Siemens SINAMICS G120C USS/MB Operating Instructions Manual page 131

Control mode
Properties ● Typical settling time after a speed change:
● Typical settling time after a load surge: 500 ms
● The control mode is suitable to address the
● The control mode is insensitive with respect
Max. output fre‐
quency
Torque control
Commissioning
● Contrary to vector control without encoder, a
Select the default setting for the interfaces of the inverter that is suitable for your application.
Figure 5-9
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
U/f control or flux current control (FCC)
100 ms ... 200 ms
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
to imprecise setting of the motor data
550 Hz
Without torque control
speed controller does not have to be set.
Default setting of the interfaces (Page 91)
Minimum and maximum motor speed
5.4 Quick commissioning using the BOP-2 operator panel
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
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).
Speed control with lower-level torque control
Commissioning
240 Hz
131