3RW445. datasheet(15/40 Pages) SIEMENS

15 / 40 page

How is the SIRIUS 3RW44 commissioned

and operated?

Commissioning of the SIRIUS 3RW44 is

particularly fast and easy, thanks to a

modern and ergonomic menu system.

This is facilitated by a keypad with a

menu-driven, multi-line graphical display

with background illumination. The

optimized motor start-up and stopping

can be realized rapidly, easily and safely

via only few settings in several pre-

selected languages. 4-key operation and

plain text displays on every menu item

ensure transparent parameterization and

operation at all times. Via the display

field, measuring and operating values, as

well as warning and fault messages, are

continuously displayed during operation

and with the control voltage connected. In

addition, an external display and operator

module can be connected to the soft

starter via a connection cable, for example

to read actual values directly from the

control cabinet door.

Does the SIRIUS 3RW44 feature

additional protective functions?

The SIRIUS 3RW44 is equipped with

optimum functionality as standard.

An integrated bypass contact system

reduces the soft starter’s heat loss during

operation. This reliably prevents heating

of the switching device‘s environment.

Moreover, it features an internal device

overload protection against thermal

overload of the power section’s thyristors,

e.g. caused by impermissibly high starting

operations.

The wiring costs for installation of an

additional motor overload relay are

eliminated as the SIRIUS 3RW44 also

masters this function. Whether settable

release times or thermistor motor

protection: With SIRIUS 3RW44, you are

always on the safe side! Optionally, the

thyristors can also be protected against

short circuit with SITOR semiconductor

fuses. Also inrush current peaks are

reliably eliminated thanks to settable

current limiting.

Is the SIRIUS 3RW44 communication-

capable?

Yes, the SIRIUS 3RW44 can be optionally

retrofitted with a PROFIBUS DP module.

Thanks to its communication capability

as well as its control inputs and

programmable relay outputs, it can be

very easily and rapidly integrated in

superior control systems.

What are the advantages in terms of

power loss?

Normally, approx. 3 W heat load are

generated per every ampere flowing

through an actuated thyristor. For motors

with 250 kW (with 400 V), this results

in a heating power of roughly 1500 W

in the switching device‘s environment.

The SIRIUS 3RW44 coolly handles

these hot conditions. As a standard, all

versions are equipped with mechanical

bypass contacts, which bridge the

thyristors after detected motor start-

up. This considerably reduces the heat

loss occurring during the soft starter’s

nominal operation. The intelligent hybrid

concept, which electronically starts

the motor via thyristors and operates

it electro-mechanically via contactor

contacts during rated operation,

improves the feeder’s overall efficiency

and additionally reduces the costs for

control cabinet dimensioning.

What if lower speeds are required?

For positioning and set-up tasks, a creep

speed function allows for the motor’s

control in both directions of rotation

– with reduced torque and settable low

speed.

What about stopping quickly?

For the fast shutdown of driving loads,

a new, combined DC brake function is

offered for the SIRIUS 3RW44.

How about accessories?

We offer a comprehensive range of

accessories for our soft starters, e.g. an

external display and operator module for

installation in the control cabinet door or

the plug-on PROFIBUS DP module.

Circuit breaker and soft starter as well as

labeling strips from the SIRIUS range are

available.

Furthermore, easy-to-mount box terminal

blocks and sealing covers from the SIRIUS

portfolio are available for optimum touch

protection.

3RW445. Datasheet(PDF) 15 Page - Siemens Semiconductor Group

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