3RW303. datasheet(13/40 Pages) SIEMENS

13 / 40 page

How is the SIRIUS 3RW40 set?

Like with the SIRIUS 3RW30, the starting

voltage, ramp-up and ramp-down time of

the voltage ramp, as well as the current

limiting, can be comfortably set via finely

adjustable rotary potentiometers. The

nominal motor current, tripclass and

reset of the motor overload function are

adjusted via potentiometers and buttons,

as is familiar from the SIRIUS overload

relays.

What are its outstanding characteristics?

The SIRIUS 3RW40 comes with the new

patented control principle “polarity

balancing” for the avoidance of DC

components in two-phase-controlled

soft starters. With two-phase-controlled

soft starters, the current resulting from

the overlapping of the two controlled

phases flows in the uncontrolled phase.

For physical reasons, this results in an

asymmetric distribution of the three

phase currents during the motor’s start-

up process. Even though this distribution

cannot be influenced, it is uncritical in

most applications. However, besides this

asymmetry, the power semiconductors’

control during the two controlled phases

also produces the above-mentioned DC

components, which may lead to a loud

motor noise with starting voltages lower

than 50%. “Polarity balancing” reliably

eliminates these DC components during

the start-up phase. It generates an even

motor start-up in terms of speed, torque

and current rise. The acoustic quality

of the start-up process almost reaches

the quality of a three-phase-controlled

start-up. This is made possible by the

continuous dynamic alignment and

Is thermistor motor protection

available

Device versions with thermistor motor

protection evaluation are available up

to a rating of 55 kW (with 400 V). A

“Thermoclick” measuring sensor or PTC

(type A) can be directly connected. In

addition to thermal motor overload, wire

breakage and short circuit in the sensor

circuit effect a disconnection of the soft

starter.

What about reset options?

After the soft starter has tripped,

various reset options are available, like

for intrinsic device and motor overload

protection: manual or via the reset

button, automatic or (up to 55 kW)

remotely via short-term control voltage

interruption.

Is replacement easy?

Yes, also the 3RW40 is equipped with

removable control terminals. The

wiring on the terminal thus remains

intact (“permanent wiring”) in case of

replacement and the terminals are simply

snapped onto the new 3RW40, which

saves a considerable amount of time.

How about accessories?

We offer a comprehensive range of

accessories for our soft starters, e.g.

box terminal blocks, accessories for

mechanical reset and a module for

remote reset (for ratings > 75 kW) as well

as a sealing cover and easy-to-mount

terminal covers for optimum touch

protection.

Furthermore, snap-on fans are available

for the devices up to 55 kW which

facilitate mounting of the SIRIUS 3RW40

in almost any installation position

and support higher switching duties.

In addition, connection modules for

electrical and mechanical connections

between circuit breaker and soft starter

as well as labeling strips from the SIRIUS

range are available.

balancing of current half-waves with

different polarity during the motor

start-up.

Does the SIRIUS 3RW40 feature

additional protective functions?

The SIRIUS 3RW40 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.

The integrated motor overload protection

in accordance with IEC 60 947-4-2 makes

an additional overload relay unnecessary,

to save space in the control cabinet and

reduce the wiring costs in the feeder. The

overload tripclass can be variably set via a

4-level rotary potentiometer. In addition,

intrinsic device protection prevents

the thyristors’ thermally overloading

and resulting defects of the power

components. 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.

Does the SIRIUS 3RW40 offer

diagnostics options?

Yes, thanks to integrated status and fault

monitoring. LEDs provide information on

the operating state as well as possible

faults, e.g. impermissible release time

(CLASS setting), mains or phase failure,

missing load, thermal overload or device

fault. The two integrated output relays

also indicate the operating state and fault

signals.

3RW303. Datasheet(PDF) 13 Page - Siemens Semiconductor Group

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