Introduction
2.2 Application and use
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
17
The diagram below shows the method of operation of the 3RW44 soft starter:
Figure 2-5
Phase angle control and schematic diagram of a soft starter with internal bypass contacts
2.2
Application and use
Applications and selection criteria
3RW44 soft starters can be used as an alternative to star-delta (wye-delta) starters and
frequency converters.
Their main benefits are their ability to perform soft starting, soft stops, and uninterrupted
changeover without current peaks that put a strain on the system, as well as their compact
dimensions.
Many drives that could previously only be operated with frequency converters can be
changed over to soft starter operation using the 3RW44 soft starter, provided no speed
control, no particularly high starting torque, or startup with close to rated current, is required.
