Siemens SINAMICS G120D Series Operating Instructions Manual page 9

7.3 Setpoints ............................................................................................................................... 129
7.3.1 Overview ............................................................................................................................... 129
7.3.2 Analog input as setpoint source ............................................................................................ 130
7.3.3 Specifying the setpoint via the fieldbus................................................................................. 130
7.3.4 Motorized potentiometer as setpoint source ......................................................................... 131
7.3.5 Fixed speed as setpoint source ............................................................................................ 133
7.4 Setpoint calculation ............................................................................................................... 136
7.4.1 Overview of setpoint processing ........................................................................................... 136
7.4.2 Invert setpoint ....................................................................................................................... 137
7.4.3 Inhibit direction of rotation ..................................................................................................... 138
7.4.4 Skip frequency bands and minimum speed .......................................................................... 139
7.4.5 Speed limitation .................................................................................................................... 140
7.4.6 Ramp-function generator ...................................................................................................... 141
7.5 Motor control ......................................................................................................................... 146
7.5.1 V/f control .............................................................................................................................. 146
7.5.1.1 Characteristics of U/f control ................................................................................................. 147
7.5.1.2 Selecting the U/f characteristic ............................................................................................. 148
7.5.1.3 Optimizing motor starting ...................................................................................................... 149
7.5.2 Vector control with speed controller ...................................................................................... 151
7.5.2.1 Checking the encoder signal ................................................................................................ 152
7.5.2.2 Select motor control .............................................................................................................. 153
7.5.2.3 Optimizing the speed controller ............................................................................................ 153
7.5.2.4 Advanced settings ................................................................................................................. 156
7.5.2.5 Friction characteristic ............................................................................................................ 157
7.5.2.6 Moment of inertia estimator .................................................................................................. 159
7.5.2.7 Pole position identification .................................................................................................... 164
7.5.3 Torque control ....................................................................................................................... 165
7.6 Protection functions .............................................................................................................. 167
7.6.1 Inverter temperature monitoring ........................................................................................... 167
7.6.2 Motor temperature monitoring using a temperature sensor ................................................. 170
7.6.3 Protecting the motor by calculating the motor temperature .................................................. 172
7.6.4 Overcurrent protection .......................................................................................................... 174
7.7 Application-specific functions ................................................................................................ 175
7.7.1 Functions that match the application .................................................................................... 175
7.7.2 Unit changeover .................................................................................................................... 176
7.7.2.1 Changing over the motor standard ....................................................................................... 177
7.7.2.2 Changing over the unit system ............................................................................................. 178
7.7.2.3 Changing over process variables for the technology controller ............................................ 178
7.7.2.4 Switching units with STARTER ............................................................................................. 179
7.7.3 Electrically braking the motor ................................................................................................ 180
7.7.3.1 DC braking ............................................................................................................................ 180
7.7.3.2 Braking with regenerative feedback to the line ..................................................................... 183
7.7.4 Motor holding brake .............................................................................................................. 184
7.7.5 PID technology controller ...................................................................................................... 188
7.7.5.1 Overview ............................................................................................................................... 188
7.7.5.2 Setting the controller ............................................................................................................. 189
7.7.5.3 Optimizing the controller ....................................................................................................... 192
7.7.6 System protection ................................................................................................................. 193
7.7.6.1 No-load monitoring, blocking protection, stall protection ...................................................... 194
7.7.6.2 Load monitoring .................................................................................................................... 195
Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
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