Siemens sinamics G120 Operating Instructions Manual page 131

Select a suitable control mode
Control mode U/f control or flux current control
Motors that
can be oper-
ated
Power Mod-
ules that can
be operated
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
•
Properties
Responds to speed changes with
•
a typical settling time of
100 ms ... 200 ms
Responds
•
to load
surges
with a typ-
ical set-
tling time
of 500 ms
U/f and
•
FCC are
suitable
for the fol-
lowing cases:
– For ramp-up times 0 → rated
speed > 2 s
– For applications with increas-
ing load torque without load
impulses
The closed-loop control is insensi-
•
tive to inaccurate motor data set-
tings, e.g. the motor temperature
Max. output
frequency
Torque con- Without torque control
trol
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
(FCC)
Induction motors
550 Hz
Vector control without an encod-
er
Induction and synchronous motors
PM240, PM240-2, PM340
Pumps and compressors with
•
displacement machines
Rotary furnaces
•
Extruder
•
Centrifuges
•
The vector control responds to
•
speed changes with a typical set-
tling time of < 100 ms.
The vector control responds to
•
load surges with a typical settling
time of 200 ms
The 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
Speed control with lower-level torque control
Commissioning
5.3 Quick commissioning with a PC.
Vector control with an encoder
Vertical conveyor technolo-
•
gy (conveyor belts, roller
conveyors, chain convey-
ors)
Escalators/moving stairways
•
Lifter/lowerer
•
Elevators
•
Gantry cranes
•
Cable railways
•
Stacker cranes
•
The control extends the
•
torque accuracy ± 5 %, also
for speeds < 15 % of the
rated speed.
240 Hz
131