Table Of Contents - Siemens MICROMASTER 420 Reference Manual

1.1 Purpose of this Manual..............................................................................................2
1.2 Compatibilty ...............................................................................................................2
2.1 Current Limit and Overload Operation ......................................................................8
2.2 Fast Current Limit ......................................................................................................9
2.3 Positive Temperature Coefficient Resistor Use.......................................................10
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2.4 I t Performance........................................................................................................10
2.5 Internal Overtemperature ........................................................................................10
2.6 Overvoltage and Trip Levels....................................................................................11
2.7 Boost........................................................................................................................11
2.8 Proportional and Integral Control (PI)......................................................................12
2.9 Braking.....................................................................................................................20
2.10 Derating Factors ......................................................................................................22
2.11 Cubicle Calculations ................................................................................................26
2.12 Thermal Protection and Automatic De-rating ..........................................................26
2.13 Operation from Unearthed Supplies ........................................................................27
2.14 Multi-Motor Connection ...........................................................................................27
2.15 Control Modes (P1300) ...........................................................................................27
2.16 Working with Binary Connectors (BiCo) ..................................................................28
2.17 Acoustic Noise .........................................................................................................35
2.18 Harmonic Currents ..................................................................................................36
2.19 Power Losses ..........................................................................................................38
MICROMASTER 420 Reference Manual
Issue A1
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