Siemens SINAMICS G120 Operating Instructions Manual page 10

Table of contents
6.2.11.2 USS ...................................................................................................................................... 213
6.2.11.3 Ethernet/IP ........................................................................................................................... 216
6.2.12 Switching over the inverter control (command data set)...................................................... 217
6.3 Setpoints .............................................................................................................................. 219
6.3.1 Overview .............................................................................................................................. 219
6.3.2 Analog input as setpoint source ........................................................................................... 220
6.3.3 Specifying the setpoint via the fieldbus ................................................................................ 221
6.3.4 Motorized potentiometer as setpoint source ........................................................................ 222
6.3.5 Fixed speed as setpoint source ........................................................................................... 224
6.4 Setpoint calculation .............................................................................................................. 227
6.4.1 Overview of setpoint processing .......................................................................................... 227
6.4.2 Invert setpoint ....................................................................................................................... 228
6.4.3 Inhibit direction of rotation .................................................................................................... 229
6.4.4 Skip frequency bands and minimum speed ......................................................................... 230
6.4.5 Speed limitation.................................................................................................................... 231
6.4.6 Ramp-function generator ..................................................................................................... 232
6.5 Motor control ........................................................................................................................ 237
6.5.1 V/f control ............................................................................................................................. 237
6.5.1.1 Characteristics of U/f control ................................................................................................ 239
6.5.1.2 Optimizing motor starting ..................................................................................................... 242
6.5.2 Vector control with speed controller ..................................................................................... 246
6.5.2.1 Overview .............................................................................................................................. 246
6.5.2.2 Optimizing the closed-loop speed controller ........................................................................ 248
6.5.2.3 Advanced settings ................................................................................................................ 250
6.5.2.4 Friction characteristic ........................................................................................................... 252
6.5.2.5 Moment of inertia estimator ................................................................................................. 254
6.5.2.6 Pole position identification ................................................................................................... 259
6.5.3 Torque control ...................................................................................................................... 260
6.6 Protection functions ............................................................................................................. 262
6.6.1 Inverter temperature monitoring ........................................................................................... 262
6.6.2 Motor temperature monitoring using a temperature sensor ................................................ 265
6.6.3 Protecting the motor by calculating the motor temperature ................................................. 269
6.6.4 Overcurrent protection ......................................................................................................... 273
6.6.5 Limiting the maximum DC link voltage ................................................................................. 274
6.7 Application-specific functions ............................................................................................... 276
6.7.1 Unit changeover ................................................................................................................... 276
6.7.1.1 Changing over the motor standard ...................................................................................... 278
6.7.1.2 Changing over the unit system ............................................................................................ 279
6.7.1.3 Changing over process variables for the technology controller ........................................... 279
6.7.1.4 Switching units with STARTER ............................................................................................ 280
6.7.2 Calculating the energy saving for fluid flow machines ......................................................... 281
6.7.3 Electrically braking the motor ............................................................................................... 283
6.7.3.1 DC braking ........................................................................................................................... 285
6.7.3.2 Compound braking ............................................................................................................... 288
6.7.3.3 Dynamic braking .................................................................................................................. 290
6.7.3.4 Braking with regenerative feedback to the line .................................................................... 292
6.7.4 Motor holding brake ............................................................................................................. 293
6.7.5 Flying restart - switching on while the motor is running ...................................................... 298
6.7.6 Automatic restart .................................................................................................................. 300
6.7.7 Kinetic buffering (Vdc min control) ....................................................................................... 304
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Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC