 soft starters ........................................................ 28
4 Installation, connection and feeder configuration ..................................................................................... 29
4.1 Installing the soft starter ......................................................................................................... 29
4.1.1 Unpacking .............................................................................................................................. 29
4.1.2 Mounting position ................................................................................................................... 29
4.1.3 Installation requirements ........................................................................................................ 30
4.1.4 Mounting dimensions and clearances ................................................................................... 31
4.2 Design of the feeder ............................................................................................................... 32
4.2.1 General information ............................................................................................................... 32
4.2.2 Soft starters in standard circuits ............................................................................................. 33
4.2.3 Soft starters in inside-delta circuits ........................................................................................ 35
4.2.4 Soft starter with contactor disconnector (main contactor) ..................................................... 38
4.3 Protection of the soft starter against short-circuits (type of assignment 2) ............................ 40
4.4 Capacitors for improving the power factor ............................................................................. 41
4.5 Generator operation with three-phase asynchronous motor ................................................. 42
4.6 Electrical connection .............................................................................................................. 42
4.6.1 Control and auxiliary circuit connection ................................................................................. 42