Control mode U/f control or flux current control (FCC) Sensorless vector control
Properties
● Typical settling time after a speed change:
100 ms … 200 ms
● Typical settling time after a load surge: 500 ms
6SHHG
/RDG
0RWRU
WRUTXH
W
W
W
PV
● The control mode is suitable to address the
following requirements:
– Motor power ratings < 45 kW
– Ramp-up time 0 → rated speed (depending
on the motor power rating):
1 s (0.1 kW) … 10 s (45 kW)
– Applications with steady load torque without
load surges
● The control mode is insensitive with respect to
imprecise setting of the motor data
● Typical settling time after a speed change:
< 100 ms
● Typical settling time after a load surge: 200 ms
6SHHG
/RDG
0RWRU
WRUTXH
W
W
PV
● The control mode controls and limits the motor
torque
● Torque accuracy that can be achieved: ± 5% for
15% … 100% of the rated speed
● We recommend the control mode for the
following applications:
– Motor power ratings > 11 kW
– For load surges of 10% … >100% of the
rated motor torque
● The control mode is necessary for a ramp-up
time 0 → Rated speed (dependent on the rated
motor power): < 1 s (0.1 kW) … < 10 s (250 kW).
Application ex‐
amples
● Pumps, fans, and compressors with flow
characteristic
● Pumps and compressors with displacement
machines
Motors that can
be operated
Induction motors Induction and synchronous motors
Max. output fre‐
quency
550 Hz 240 Hz
Torque control Without torque control Torque control with and without higher-level speed
control
Commissioning
● In contrast to sensorless vector control, the
speed controller does not have to be set
Select the default setting for the interfaces of the converter that is suitable for your application.
Default setting of the interfaces (Page 82)
Figure 5-10 Minimum and maximum motor speed
Commissioning
5.4 Quick commissioning using the BOP-2 operator panel
SINAMICS G120XA converter
120 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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