Siemens SINAMICS G120C Operating Instructions Manual page 137
Low voltage converters
Hide thumbs
Also See for SINAMICS G120C:
- Operating instructions manual (470 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 pages)
Table of Contents
Advertisement
Control mode
U/f control or flux current control (FCC)
Properties
•
Typical settling time after a speed change:
100 ms ... 200 ms
•
Typical settling time after a load surge: 500 ms
•
The control mode is suitable to address the fol‐
lowing requirements:
– Motor power ratings < 45 kW
– Ramp-up time 0 → rated speed (depending
– Applications with steady load torque without
•
The control mode is insensitive with respect to
imprecise setting of the motor data
Application ex‐
•
Pumps, fans, and compressors with flow charac‐
amples
teristic
•
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
Max. output fre‐
quency
Torque control
Commissioning
•
In contrast to sensorless vector control, the
speed controller does not have to be set
Select the default setting for the interfaces of the converter that is suitable for your
application.
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
on the motor power rating):
1 s (0.1 kW) ... 10 s (45 kW)
load surges
Induction motors
550 Hz
Without torque control
Default setting of the interfaces (Page 92)
5.4 Quick commissioning using the BOP-2 operator panel
Sensorless vector control
•
Typical settling time after a speed change:
< 100 ms
•
Typical settling 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 follow‐
ing 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 (132 kW).
•
Pumps and compressors with displacement ma‐
chines
•
Rotary furnaces
•
Extruder
•
Centrifuges
Induction and synchronous motors
Speed control with lower-level torque control
Commissioning
240 Hz
135
Advertisement
Table of Contents
