3RW442. datasheet(5/40 Pages) SIEMENS

5 / 40 page

What is the operating principle of soft

starters?

Soft starters limit the starting current

and starting torque. This reliably prevents

both mechanical stress as well as line

voltage dips. The motor voltage is

reduced through phase angle control and

increased from an adjustable starting

voltage up to the line voltage within

the ramp time. Thanks to the step-free

control of the supply voltage, the motor

is adjusted to the driven machine’s

load behavior. Mechanical operating

equipment is accelerated in a particularly

gentle manner, which positively

influences its operating behavior and

prolongs its service life. In short: Soft

starting and stopping protects the

connected devices and ensures a smooth

production flow.

Can load feeders be assembled with

soft starters?

Of course. Fuseless load feeders of small

size can be effortlessly assembled with

circuit breakers, e.g. the SIRIUS 3RV.

Thanks to the integrated overload

functionality, also fused feeders can be

realized1) in a rapid and space-saving

manner.

How is the connection realized?

Connection is realized in the same

manner as with all other SIRIUS devices

for the control cabinet: Either using

screw-type or spring-loaded terminals.

Further connection systems can be

employed subject to availability.

What about communication?

As a matter of course, our soft starters

are able to communicate with the outside

world. With our high-feature soft starters,

this is realized with a communication

module for PROFIBUS DP.

Soft Starting of

Three-Phase Motors

SIRIUS soft starters –

advantages at a glance

Soft start and soft stop

Smooth starting, without steps

Reduced current peaks

Avoidance of line voltage fluctuations during

start-up

Reduced load on the power supply system

Reduced mechanical load in the drive

Considerable space savings and reduced

wiring compared to other starters

Maintenance-free switching

Ease of handling

Perfectly matched with SIRIUS devices for the

control cabinet

■

1) Not with 3RW30

3RW442. Datasheet(PDF) 5 Page - Siemens Semiconductor Group

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