Siemens SINAMICS G130 Engineering Manual page 6

List of Contents
Engineering Information
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Effects of using fast-switching power components (IGBTs) ................................................................................. 75
Increased current load on the inverter output as a result of long motor cables .................................................... 75
Increased voltage stress on the motor winding as a result of long motor cables ................................................. 77
Bearing currents caused by steep voltage edges on the motor ........................................................................... 81
Measures for reducing bearing currents............................................................................................................... 82
1. EMC-compliant installation for optimized equipotential bonding in the drive system ....................................... 83
2. Insulated bearing at the non-drive end (NDE end) of the motor....................................................................... 86
3. Other measures ............................................................................................................................................... 86
Brief overview of the different types of bearing currents ...................................................................................... 87
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Motor reactors ...................................................................................................................................................... 89
Reduction of the voltage rate of rise dv/dt at the motor terminals ........................................................................ 89
Reduction of additional current peaks when long motor cables are used ............................................................ 89
Permissible motor cable lengths with motor reactor(s) for single-motor and multi-motor drives .......................... 90
Supplementary conditions which apply when motor reactors are used................................................................ 93
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dv/dt filter plus VPL .............................................................................................................................................. 94
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Sine-wave filters................................................................................................................................................... 96
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Load duty cycles .................................................................................................................................................. 98
General ................................................................................................................................................................ 98
Standard load duty cycles .................................................................................................................................... 98
Free load duty cycles ........................................................................................................................................... 99
Thermal monitoring of the power unit during load duty cycles and continuous operation .................................. 102
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Efficiency of SINAMICS converters at full load and at partial load ..................................................................... 103
Converter efficiency at full load .......................................................................................................................... 103
Converter efficiency at partial load ..................................................................................................................... 104
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Parallel connections of converters ..................................................................................................................... 110
General .............................................................................................................................................................. 110
Parallel connections of SINAMICS converters ................................................................................................... 110
Parallel connection of S120 Basic Line Modules ............................................................................................... 112
Parallel connection of S120 Smart Line Modules............................................................................................... 114
Parallel connection of S120 Active Line Modules .............................................................................................. 116
Parallel connection of S120 Motor Modules....................................................................................................... 116
Admissible and inadmissible winding systems for parallel connections of SINAMICS converters ..................... 118
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SINAMICS S120 Liquid-Cooled units in chassis format ..................................................................................... 121
General .............................................................................................................................................................. 121
Design of the SINAMICS S120 Liquid-Cooled units........................................................................................... 121
Requirements concerning coolant and cooling circuit ........................................................................................ 122
EMC Installation Guideline .................................................................................................................... 126
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Introduction ........................................................................................................................................................ 126
General .............................................................................................................................................................. 126
EC Directives ..................................................................................................................................................... 126
CE marking ........................................................................................................................................................ 126
EMC Directive .................................................................................................................................................... 127
EMC product standard EN 61800-3 ................................................................................................................... 127
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Fundamental principles of EMC ......................................................................................................................... 129
Definition of EMC ............................................................................................................................................... 129
Interference emissions and interference immunity............................................................................................. 130
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The frequency converter and its EMC................................................................................................................ 130
The frequency converter as a source of interference ......................................................................................... 130
SINAMICS Engineering Manual - May 2008
6/396
© Siemens AG