Soft Starter In Inside Delta Circuits - Siemens Sirius 3RW44 System Manual

Installation, connection and branch layout

3.2.3 Soft starter in inside delta circuits

Prerequisite
Example
3-6
A motor whose windings can be connected in a delta circuit where line voltage
prevails.
Supply voltage:
Rated motor current:
Current via soft starter in inside delta circuit:
Selected soft starter in inside delta circuit:
Fig. 3-4: Name plate of a 22 kW motor
Here the SIRIUS 3RW44 soft starter can be dimensioned to match the current
flowing in the motor section (58 % of the conductor current) by connecting it in
the delta winding of the motor. This requires at least 6 motor lines.
The 3RW44 soft starter automatically detects how it is connected so the
connection type does not have to be explicitly set on the device. The detected
connection type can be read off on the starter under the menu item Status
display/ connection type, in this case the display reads Inside delta circuit. If
the circuitry is faulty or the motor is not connected, the display reads Unknown.
Notice
The rated motor current given on the name plate should always be set in the
quickstart menu or in the motor adjustment menu item. This setting is
independent of the type of connection of the soft starter.
Value to be set in the above example for a supply voltage of 400 V, e.g. 40.5 A.
400 V
40.5 A
approx. 24 A
3RW44 22
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SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01