Siemens SIRIUS 3RW44 - Page 17

Introduction
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04
1-5
Figure 1-4:Reduced torque behavior of the 3-phase asynchronous motor during start-up
with the SIRIUS soft starter 3RW44
005_Drehmomentkurven mit Sanftstarter.wmf
1
2
3
1
2
3
n
Motor speed
n
Nom
Motor torque
M
M
Nom
M
Soft start
voltage ramp
M
Soft start
torque-controlled
M
Load (e.g. pump)
M
Direct
on-line
starting