Siemens SINAMICS G120XA - Page 8

6.4.1.2 Specifying the setpoint via the fieldbus ................................................................................226
6.4.1.3 Motorized potentiometer as setpoint source ........................................................................227
6.4.1.4 Fixed speed setpoint as setpoint source..............................................................................230
6.4.2 Setpoint processing..............................................................................................................235
6.4.2.1 Overview ..............................................................................................................................235
6.4.2.2 Invert setpoint.......................................................................................................................236
6.4.2.3 Enable direction of rotation ..................................................................................................237
6.4.2.4 Skip frequency bands and minimum speed .........................................................................238
6.4.2.5 Speed limitation....................................................................................................................241
6.4.2.6 Ramp-function generator .....................................................................................................242
6.4.2.7 Dual ramp function ...............................................................................................................245
6.5 Technology controller...........................................................................................................247
6.5.1 PID technology controller .....................................................................................................247
6.5.1.1 Autotuning the PID technology controller.............................................................................258
6.5.1.2 Adapting Kp and Tn .............................................................................................................261
6.5.2 Free technology controllers..................................................................................................264
6.5.3 Staging control .....................................................................................................................265
6.5.4 Real time clock (RTC) ..........................................................................................................270
6.5.5 Time switch (DTC) ...............................................................................................................272
6.6 Motor control ........................................................................................................................273
6.6.1 Reactor, filter and cable resistance at the converter output.................................................273
6.6.2 V/f control .............................................................................................................................274
6.6.2.1 U/f control.............................................................................................................................274
6.6.2.2 Optimizing motor starting .....................................................................................................279
6.6.2.3 U/f control with Standard Drive Control................................................................................284
6.6.2.4 Optimizing the motor start-up for application class Standard Drive Control.........................286
6.6.3 Encoderless vector control...................................................................................................288
6.6.3.1 Structure of vector control without encoder (sensorless) .....................................................288
6.6.3.2 Optimizing the speed controller............................................................................................293
6.6.4 Electrically braking the motor ...............................................................................................295
6.6.4.1 DC braking ...........................................................................................................................297
6.6.4.2 Compound braking...............................................................................................................299
6.6.5 Pulse frequency wobbling ....................................................................................................300
6.7 Drive protection ....................................................................................................................301
6.7.1 Overcurrent protection .........................................................................................................301
6.7.2 Converter protection using temperature monitoring.............................................................302
6.7.3 Motor protection with temperature sensor............................................................................305
6.7.4 Motor protection by calculating the temperature ..................................................................307
6.7.5 Motor and converter protection by limiting the voltage.........................................................309
6.7.6 Monitoring the driven load....................................................................................................310
6.7.6.1 Stall protection .....................................................................................................................312
6.7.6.2 No-load monitoring...............................................................................................................312
6.7.6.3 Blocking protection...............................................................................................................313
6.7.6.4 Torque monitoring ................................................................................................................314
6.7.6.5 Blocking protection, leakage protection and dry-running protection ....................................315
6.7.6.6 Rotation monitoring ..............................................................................................................317
6.8 Drive availability ...................................................................................................................318
6.8.1 Flying restart – switching on while the motor is running.......................................................318
6.8.2 Automatic restart ..................................................................................................................320
6.8.3 Kinetic buffering (Vdc min control) .......................................................................................323
Table of contents
SINAMICS G120XA converter
6 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB