3 Functions Issue 07/04
MICROMASTER 420 Operating Instructions
36 6SE6400-5AA00-0BP0
3.7 Communication ....................................................................................................... 95
3.7.1 USS bus configuration via COM link (RS485) ........................................................ 98
3.8 Fixed frequencies (FF)............................................................................................ 99
3.9 Motorized potentiometer (MOP) ........................................................................... 102
3.10 JOG....................................................................................................................... 104
3.11 PID controller (technological controller)................................................................ 106
3.11.1 PID motorized potentiometer (PID-MOP) ............................................................. 108
3.11.2 PID fixed setpoint (PID-FF)................................................................................... 109
3.12 Setpoint channel ................................................................................................... 110
3.12.1 Summation and modification of the frequency setpoint (AFM)............................. 110
3.12.2 Ramp-function generator (RFG) ........................................................................... 112
3.12.3 OFF/braking functions .......................................................................................... 115
3.12.4 Manual / automatic operation ............................................................................... 117
3.13 Motor holding brake (MHB)................................................................................... 119
3.14 Electronic brakes .................................................................................................. 122
3.14.1 DC braking ............................................................................................................ 122
3.14.2 Compound braking................................................................................................ 125
3.15 Automatic restart................................................................................................... 127
3.16 Flying restart ......................................................................................................... 129
3.17.1 Vdc_max controller ............................................................................................... 131
3.18 Monitoring functions / messages .......................................................................... 133
3.18.1 General monitoring functions / messages ............................................................ 133
3.19 Thermal motor protection and overload responses ............................................. 135
3.19.1 Thermal motor model............................................................................................ 135
3.19.2 PTC temperature sensor ...................................................................................... 137
3.20 Power module protection ...................................................................................... 138
3.20.1 General overload monitoring ................................................................................ 139
3.20.2 Thermal monitoring functions and overload responses........................................ 140
3.21 Open-loop/closed-loop control technique ............................................................. 143
3.21.1 V/f control.............................................................................................................. 143
3.21.1.1 Voltage boost ........................................................................................................ 145
3.21.1.2 V/f open-loop control with flux current control (FCC)............................................ 147
3.21.1.3 Slip compensation................................................................................................. 148
3.21.1.4 V/f resonance damping......................................................................................... 149
3.21.1.5 Current limiting (Imax controller)........................................................................... 150
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