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Table of contents
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
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Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
7.5.2
Ramp-function generator .......................................................................................................... 203
7.6
Motor control ............................................................................................................................. 204
7.6.1
V/f control .................................................................................................................................. 206
7.6.1.1 V/f control with linear and square-law characteristic................................................................. 206
7.6.1.2 Additional characteristics for the V/f control.............................................................................. 207
7.6.1.3 Optimizing with a high break loose torque and brief overload.................................................. 208
7.6.2
Vector control ............................................................................................................................ 210
7.6.2.1 Properties of vector control ....................................................................................................... 210
7.6.2.2 Commissioning vector control................................................................................................... 210
7.6.2.3 Torque control ........................................................................................................................... 211
7.7
Protection functions................................................................................................................... 212
7.7.1
Inverter temperature monitoring................................................................................................ 212
7.7.2
Motor temperature monitoring using a temperature sensor...................................................... 213
7.7.3
Protecting the motor by calculating the motor temperature...................................................... 215
7.7.4
Overcurrent protection .............................................................................................................. 215
7.7.5
Limiting the maximum DC link voltage...................................................................................... 216
7.8
Status messages....................................................................................................................... 218
7.8.1
System runtime ......................................................................................................................... 218
7.9
Application-specific functions.................................................................................................... 219
7.9.1
Unit changeover ........................................................................................................................ 219
7.9.1.1 Changing over the motor standard ........................................................................................... 220
7.9.1.2 Changing over the unit system ................................................................................................. 221
7.9.1.3 Changing over process variables for the technology controller................................................ 222
7.9.1.4 Changing of the units with STARTER....................................................................................... 223
7.9.2
Braking functions of the converter ............................................................................................ 225
7.9.2.1 Comparison of electrical braking methods................................................................................ 225
7.9.2.2 DC braking ................................................................................................................................ 228
7.9.2.3 Compound braking.................................................................................................................... 232
7.9.2.4 Dynamic braking ....................................................................................................................... 234
7.9.2.5 Braking with regenerative feedback to the line ......................................................................... 236
7.9.3
Automatic restart and flying restart ........................................................................................... 237
7.9.3.1 Flying restart – switching on while the motor is running ........................................................... 237
7.9.3.2 Automatic switch-on .................................................................................................................. 239
7.9.4
PID technology controller.......................................................................................................... 243
7.9.5
Load torque monitoring (system protection) ............................................................................. 244
7.9.6
Load failure monitoring via digital input..................................................................................... 246
7.9.7
Real time clock (RTC) ............................................................................................................... 247
7.9.8
Time switch (DTC) .................................................................................................................... 249
7.9.9
Temperature sensing using temperature-dependent resistors................................................. 250
7.9.10 Essential service mode ............................................................................................................. 252
7.9.11 Multi-zone control...................................................................................................................... 257
7.9.12 Cascade control ........................................................................................................................ 261
7.9.13 Bypass....................................................................................................................................... 265
7.9.14 Energy-saving mode ................................................................................................................. 269
7.9.15 Logical and arithmetic functions using function blocks ............................................................. 275
7.10
Switchover between different settings ...................................................................................... 279
Summary of Contents for SINAMICS G120 CU230P-2
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