Siemens SINAMICS G120C Operating Instructions Manual page 152

Commissioning
5.5 Quick commissioning with a PC.
Control mode
Properties
•
•
•
•
Max. output fre‐
quency
Torque control
Commissioning
•
150
U/f control or flux current control (FCC)
Typical settling time after a speed change:
100 ms ... 200 ms
Typical settling time after a load surge: 500 ms
The control mode is suitable to address the
following requirements:
– All motor power ratings
– Ramp-up time 0 → rated speed (depend‐
ing 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
550 Hz
Without torque control
Contrary to encoderless vector control, the
speed controller does not have to be set
Encoderless vector control
• Typical settling time after a speed change:
< 100 ms
• Typical settling time after a load surge: 200 ms
• 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 follow‐
ing 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).
Speed control with lower-level torque control
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
240 Hz
SINAMICS G120C Converters