Siemens 420 manual Functions Issue 07/04

3 Functions Issue 07/04

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

MICROMASTER 420	Operating Instructions
36	6SE6400-5AA00-0BP0