Soft Starters In Standard Circuits - Siemens Sirius 3RW44 System Manual

3.2.2 Soft starters in standard circuits

SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01
The SIRIUS 3RW44 soft starter is connected in the motor branch between the
disconnector or circuit-breaker and the motor.
The 3RW44 soft starter automatically detects the connection type of the soft
starter so this does not have to be explicitly set on the device. The detected
connection type can be shown on the starter under the menu item status
display/ connection type; in this case the display shows star/delta. If the
circuitry is faulty or the motor is not connected, the display shows unknown.
3/N/PE~ 50 Hz 400 V
L1
L2
L3
PE
U1 V1 W1
V2
W2 U2
Fig. 3-3: Block diagrams for 3RW44 soft starters in standard circuit
Notice
If a main or line contactor is used, this contactor must not be connected
between the soft starter and the motor or in the return line between the motor
and the soft starter. Otherwise the soft starter would not recognize the current
circuit version (standard circuit or inside delta circuit) and output an error
message: "missing load phase 1-3", i.e. ensure that the circuit is closed before
the 3RW44 is activated.
Installation, connection and branch layout
Q1
G1
M1
U1 V1 W1
V2
W2 U2
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