Siemens SIRIUS 3RW55 - A.3.2 3 RW55 Soft Starters in Inline Circuit and Stopping Function, DC Braking with 2 Braking Contactors

Example circuits
A.3 Special applications
SIRIUS 3RW55 soft starter
214 Manual, 08/2018, A5E35630887002A/RS-AB/002
A.3.2
3RW55 soft starters in inline circuit and stopping function, DC braking with 2
braking contactors
WARNING
Automatic restart.
Can cause death or serious injury.
If a starting command is pending, a restart will be triggered automatically after the reset.
This particularly applies if the motor protection has tripped. Dangerous states of the system
can result.
Reset the start command (e.g. via the PLC or switch) before performing a reset.
To do this, for example, link the group error output (terminals 95 and 96) into the control.
Use the "DC braking with external braking contactor" function if applications with small mass
inertias (centrifugal masses) are to be stopped (J
load
≤ 5 x J
motor
).
If you select the stopping function "DC braking with external braking contactor", you
additionally require 2 braking contactors. Set the output 1 to "DC braking contactor". If you
select the stopping function "Dynamic DC braking without contactor", you do not require a
braking contactor.
For more information, see Chapter DC braking with external braking contactor (Page 102)
Requirements
● Parameterization required