Siemens SINAMICS G120 Instructions d'exploitation Page 9

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Table of contents
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
7
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
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