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

3.2.2 Soft Starters in Standard Circuits

SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04
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 read on the starter under the menu item "Status display/
Connection type". In this case, the
display reads "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
Q11
U1 V1 W1
V2
W2 U2
Figure 3-3:Block diagrams for 3RW44 soft starters in standard circuits
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 would output the error
message: "Missing load phase 1-3", thereby ensuring 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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