6.15.1 Function description.............................................................................................................215
6.15.2 Commissioning STO............................................................................................................217
6.15.2.1 Safety functions password...................................................................................................217
6.15.2.2 Configuring a safety function................................................................................................219
6.15.2.3 Interconnecting the "STO active" signal...............................................................................221
6.15.2.4 Setting the filter for fail-safe digital inputs............................................................................223
6.15.2.5 Setting the forced checking procedure (test stop)................................................................225
6.15.2.6 Activating the settings and checking the digital inputs.........................................................228
6.15.2.7 Acceptance - completion of commissioning.........................................................................232
6.16 Setpoints..............................................................................................................................235
6.16.1 Overview..............................................................................................................................235
6.16.2 Analog input as setpoint source...........................................................................................236
6.16.3 Specifying the setpoint via the fieldbus................................................................................237
6.16.4 Motorized potentiometer as setpoint source........................................................................238
6.16.5 Fixed speed setpoint as setpoint source..............................................................................240
6.17 Setpoint calculation..............................................................................................................243
6.17.1 Overview of setpoint processing..........................................................................................243
6.17.2 Invert setpoint.......................................................................................................................244
6.17.3 Inhibit direction of rotation....................................................................................................245
6.17.4 Skip frequency bands and minimum speed.........................................................................246
6.17.5 Speed limitation....................................................................................................................247
6.17.6 Ramp-function generator.....................................................................................................248
6.18 PID technology controller.....................................................................................................252
6.19 Motor control........................................................................................................................258
6.19.1 Reactor, filter and cable resistance at the inverter output....................................................258
6.19.2 V/f control.............................................................................................................................259
6.19.2.1 Characteristics of U/f control................................................................................................261
6.19.2.2 Optimizing motor starting.....................................................................................................264
6.19.3 Encoderless vector control...................................................................................................268
6.19.3.1 Structure of vector control without encoder (sensorless).....................................................268
6.19.3.2 Optimizing the speed controller............................................................................................270
6.19.3.3 Advanced settings................................................................................................................273
6.19.3.4 Friction characteristic...........................................................................................................274
6.19.3.5 Moment of inertia estimator..................................................................................................276
6.19.4 Application examples for closed-loop motor control.............................................................282
6.20 Electrically braking the motor...............................................................................................283
6.20.1 DC braking...........................................................................................................................285
6.20.2 Compound braking...............................................................................................................288
6.20.3 Dynamic braking..................................................................................................................290
6.21 Overcurrent protection.........................................................................................................292
6.22 Inverter protection using temperature monitoring................................................................293
6.23 Motor protection with temperature sensor............................................................................296
6.24 Motor protection by calculating the temperature..................................................................299
6.25 Motor and inverter protection by limiting the voltage............................................................301
6.26 Flying restart – switching on while the motor is running.......................................................303
6.27 Automatic restart..................................................................................................................305
Table of contents
SINAMICS G120C converter
10 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
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