Siemens SINAMICS G120 Operating Instructions Manual page 9

6.2.2.1 Setting the address ....................................................................................................................123
6.2.2.2 Basic settings for communication ..............................................................................................124
6.2.2.3 Structure of a USS telegram ......................................................................................................124
6.2.2.4 User data range of the USS telegram........................................................................................126
6.2.2.5 Data structure of the USS parameter channel...........................................................................127
6.2.2.6 USS read request ......................................................................................................................132
6.2.2.7 USS write job .............................................................................................................................133
6.2.2.8 USS process data channel (PZD)..............................................................................................134
6.2.2.9 Time-out and other errors ..........................................................................................................134
6.2.3 Communication over Modbus RTU............................................................................................137
6.2.3.1 Setting the address ....................................................................................................................138
6.2.3.2 Basic settings for communication ..............................................................................................138
6.2.3.3 Modbus RTU telegram...............................................................................................................139
6.2.3.4 Baud rates and mapping tables .................................................................................................140
6.2.3.5 Write and read access via FC 3 and FC 6.................................................................................143
6.2.3.6 Communication procedure.........................................................................................................145
7 Functions ............................................................................................................................................... 147
7.1 Overview of the inverter functions..............................................................................................147
7.2 Inverter control ...........................................................................................................................149
7.2.1 Two-wire control: method 1........................................................................................................150
7.2.2 Two-wire control, method 2........................................................................................................151
7.2.3 Two-wire control, method 3........................................................................................................152
7.2.4 Three-wire control, method 1 .....................................................................................................153
7.2.5 Three-wire control, method 2 .....................................................................................................154
7.2.6 Switching over the inverter control (command data set) ...........................................................155
7.3 Command sources.....................................................................................................................158
7.4 Setpoint sources ........................................................................................................................159
7.4.1 Analog input as setpoint source.................................................................................................159
7.4.2 Motorized potentiometer as setpoint source..............................................................................160
7.4.3 Fixed speed as setpoint source .................................................................................................162
7.4.4 Running the motor in jog mode (JOG function) .........................................................................164
7.4.5 Specifying the motor speed via the fieldbus ..............................................................................165
7.5 Setpoint calculation....................................................................................................................166
7.5.1 Minimum speed and maximum speed .......................................................................................166
7.5.2 Ramp-function generator ...........................................................................................................167
7.6 Motor control ..............................................................................................................................168
7.6.1 V/f control ...................................................................................................................................169
7.6.1.1 V/f control with linear and square-law characteristic..................................................................169
7.6.1.2 Additional characteristics for the V/f control...............................................................................170
7.6.1.3 Optimizing with a high break loose torque and brief overload...................................................171
7.6.2 Vector control .............................................................................................................................173
7.6.2.1 Properties of vector control ........................................................................................................173
7.6.2.2 Commissioning vector control....................................................................................................173
7.6.2.3 Torque control ............................................................................................................................174
7.7 Protection functions ...................................................................................................................175
7.7.1 Inverter temperature monitoring.................................................................................................175
7.7.2 Motor temperature monitoring using a temperature sensor ......................................................176
7.7.3 Protecting the motor by calculating the motor temperature.......................................................178
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
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