3RW445. datasheet(18/40 Pages) SIEMENS

18 / 40 page

SIRIUS Soft Starters in Practical Use

Application Examples

Roller conveyors are, for example,

employed in parcel distribution systems

for transporting parcels to and from

individual work stations. For this purpose,

the direction of rotation of the used 11 kW

motor has to be adjustable in order to

realize both conveyance directions.

Roller conveyors pose high

requirements:

The roller conveyor has to start

smoothly to prevent damage to the

transported goods due to slipping

or tilting.

The machine’s wear and maintenance

intervals should be minimized, which

is why slippage of the belt drive during

start-up must be prevented.

The current load upon motor start-up

is to be reduced by means of a voltage

ramp.

The feeder assembly should be as

small as possible so as to not exceed

the control cabinet’s space capacity.

■

Optimum performance with

SIRIUS 3RW30:

The roller conveyor is rapidly

accelerated to the nominal speed

without torque surges thanks to

optimum setting of the voltage ramp

during start-up.

The motor’s starting current is reduced.

Reversing operation of the conveyor

belt is realized through contactor

interconnection with SIRIUS 3RA13

reversing contactor combinations.

Feeder and motor protection are

realized with SIRIUS 3RV circuit

breakers.

The use of SIRIUS system components

guarantees maximum wiring

reductions and space savings.

■

In addition to many further application

areas, the SIRIUS 3RW40 is optimally

suited for the soft start and stop of

hydraulic pumps. With a rating of 200 kW,

these soft starters are for example used

in the production of sheet parts, to drive

the respective presses.

Hydraulic pumps require sensitive

drives:

The motor’s starting current has to

be reduced to minimize the load of the

superior mains transformer during

start-up.

Normally, integrated motor protection

is called for to reduce wiring

expenditures and space requirements

in the control box.

The hydraulic pump is to be started

and stopped in a soft manner, to

minimize the mechanical load on the

drive and the pump caused by the

torque surge during starting and

stopping.

■

SIRIUS 3RW30 – for soft reversing

operation of roller conveyors

SIRIUS 3RW40 – for soft starting

of hydraulic pumps

3RW445. Datasheet(PDF) 18 Page - Siemens Semiconductor Group

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