Table of Contents
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Table of contents
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
6
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
SINAMICS G120XA converter
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