Introduction
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04
1-7
1.2 Application and Use
Applications and
selection criteria
3RW44 soft starters are an alternative for star-delta starters and frequency
converters.
Their major benefits are smooth starting and stopping, uninterrupted changeover
without current peaks that would stress the power supply, and their compact
dimensions.
Numerous drives which previously could only be operated with frequency
converters can be changed over to soft starter operation using the 3RW44 soft
starter, as long as no speed control, no particularly high starting torque or no
startup with close to nominal current is required.
Applications Possible applications include:
• Conveyor belts
• Powered roller conveyors
• Compressors
• Ventilators, fans
•Pumps
• Hydraulic pumps
• Stirrers
• Centrifugal machines
• Milling machines
• Mills
• Crushers
• Disk saws/ribbon saws
•...
Advantages Conveyor belts and systems:
• Jerk-free starting
• Jerk-free braking
Centrifugal pumps, reciprocating pumps:
• Water hammering is avoided
• Increased service life of the tubing
Stirrers, mixers:
• Reduced starting current
Fans:
• Reduced stress on transmissions and V-belts
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