Parameters
Number
Name
Factory setting
p0010
Drive commissioning parameter filter
1
p0230
Drive filter type, motor side
0
p0235
Number of motor reactors in series
1
p0350[M]
Motor stator resistance, cold
0 Ω
p0352[M]
Cable resistance
0 Ω
For additional information on parameters, please refer to the parameter list.
6.7.2
V/f control
6.7.2.1
U/f control
Overview
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In the "Flux Current Control (FCC)" U/f version, the converter controls the motor current (starting
current) at low speeds.
Figure 6-67
Simplified function diagram of the U/f control
The U/f control is a speed feedforward control with the following properties:
● The converter sets the output voltage on the basis of the U/f characteristic.
● The output frequency is essentially calculated from the speed setpoint and the number of
pole pairs of the motor.
● The slip compensation corrects the output frequency depending on the load and thus
increases the speed accuracy.
● The omission of a control loop means that the U/f control is stable in all cases.
● In applications with higher speed accuracy requirements, a load-dependent voltage boost
can be selected (flux current control, FCC)
For operation of the motor with U/f control, you must set at least the following subfunctions
appropriate for your application:
● V/f characteristic
● Voltage boost
Advanced commissioning
6.7 Motor control
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
377
Содержание SINAMICS G120X
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