3RW303. datasheet(6/40 Pages) SIEMENS

6 / 40 page

How are the parameters of a soft

starter set?

With our standard soft starters, the

ramp-up time, starting voltage and

ramp-down time can be comfortably set

via potentiometers. The values can be

adjusted particularly finely within the

usual setting ranges. For soft starters

with motor overload protection, this also

applies to the nominal motor current, the

selection of the tripping class and the

settable current limiting.

The multiple functions of our high-

feature soft starters are set rapidly and

comfortably via the integrated keypad

with menu-prompted graphical display.

Also commissioning and diagnostics are

realized via this keypad.

Why is torque control the better

solution?

Current and voltage fluctuations upon

start-up are problems frequently

encountered by operators of power supply

systems. Your machines are then stressed

by abrupt torque fluctuations. The soft

torque control of our high-feature soft

starters minimizes the maintenance

expenditures for your machines.

How about motor overload protection?

No problem: Our soft starters come with

integrated motor overload protection

for many applications. This does away

with additional wiring costs and even

protects the soft starter against overload.

For all other cases, you can utilize the

advantages of our further SIRIUS devices

for the control cabinet by employing our

circuit breakers or overload relays. All

components are perfectly matched.

Different starter types in comparison: Direct start, wye-delta* start and soft start

Torque control prevents abrupt fluctuations

Technology in Detail

The Soft Principle

DOL: Direct start

: Wye-delta* start

3RW: Soft start

UM:

Motor voltage

IM:

Motor current

MM: Motor torque

Time

tR:

Ramp time

Speed

Rated values

DOL

3RW

MDOL

M3RW

IDOL

I3RW

MDOL

1 M3RW

with voltage ramp

2 M3RW

with torque control

3 ML

Load (e.g. pump)

* star-delta

3RW303. Datasheet(PDF) 6 Page - Siemens Semiconductor Group

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