Siemens SIRIUS 3RW55 - Soft Starting with Voltage Ramp

Functions
7.2 Start-up
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
83
7.2.3
Soft starting with voltage ramp
Operating principle
A voltage ramp is used to implement soft starting. The 3RW55 soft starter increases the
motor voltage from a parameterizable starting voltage to the line voltage within a definable
ramp-up time.
Application
● Conveyor belts
● Systems in which a startup of the drive without interfering jerky movements is required.
Diagrams
①
Voltage ramp with short ramp-up time t
1
②
Voltage ramp with long ramp-up time t
2
U
rated
Line voltage
U
S
Parameterizable starting voltage
t
1
Short ramp-up time
t
2
Long ramp-up time