Totally Integrated Automation - Automation Technology - Siemens

Motor and soft starters
© Siemens AG 2011
For applications in the control cabinet –
SIRIUS 3RW44 soft starter for High Feature applications
Drive technology
With its high-end functionality, the SIRIUS
3RW44 all-rounder handles even complex
ramp-up and ramp-down operations easily
and, above all, smoothly. Thanks to innovative
torque control, the device can be used
for drives up to 710 kW (at 400 V) with inline
circuits or up to 1200 kW (at 400 V) with
inside-delta circuits. The functions have
been specially designed to offer maximum
user friendliness.
• Its compact design means that it saves space and is easy to operate in
the control cabinet
• SIRIUS 3RW44 is a cost-effective alternative to a frequency converter
when it comes to starting/stopping motors without speed control
• Torque control and variable current limitation for challenging starting
conditions
• The prevention of torque surges and current peaks when motors are
started/stopped helps minimize the cost of dimensioning the switchgear
and maintaining the machines
• Whether you are using an in-line or inside-delta circuit, SIRIUS 3RW44
can help you save space and cut costs
• Commissioning is quick and effortless thanks to ergonomic,
state-of-the-art user prompting and a menu-assisted, multi-row
graphical display *)
• An integrated jumper contact system minimizes the thermal power
loss of the soft starter during operation, thereby ensuring that the
area around the switchgear is not subject to excessive warming
• SIRIUS 3RW44 is equipped with integrated device overload protection,
which ensures that the thyristors in the power unit are not subject to
thermal overload (e.g. due to an excessive number of closing operations)
• No wiring needs to be carried out to install an additional motor overload
relay – SIRIUS 3RW44 takes care of this too
• Variable current limitation reliably prevents inrush peaks
• The 3RW44 can be integrated into the overlying control level using
the optional PROFIBUS DP communication module - this means that
parameterization, processing of measured values and operating values
as well as control of the soft starter are all possible over PROFIBUS
*)
The optional Soft Starter ES parameterization and evaluation software is available
for easy commissioning with the PC (see Chapter 5)
Siemens TIA Product Guide 2011
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