Siemens sinamics G120 Operating Instructions Manual page 10

Table of contents
6.3 Setpoints .............................................................................................................................. 205
6.3.1 Overview .............................................................................................................................. 205
6.3.2 Analog input as setpoint source ........................................................................................... 206
6.3.3 Specifying the setpoint via the fieldbus ................................................................................ 207
6.3.4 Motorized potentiometer as setpoint source ........................................................................ 208
6.3.5 Fixed speed as setpoint source ........................................................................................... 210
6.3.6 Pulse input as source of setpoint value ............................................................................... 213
6.4 Setpoint calculation .............................................................................................................. 215
6.4.1 Overview of setpoint processing .......................................................................................... 215
6.4.2 Invert setpoint ....................................................................................................................... 216
6.4.3 Inhibit direction of rotation .................................................................................................... 217
6.4.4 Skip frequency bands and minimum speed ......................................................................... 218
6.4.5 Speed limitation.................................................................................................................... 219
6.4.6 Ramp-function generator ..................................................................................................... 220
6.5 Motor control ........................................................................................................................ 225
6.5.1 V/f control ............................................................................................................................. 225
6.5.1.1 Characteristics of U/f control ................................................................................................ 227
6.5.1.2 Optimizing motor starting ..................................................................................................... 230
6.5.2 Vector control with speed controller ..................................................................................... 233
6.5.2.1 Checking the encoder signal ................................................................................................ 235
6.5.2.2 Optimizing the speed controller ........................................................................................... 235
6.5.2.3 Advanced settings ................................................................................................................ 238
6.5.2.4 Friction characteristic ........................................................................................................... 239
6.5.2.5 Moment of inertia estimator ................................................................................................. 242
6.5.2.6 Pole position identification ................................................................................................... 247
6.5.3 Torque control ...................................................................................................................... 248
6.6 Protection functions ............................................................................................................. 250
6.6.1 Inverter temperature monitoring ........................................................................................... 250
6.6.2 Motor temperature monitoring of the motor using a temperature sensor ............................ 253
6.6.3 Protecting the motor by calculating the motor temperature ................................................. 257
6.6.4 Overcurrent protection ......................................................................................................... 261
6.6.5 Limiting the maximum DC link voltage ................................................................................. 262
6.7 Application-specific functions ............................................................................................... 264
6.7.1 Unit changeover ................................................................................................................... 265
6.7.1.1 Changing over the motor standard ...................................................................................... 266
6.7.1.2 Changing over the unit system ............................................................................................ 267
6.7.1.3 Changing over process variables for the technology controller ........................................... 267
6.7.1.4 Switching units with STARTER ............................................................................................ 268
6.7.2 Calculating the energy saving for fluid flow machines ......................................................... 269
6.7.3 Electrically braking the motor ............................................................................................... 271
6.7.3.1 DC braking ........................................................................................................................... 273
6.7.3.2 Compound braking ............................................................................................................... 276
6.7.3.3 Dynamic braking .................................................................................................................. 278
6.7.3.4 Braking with regenerative feedback to the line .................................................................... 280
6.7.4 Motor holding brake ............................................................................................................. 281
6.7.5 Flying restart - switching on while the motor is running ...................................................... 286
6.7.6 Automatic restart .................................................................................................................. 288
6.7.7 Kinetic buffering (Vdc min control) ....................................................................................... 292
6.7.8 Line contactor control ........................................................................................................... 294
6.7.9 PID technology controller ..................................................................................................... 296
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Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Converter with CU250S-2 Control Unit