Siemens SINAMICS G120C Operating Instructions Manual page 13

6.2.10.4 Extend telegrams and change signal interconnection .......................................................... 161
6.2.10.5 Configuring the IP interface .................................................................................................. 163
6.2.10.6 Slave-to-slave communication .............................................................................................. 164
6.2.10.7 Acyclically reading and writing inverter parameters ............................................................. 164
6.2.11 Control via additional fieldbuses ........................................................................................... 165
6.2.11.1 Modbus RTU ......................................................................................................................... 165
6.2.11.2 USS ....................................................................................................................................... 168
6.2.11.3 CANopen .............................................................................................................................. 171
6.2.11.4 Ethernet/IP ............................................................................................................................ 172
6.2.12 Switching over the inverter control (command data set) ...................................................... 173
6.3 Setpoints ............................................................................................................................... 175
6.3.1 Overview ............................................................................................................................... 175
6.3.2 Analog input as setpoint source ............................................................................................ 176
6.3.3 Specifying the setpoint via the fieldbus................................................................................. 177
6.3.4 Motorized potentiometer as setpoint source ......................................................................... 178
6.3.5 Fixed speed as setpoint source ............................................................................................ 180
6.4 Setpoint calculation ............................................................................................................... 183
6.4.1 Overview of setpoint processing ........................................................................................... 183
6.4.2 Invert setpoint ....................................................................................................................... 184
6.4.3 Inhibit direction of rotation ..................................................................................................... 185
6.4.4 Skip frequency bands and minimum speed .......................................................................... 186
6.4.5 Speed limitation .................................................................................................................... 187
6.4.6 Ramp-function generator ...................................................................................................... 188
6.5 Motor control ......................................................................................................................... 193
6.5.1 V/f control .............................................................................................................................. 193
6.5.1.1 Characteristics of U/f control ................................................................................................. 195
6.5.1.2 Optimizing motor starting ...................................................................................................... 198
6.5.2 Vector control with speed controller ...................................................................................... 201
6.5.2.1 Optimizing the speed controller ............................................................................................ 203
6.5.2.2 Friction characteristic ............................................................................................................ 205
6.5.2.3 Moment of inertia estimator .................................................................................................. 208
6.5.2.4 Pole position identification .................................................................................................... 213
6.6 Protection functions .............................................................................................................. 214
6.6.1 Inverter temperature monitoring ........................................................................................... 214
6.6.2 Motor temperature monitoring using a temperature sensor ................................................. 217
6.6.3 Overcurrent protection .......................................................................................................... 220
6.6.4 Limiting the maximum DC link voltage .................................................................................. 221
6.7 Application-specific functions ................................................................................................ 222
6.7.1 Unit changeover .................................................................................................................... 223
6.7.1.1 Changing over the motor standard ....................................................................................... 224
6.7.1.2 Changing over the unit system ............................................................................................. 225
6.7.1.3 Changing over process variables for the technology controller ............................................ 225
6.7.1.4 Switching units with STARTER ............................................................................................. 226
6.7.2 Calculating the energy saving ............................................................................................... 227
6.7.3 Electrically braking the motor ................................................................................................ 229
6.7.3.1 DC braking ............................................................................................................................ 231
6.7.3.2 Compound braking ................................................................................................................ 234
6.7.3.3 Dynamic braking ................................................................................................................... 236
6.7.4 Motor holding brake .............................................................................................................. 238
6.7.5 Flying restart - switching on while the motor is running ....................................................... 243
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
Table of contents
9