Functions Of The Inputs; Start Input (Terminal 1) On 3Rw30 And 3Rw40 2 To 3Rw40 4; Start Input (Terminal 3) On 3Rw40 5 And 3Rw40 7 - Siemens SIRIUS 3RW30 Manual

Functions

5.5 Functions of the inputs

5.5 Functions of the inputs
5.5.1

Start input (terminal 1) on 3RW30 and 3RW40 2 to 3RW40 4

Rated control voltage is present at terminal A1 / A2: The startup process of the soft starter
begins when a signal is present at terminal 1 (IN). The starter operates until the signal is
removed again.
If a ramp-down time is parameterized (3RW40 only), a soft stop starts as soon as the signal is
removed.
The potential of the signal at terminal 1 must correspond to the potential of the rated control
voltage at terminal A1 / A2.
For recommended circuits, e.g. control by means of pushbuttons, contactor contacts, or a
PLC, refer to chapter Typical circuit diagrams [Page 167].
5.5.2

Start input (terminal 3) on 3RW40 5 and 3RW40 7

Rated control voltage is present at terminal A1 / A2: The startup process of the soft starter
begins when a signal is present at terminal 3 (IN). The starter operates until the signal is
removed again. If a ramp-down time is parameterized, a soft stop starts as soon as the signal
is removed.
The 24 V DC control voltage supplied by the soft starter must be taken from terminal 1 (+) as
voltage for the signal at terminal 3.
If you select direct control by a PLC, the "M" of the PLC's reference potential must be
connected to terminal 2 (-).
For recommended circuits, e.g. control by means of pushbuttons, contactor contacts, or a
PLC, refer to chapter Typical circuit diagrams [Page 167].
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SIRIUS 3RW30 / 3RW40
Manual, 01/2010, 535 1995-02 DS01