Application planning
7.1 Application examples
SIRIUS 3RW30 / 3RW40
66 Manual, 10/2018, NEB535199502000/RS-AB/005
Hydraulic pump application
Using the 3RW40 with hydraulic pumps
The SIRIUS 3RW40 is optimally suited for soft starting and stopping of hydraulic pumps.
With a rating of 200 kW / 250 hp, this soft starter is used, for example, in the production of
sheet parts to drive the presses.
The drives for hydraulic pumps must meet the following requirements:
● The motor's starting current has to be reduced to minimize the load on the higher-level
mains transformer during startup.
● Integrated motor protection is called for to reduce wiring expenditure and space
requirements in the control box.
● The hydraulic pump must be started and stopped in a soft manner to minimize the
mechanical load on the drive and the pump caused by torque surges during starting and
stopping.
The SIRIUS 3RW40 soft starter offers the following advantages:
● The settable current limiting of the SIRIUS 3RW40 limits the load on the mains
transformer during the motor startup.
● Motor protection is ensured by the motor overload relay with settable tripping times
integrated in the soft starter.
● The adjustable voltage ramp ensures that the hydraulic pump is started and stopped
without torque surges.
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