Siemens SINAMICS G120 Operating Instructions Manual page 146
Low voltage inverters
built-in units with cu250s-2 control units and
encoder evaluation
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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
5.4 Quick commissioning with a PC
Control mode U/f control or flux current control (FCC) Vector control without an encoder
Properties
● Responds to speed changes with
a typical settling time of
100 ms ... 200 ms
● Responds to load surges with a
typical settling time of 500 ms
● U/f and FCC are suitable for the
following cases:
–
For ramp-up times 0 → rated
speed > 2 s
–
For applications with
increasing load torque without
load surges
● The closed-loop control is
insensitive to inaccurate motor
data settings, e.g. the motor
temperature
Application
● Pumps, fans, and compressors
examples
with flow 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 oper‐
ated
Power Mod‐
ules that can
be operated
Max. output
frequency
Torque con‐
Without torque control
trol
144
Induction motors
550 Hz
● The vector control responds to speed changes with a typical
settling time of < 100 ms.
● The vector control responds to load surges with a typical settling
time of 200 ms
● Vector control is required in the following cases:
–
For ramp-up times 0 → rated speed < 2 s
–
For applications with fast and high load impulses
● Torque accuracy that can be
achieved: ± 5% for 15 % ...
100 % of the rated speed
● Pumps and compressors with
displacement machines
● Rotary furnaces
● Extruder
● Centrifuges
Induction and synchronous motors
No restrictions
Speed control with lower-level torque control
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Vector control with an encoder
● The control extends the
torque accuracy of ± 5 %,
also for speeds < 15 % of the
rated speed.
● Vertical conveyor
technology (conveyor belts,
roller conveyors, chain
conveyors)
● Escalators/moving stairways
● Lifter/lowerer
● Elevators
● Gantry cranes
● Cable railways
● Stacker cranes
240 Hz
Converter with the CU250S-2 Control Units
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