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

Fan
• Reduced stress on transmissions and V-belts