3RW443. datasheet(19/40 Pages) SIEMENS

19 / 40 page

The SIRIUS 3RW40 offers this

sensitivity as a standard:

The settable current limiting of the

SIRIUS 3RW40 limits the load of the

mains transformer during motor

start-up.

Motor protection is ensured by the

motor overload relay with settable

tripclasses integrated in the soft

starter.

The adjustable voltage ramp ensures

the hydraulic pump’s start and

stop without torque surges.

■

For the production of motor blocks, the

required bores are drilled in the motor’s

aluminum block by means of a milling

head. Due to the milling head’s high

inertia, shutdown of the 15 kW motor

is subject to long stopping times, which

cause long downtimes for tool changes

and set-up operation.

The start-up behavior of milling

machines requires maximum

functionality:

To prevent excessive wear of the drive

belts due to slippage, milling machines

require an optimized and torque-

controlled start-up behavior.

The motor’s starting current has to be

reduced to minimize the mains load.

The motor has to be braked with DC

current to reduce the machine’s long

stopping times.

■

Competent solution with SIRIUS

3RW44:

To optimally master the difficult

starting conditions, the SIRIUS 3RW44

with torque control and dynamic DC

brake function is employed.

Slippage of the belts during start-

up is prevented by torque control with

adjusted torque limiting function.

This rapidly accelerates the milling

head to the nominal speed without

slippage of the belt drives.

A higher-level current limiting function

reduces the motor’s starting current to

a set maximum value.

The optimum setting of the dynamic

DC brake function shuts the milling

head down in minimum time.

Also motor and device overload

protection is excellently mastered

by the SIRIUS 3RW44 high-feature soft

starter.

■

SIRIUS 3RW44 – for soft starting of

milling machines with DC braking

3RW443. Datasheet(PDF) 19 Page - Siemens Semiconductor Group

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