Siemens SIRIUS 3RW44 User Manual page 17

SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06
Motor torque
M
M
Direct
on-line
starting
M
Nom
1
2
3
M
1
Soft start
voltage ramp
M
2
Soft start
torque-controlled
M
3
Load (e.g. pump)
Figure 1-4: Reduced torque behavior of the 3-phase asynchronous motor during start-up
with the SIRIUS 3RW44 soft starter
Introduction
Motor speed
n
Nom
n
1-5