Siemens SINAMICS G120 Operating Instructions Manual page 162
Low voltage converters
chassis devices with cu240b-2 and cu240e-2
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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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Commissioning
5.5 Quick commissioning with a PC
Select a suitable control mode
Control mode
Characteristics
● Typical settling time after a speed change:
100 ms ... 200 ms
● Typical settling time after a sudden load
change: 500 ms
● The control mode is suitable to address the
following requirements:
–
–
–
● Die Regelungsart is insensitive with respect to
imprecise setting of the motor data
Application ex‐
● Pumps, fans, and compressors with flow
amples
characteristic
● Wet or dry blasting technology
● Mills, mixers, kneaders, crushers, agitators
● Horizontal conveyor technology (conveyor
belts, roller conveyors, chain conveyors)
● Basic spindles
Motors that can
be operated
Power Modules
that can be oper‐
ated
Max. output fre‐
quency
Closed-loop tor‐
que control
Commissioning
● Contrary to encoderless vector control, the
speed controller does not have to be set
162
U/f control or flux current control (FCC)
Motor power ratings < 45 kW
Ramp-up time 0 → rated speed (depending
on the motor power rating):
1 s (0.1 kW) ... 10 s (45 kW)
Applications with continuous load torque
without sudden load changes
Induction motors
550 Hz
Without torque control
Sensorless vector control
● Typical settling time after a speed change:
< 100 ms
● Typical settling time after a sudden load
change: 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
following 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).
● Pumps and compressors with displacement
machines
● Rotary furnaces
● Extruders
● Centrifuges
Induction and synchronous motors
No restrictions
Torque control with and without higher-level speed
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
240 Hz
control
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