Soft Starter With Contactor Disconnector (Main Contactor) - Siemens Sirius 3RW44 System Manual

Installation, connection and branch layout

3.2.4 Soft starter with contactor disconnector (main contactor)

3-8
If galvanic decoupling is required, a motor contactor can be installed between
the soft starter and the disconnector, or a fault output relay can be used.
(Refer to Chapter 9.3 Technical data for the contactor assignment)
3/N/PE~ 50 Hz 400 V
L1
L2
L3
PE
U1 V1 W1
W2 U2 V2
Fig. 3-6: Block diagram of branch with optional main contactor/contactor disconnector
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: "load phases 1-3 missing".
Q1
K1
G1
M1
U1 V1 W1
W2 U2 V2
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01