Functions; Soft Starting - Siemens SIRIUS 3RW52 Manual

Functions

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
②
U
rated
U
S
t
1
t
2
SIRIUS 3RW52 Soft Starter
Manual, 01/2019, A5E35630451002A/RS-AD/004
Voltage ramp with short ramp-up time t1
Voltage ramp with long ramp-up time t2
Line voltage
Parameterizable starting voltage
Short ramp-up time
Long ramp-up time
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