Siemens SINAMICS G120 Operating Instructions Manual page 158

Commissioning
5.4 Quick commissioning with a PC.
Select a suitable control mode
Control mode
Motors that can
be operated
Power Modules
that can be op-
erated
Application ex-
Pumps, fans, and compressors with flow char-
•
amples
acteristic
Wet or dry blasting technology
•
Mills, mixers, kneaders, crushers, agitators
•
Horizontal conveyor technology (conveyor
•
belts, roller conveyors, chain conveyors)
Basic spindles
•
Properties
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 address
the following re-
quirements:
–
–
–
Die Regelungsart is insensitive with respect to
•
imprecise setting of the motor data
Max. output
frequency
Closed-loop
torque control
Commissioning
Contrary to encoderless vector control, the
•
speed controller does not have to be set
158
U/f control or flux current control (FCC)
Induction motors
Motor power
ratings < 45 kW
Ramp-up time
0 → Rated speed (dependent on the rated
motor power): 1 s (0.1 kW) ... 10 s (45 kW)
Applications with constant load torque
without load surges
550 Hz
Without torque control
Sensorless vector control
Induction and synchronous motors
No restrictions
Pumps and compressors with displacement
•
machines
Rotary furnaces
•
Extruder
•
Centrifuge
•
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 fol-
•
lowing 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).
Torque control with and without higher-level speed
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
240 Hz
control