Siemens SIRIUS 3RW44 Manual page 30

Installation, Connection and Branch Layout
3.2 Branch Layout
3.2.1 General
Disconnector
Switching element
3-4
Warning
Automatic restart.
May result in death, serious injury or damage to property.
The automatic reset mode must not be used in applications where the
unexpected restart of the motor may lead to personal injury or
damage to property.
The start command (e.g. by the PLC) must be reset before a reset
command, since an automatic restart is executed when a start
command is pending after the reset command. This especially applies
to motor protection tripping. For safety reasons it is recommended to
integrate the group error output (terminals 95 and 96) into the control.
A motor branch consists of at least a disconnector, a switching element and a
motor.
Protection functions should include line protection against short circuits and
overload protection for line and motor.
The disconnecting function with line protection against overload and short
circuits can be achieved by using, for example, a circuit-breaker or a fuse
disconnector.
(For fuse and circuit-breaker assignment, refer to Chapter 9.3.6 "Branch
Component Layout (Standard Circuit)" and Chapter 9.3.7 "Branch Component
Layout (Inside Delta Circuit)".
The 3RW44 soft starter provides the switching element function and motor
protection.
Danger
Dangerous voltage.
Danger to life or risk of serious injury.
If supply voltage is applied to the input terminals of the
soft starter, there may be dangerous voltages at the soft starter output
even without a start command! When working on the branch, it must
be disconnected using a disconnector (open isolating gap, e.g with
open switch disconnector)!
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 02