Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 8

Table of contents
7.7.6 Load torque monitoring (system protection) ............................................................................. 181
7.7.7 Speed and load failure via digital input ..................................................................................... 183
7.8 Status messages....................................................................................................................... 186
7.8.1 Overview, evaluating the inverter state..................................................................................... 186
7.8.2 System runtime ......................................................................................................................... 186
7.9 Technological functions............................................................................................................. 187
7.9.1 Braking functions of the inverter ............................................................................................... 187
7.9.1.1 Comparison of electrical braking methods................................................................................ 187
7.9.1.2 DC braking ................................................................................................................................ 190
7.9.1.3 Compound braking.................................................................................................................... 192
7.9.1.4 Dynamic braking ....................................................................................................................... 194
7.9.1.5 Braking with regenerative feedback to the line ......................................................................... 196
7.9.1.6 Motor holding brake .................................................................................................................. 197
7.9.2 Automatic restart and flying restart ........................................................................................... 203
7.9.2.1 Flying restart - switching on while the motor is running ........................................................... 203
7.9.2.2 Automatic switch-on .................................................................................................................. 205
7.9.3 PID technology controller .......................................................................................................... 209
7.9.4 Logical and arithmetic functions using function blocks ............................................................. 210
7.10 Safe Torque Off (STO) safety function ..................................................................................... 214
7.10.1 Prerequisite for STO use........................................................................................................... 214
7.10.2 Permitted sensors ..................................................................................................................... 214
7.10.3 Connecting fail-safe digital inputs ............................................................................................. 215
7.10.4 F-DI signal filtering .................................................................................................................... 216
7.10.5 Forced dormant error detection ................................................................................................ 219
7.10.6 Password................................................................................................................................... 220
7.10.7 Commissioning the STO ........................................................................................................... 220
7.10.7.1 Defining commissioning method ............................................................................................... 221
7.10.7.2 Assigning parameters to the STO............................................................................................. 221
7.10.7.3 Activate settings ........................................................................................................................ 222
7.10.7.4 Multiple assignment of the DI.................................................................................................... 222
7.10.8 Acceptance test - following completion of commissioning........................................................ 224
7.10.8.1 Prerequisites and authorized persons ...................................................................................... 224
7.10.8.2 Complete acceptance test......................................................................................................... 224
7.10.8.3 Reduced acceptance test.......................................................................................................... 225
7.10.8.4 Documentation .......................................................................................................................... 226
7.10.8.5 Completion of the certificate...................................................................................................... 228
7.11 Switchover between different settings ...................................................................................... 230
7.11.1 Changing over the command data sets (manual, automatic) ................................................... 230
7.11.2 Switching over drive data sets (different motors connected to an inverter).............................. 233
8 Service and maintenance ...................................................................................................................... 237
8.1 Replacing the inverter components .......................................................................................... 237
8.2 Replacing the Control Unit ........................................................................................................ 239
8.3 Replacing the Power Module .................................................................................................... 241
9 Alarms, faults and system messages..................................................................................................... 243
9.1 Operating states indicated on LEDs ......................................................................................... 244
9.2 Alarms ....................................................................................................................................... 246
9.3 List of warnings ......................................................................................................................... 249
9.4 Faults......................................................................................................................................... 251
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Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA