Siemens SIRIUS 3RW55 Equipment Manual page 26

Description
3.3 Operating principle
Canceling the switch-on command (t
The power semiconductors also ensure that the motor coasts down smoothly to a stop. As long
as the stopping time is active (t
the motor to actually coast down to a standstill (t
①
②
t
1
t
2
t
3
t
4
Functions of the 3RW55 and 3RW55 Failsafe soft starters
Note the information in chapter Firmware update (Page 22).
• Parameterizable soft starting for a smooth drive start-up
• Parameterizable soft stopping for a smooth drive stop
• Parameterizable current limiting for avoiding current peaks
• Integrated electronic motor overload protection with adjustable trip class (OFF,
CLASS 10A, 10E, 20E, 30E)
• Integrated intrinsic device protection protects the 3RW55 and 3RW55 Failsafe soft starters
from overload
• Extended complete motor protection by means of thermistor motor protection for
connection of a temperature sensor
• Extended operating and diagnostic functions provided by the High Feature 3RW5 HMI
• Analog output for displaying a set measured value using an external evaluation unit
• Automatic parameterization simplifies system commissioning
26
Speed
Voltage
Motor start-up with set starting voltage U
Rated operating speed n reached
e
End of the set ramp-up time
(t -t )
3 1
Switch-on command is canceled, motor is
switched off
) activates the stopping mode and the motor is shut down.
4
to t ), power is still supplied to the motor. It may take longer for
4 5
).
6
t End of the set stopping time
5
(t
t Motor at standstill
6
U Set starting voltage
S S
U Rated operational voltage
e
n Rated operating speed of the motor
e
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
-t )
5 4
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters