Siemens SINAMICS G120C Operating Instructions Manual page 122

Commissioning
5.4 Commissioning with a PC
Control mode
Properties
•
•
•
•
Max. output fre-
quency
Torque control
Commissioning
•
118
U/f control or flux current control (FCC)
Typical correction time after a speed change:
100 ms ... 200 ms
Typical correction
time after a load
surge: 500 ms
The control mode
is suitable to ad-
dress the follow-
ing requirements:
– All power rat-
ings
– Ramp-up time
0 → Rated speed (dependent on the rat-
ed motor power):
1 s (0.1 kW) ... 10 s (18.5 kW)
– Applications with constant 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 vector control without encoder, a
speed controller does not have to be set.
Sensorless vector control
Typical correction time after a speed change:
•
< 100 ms
Typical correction
•
time after a load
surge: 200 ms
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 follow-
•
ing applications:
– Motor power ratings > 11 kW
– For load surges 10 % ... >100 % of the rat-
ed 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 (18.5 kW).
Speed control with lower-level torque control
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
240 Hz
SINAMICS G120C converter