Siemens SIRIUS 3RW55 Equipment Manual page 97

Motor connection type
In the 3RW5 HMI High Feature, the menu item is "Type of connection".
Motor connection type
Automatic detection
Standard
Inside-delta
Example: A 3RW55 soft starter 720 A can be used in standard (inline) circuit for 400 kW motors,
in inside-delta circuit for 710 kW motors.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Description
The 3RW55 or 3RW55 Failsafe soft starter detects the motor con‐
nection type (standard (inline) circuit or inside-delta circuit) auto‐
matically if the main supply voltage (operational voltage) is applied
and the motor is connected to the 3RW55 or 3RW55 Failsafe soft
starter. Thus no parameterization of the motor connection type is
necessary.
The connections of the 3RW55 or 3RW55 Failsafe soft starter are
wired into the motor feeder between the motor starter protector
and the motor.
The inside-delta circuit makes it possible to increase the operable
motor power of the individual 3RW55 or 3RW55 Failsafe soft start‐
ers by a factor of root 3.
Operation in inside-delta circuit is only possible for operating vol‐
tages up to 600 V.
Parameter assignment
6.5 Motor parameters
97