Siemens SIMATIC ET 200pro - Page 7

Table of contents
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
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8.4 Setpoint calculation ............................................................................................................... 107
8.4.1 Overview of setpoint processing ........................................................................................... 107
8.4.2 Invert setpoint ....................................................................................................................... 108
8.4.3 Inhibit direction of rotation ..................................................................................................... 108
8.4.4 Skip frequency bands and minimum speed .......................................................................... 109
8.4.5 Speed limitation .................................................................................................................... 110
8.4.6 Ramp-function generator ...................................................................................................... 110
8.5 Motor control ......................................................................................................................... 115
8.5.1 V/f control .............................................................................................................................. 115
8.5.1.1 Characteristics of U/f control ................................................................................................. 116
8.5.1.2 Selecting the U/f characteristic ............................................................................................. 117
8.5.1.3 Optimizing motor starting ...................................................................................................... 118
8.5.2 Vector control ........................................................................................................................ 120
8.5.2.1 Overview ............................................................................................................................... 120
8.5.2.2 Select motor control .............................................................................................................. 121
8.5.2.3 Optimizing the speed controller ............................................................................................ 122
8.5.2.4 Friction characteristic ............................................................................................................ 124
8.5.2.5 Moment of inertia estimator .................................................................................................. 126
8.6 Protection and monitoring functions ..................................................................................... 132
8.6.1 Inverter temperature monitoring ........................................................................................... 132
8.6.2 Monitor the motor temperature via a temperature sensor .................................................... 135
8.6.3 Protecting the motor by calculating the motor temperature .................................................. 138
8.6.4 Overcurrent protection .......................................................................................................... 139
8.7 Application-specific functions ................................................................................................ 140
8.7.1 Functions that match the application .................................................................................... 140
8.7.2 Unit changeover .................................................................................................................... 141
8.7.2.1 Changing over the motor standard ....................................................................................... 142
8.7.2.2 Changing over the unit system ............................................................................................. 142
8.7.2.3 Changing over process variables for the technology controller ............................................ 143
8.7.2.4 Switching units with STARTER ............................................................................................. 143
8.7.3 Braking the motor electrically ................................................................................................ 145
8.7.3.1 DC braking ............................................................................................................................ 145
8.7.3.2 Braking with regenerative feedback to the line ..................................................................... 148
8.7.4 Motor holding brake .............................................................................................................. 148
8.8 Safe Torque Off (STO) safety function ................................................................................. 153
8.8.1 Description of functions......................................................................................................... 153
8.8.2
Prerequisite for STO use ...................................................................................................... 156
8.8.3 Commissioning STO ............................................................................................................. 156
8.8.3.1 Commissioning tool ............................................................................................................... 156
8.8.3.2 Protection of the settings from unauthorized changes ......................................................... 157
8.8.3.3 Changing settings ................................................................................................................. 157
8.8.3.4 Interconnecting the "STO active" signal ............................................................................... 158
8.8.3.5 Setting the STO input signal ................................................................................................. 159
8.8.3.6 Setting the forced checking procedure (test stop) ................................................................ 160
8.8.3.7 Activate settings .................................................................................................................... 161
8.8.3.8 Approval - completing commissioning .................................................................................. 162
8.9 Switchover between different settings .................................................................................. 166