Siemens SIRIUS 3RW52 - Functions; Soft starting

SIRIUS 3RW52 Soft Starter
Manual, 01/2019, A5E35630451002A/RS-AD/004
93
Functions
7
7.1 Soft starting
Operating principle
A voltage ramp is used to implement soft starting. The 3RW52 soft starter increases the
motor voltage from a parameterizable starting voltage to the line voltage within a definable
ramp-up time.
①
Voltage ramp with short ramp-up time t1
②
Voltage ramp with long ramp-up time t2
U
rated
Line voltage
U
S
Parameterizable starting voltage
t
1
Short ramp-up time
t
2
Long ramp-up time