SIRIUS System Manual
GWA 4NEB 430 0999-02b
8-1
8
3RW3 semiconductor motor control unit
(soft starter)
Section Subject Page
8.1 Specifications/regulations/approvals 8-3
8.2 Device description 8-5
8.2.1 Physical principles 8-6
8.2.2 General device description 8-10
8.2.3
Comparison of the 3RW3 semiconductor motor cont-
rol unit (soft starter) with the SIKOSTART 3RW22
motor control units
8-14
8.2.4
Comparison of the 3RW3 semiconductor motor cont-
rol unit (soft starter) with the 3RA star-delta combina-
tion
8-16
8.2.5 Notes on configuration 8-16
8.3 Application and use 8-18
8.3.1 Areas of application and criteria for selection 8-18
8.3.2 Installation guidelines 8-18
8.3.3 Overview tables: correction factors 8-21
8.3.3.1 3RW30/31 soft starters in a stand-alone installation 8-21
8.3.3.2
3RW30/31 soft starters in combination with the 3RV1
circuit breaker
8-22
8.3.3.3
Combining the 3RT contactor with the 3RU1 thermal
overload
relay and 3RW3 soft starter
8-24
8.3.3.4
Combining the 3RT contactor with the 3RB10 electro-
nic overload relay and 3RW3 soft starter
8-26
8.3.4 Circuit examples 8-29
8.3.5 Commissioning 8-30
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