Siemens SINAMICS G120D Operating Instructions Manual page 9

8.3.3 Specifying the setpoint via the fieldbus ...................................................................................... 115
8.3.4 Motorized potentiometer as setpoint source .............................................................................. 116
8.3.5 Fixed speed as setpoint source ................................................................................................. 118
8.4 Setpoint calculation .................................................................................................................... 121
8.4.1 Overview of setpoint processing ................................................................................................ 121
8.4.2 Invert setpoint ............................................................................................................................. 122
8.4.3 Inhibit direction of rotation .......................................................................................................... 122
8.4.4 Skip frequency bands and minimum speed ............................................................................... 123
8.4.5 Speed limitation.......................................................................................................................... 124
8.4.6 Ramp-function generator ........................................................................................................... 125
8.5 Motor control .............................................................................................................................. 130
8.5.1 V/f control ................................................................................................................................... 130
8.5.1.1 Characteristics of U/f control ...................................................................................................... 131
8.5.1.2 Selecting the U/f characteristic .................................................................................................. 133
8.5.1.3 Optimizing with a high break loose torque and brief overload ................................................... 134
8.5.2 Vector control ............................................................................................................................. 135
8.5.2.1 Checking the encoder signal ...................................................................................................... 136
8.5.2.2 Select motor control ................................................................................................................... 136
8.5.2.3 Pole position identification ......................................................................................................... 137
8.5.2.4 Optimizing the speed controller ................................................................................................. 138
8.5.2.5 Moment of inertia estimator ....................................................................................................... 139
8.5.2.6 Advanced settings ...................................................................................................................... 143
8.5.3 Torque control ............................................................................................................................ 144
8.6 Protection and monitoring functions........................................................................................... 145
8.6.1 Inverter temperature monitoring ................................................................................................. 145
8.6.2 Motor temperature monitoring using a temperature sensor ...................................................... 148
8.6.3 Protecting the motor by calculating the motor temperature ....................................................... 151
8.6.4 Overcurrent protection ............................................................................................................... 153
8.7 Application-specific functions ..................................................................................................... 154
8.7.1 Functions that match the application ......................................................................................... 154
8.7.2 Unit changeover ......................................................................................................................... 155
8.7.2.1 Changing over the motor standard ............................................................................................ 156
8.7.2.2 Changing over the unit system .................................................................................................. 156
8.7.2.3 Changing over process variables for the technology controller ................................................. 157
8.7.2.4 Switching units with STARTER .................................................................................................. 158
8.7.3 Electrically braking the motor ..................................................................................................... 159
8.7.3.1 DC braking ................................................................................................................................. 159
8.7.3.2 Braking with regenerative feedback to the line .......................................................................... 162
8.7.4 Motor holding brake ................................................................................................................... 163
8.7.5 PID technology controller ........................................................................................................... 167
8.7.5.1 Overview .................................................................................................................................... 167
8.7.5.2 Setting the controller .................................................................................................................. 168
8.7.5.3 Optimizing the controller ............................................................................................................ 170
8.7.6 Monitoring the load torque (system protection) ......................................................................... 171
8.7.7 Load failure monitoring .............................................................................................................. 173
8.7.8 Speed deviation monitoring ....................................................................................................... 174
8.7.9 Free function blocks ................................................................................................................... 176
8.7.9.1 Overview .................................................................................................................................... 176
8.7.9.2 Further information ..................................................................................................................... 176
8.8 Safe Torque Off (STO) safety function ...................................................................................... 177
Converter with control units CU240D-2
Operating Instructions, 04/2014, FW V4.7, A5E34262100B AA
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