Siemens SINAMICS G120 Operating Instructions Manual page 169

Select a suitable control mode
Control mode U/f control with linear or square-law characteristic
Closed-loop con‐
● Typical settling time after a speed change:
trol characteristics
● Typical settling time after a load surge: 500 ms
● The control mode is suitable to address the
● The control mode is insensitive with respect
Application exam‐ ● Pumps, fans, and compressors with flow
ples
Motors that can be
operated
Power Modules
that can be operat‐
ed
Max. output fre‐
quency
Commissioning
● Contrary to vector control, no speed controller
Select the default setting for the interfaces of the inverter that is suitable for your application.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Flux current control (FCC)
100 ms ... 200 ms
following requirements:
– 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 increasing load torque
without load surges
to imprecise setting of the motor data
characteristic
Induction motors
550 Hz
has to be set
Default setting of the interfaces (Page 115)
5.4 Quick commissioning using the BOP-2 operator panel
Encoderless vector control
● Typical settling time after a speed change:
< 100 ms
● Typical settling time after a load surge: 200 ms
● The vector control controls and limits the motor
torque
● Torque accuracy that can be achieved: ± 5% for
15 % ... 100 % of the rated speed
● We recommend vector control for the following
applications:
– Motor power ratings > 11 kW
– For load surges 10 % ... >100 % of the rated
motor torque
● The vector control 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
Induction, synchronous and reluctance motors
No restrictions
150 Hz with PM330 Power Module
Commissioning
240 Hz
169