Siemens MICROMASTER 440 Operating Instructions Manual page 49

Issue 10/06
3.18 Closed-loop Vdc control........................................................................................ 215
3.18.1 Vdc_max controller ............................................................................................... 215
3.18.2 Kinetic buffering (Vdc_min controller)................................................................... 218
3.19 Positioning down ramp ......................................................................................... 219
3.20 Monitoring functions / messages .......................................................................... 221
3.20.1 General monitoring functions / messages ............................................................ 221
3.20.2 Load torque monitoring......................................................................................... 223
3.21 Thermal motor protection and overload responses .............................................. 227
3.21.1 Thermal motor model............................................................................................ 229
3.21.2 Temperature sensor.............................................................................................. 230
3.22 Power module protection ...................................................................................... 232
3.22.1 General overload monitoring ................................................................................ 232
3.22.2 Thermal monitoring functions and overload responses........................................ 233
3.23 Open-loop/closed-loop control technique ............................................................. 235
3.23.1 V/f control.............................................................................................................. 235
3.23.1.1 Voltage boost ........................................................................................................ 237
3.23.1.2 Slip compensation................................................................................................. 239
3.23.1.3 V/f resonance damping......................................................................................... 240
3.23.1.4 V/f open-loop control with flux current control (FCC)............................................ 241
3.23.1.5 Current limiting (Imax controller)........................................................................... 242
3.23.2 Vector control........................................................................................................ 243
3.23.2.1 Vector control without speed encoder (SLVC) ..................................................... 245
3.23.2.2 Vector control with speed encoder (VC) ............................................................... 247
3.23.2.3 Speed controller.................................................................................................... 248
3.23.2.4 Closed-loop torque control.................................................................................... 253
3.23.2.5 Limiting the torque setpoint................................................................................... 254
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
3 Functions
49