Areas Of Application And Load Types - Siemens SIRIUS 3RW55 Equipment Manual

3.8

Areas of application and load types

Starting of a motor causes a rapid change in the load current. The resulting torque impulses
place severe stresses on the mechanical parts of a machine or plant. Moreover, voltage dips can
occur in the power supply system which can have a negative influence on other devices:
• Flicker in lights
• Influence on computer systems
• Contactors and relays dropping out
The 3RW55 and 3RW55 Failsafe soft starters control the voltage continuously. The torque and
the current are thus also increased continuously. The power supply system is safeguarded
against peak loads and the drive train is protected against damage:
• Smooth starting/stopping, e.g. for conveyor belts
• No pressure surges, e.g. for pumps
• Increased service life of the pipe system, e.g. for compressors
• Reduced starting current, e.g. for agitators
• Reduced stress on gearbox and V belt, e.g. for saws
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Conveyor belts
Small/large fans
Agitators
Mills
3.8 Areas of application and load types
Roller conveyors
Pumps
Centrifuges
Crushers
Description
Compressors
Hydraulic pumps
Milling machines
Circular saws/band saws
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