Hydraulic Pump Application - Siemens SIRIUS 3RW30 Manual

Application planning
7.1 Application examples
7.1.2

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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SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005