Control mode U/f control or flux current control (FCC) Encoderless 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:
– All motor power ratings
– Ramp-up time 0 → rated speed
(depending on the motor power rating):
1 s (0.1 kW) … 10 s (45 kW)
– Applications with increasing 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
● Typically achieves a torque accuracy: ± 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 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 (132 kW).
Max. output fre‐
quency
550 Hz 240 Hz
Torque control Without torque control Speed control with lower-level torque control
Commissioning
● Contrary to vector control without encoder, a
speed controller does not have to be set.
Commissioning
5.5 Quick commissioning with a PC
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 147
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