Figure 8-9: Load And Motor Torques And Motor Terminal Voltage For Operation With Soft Starter - Siemens sirius System Manual

Criteria for selection
SIRIUS System Manual
GWA 4NEB 430 0999-02b
M
M
starting
M
SIRIUS3R soft starter
M
starting
with
SIRIUS3R
Soft starter
U
U
e
U
S

Figure 8-9: Load and motor torques and motor terminal voltage for operation with soft starter

Note
In the case of the SIRIUS 3RW30/31 soft starters, the corresponding soft
starter must be selected on the basis of the rated current for the motor (the
rated current of the soft starter must be ≥ the rated current for the motor).
The 3 potentiometers on the starter are for setting the starting voltage, the
starting time, and the coasting-down time.
The soft starter is correctly set when the motor starts smoothly and runs up
rapidly to its rated speed.
Ramp times of up to 20 seconds can be set.
3RW3 semiconductor motor control unit
M
motor
with
motor
M
B
t
R
M
load
M = accelerating torque
B
of the motor
n
t
8-17