Product description
3.3 Functional principle of the SIRIUS 3RW30 and 3RW40 soft starters
SIRIUS 3RW30 / 3RW40
22
Manual, 01/2010, 535 1995-02 DS01
3.3.3
Applications and use
Applications and selection criteria
The SIRIUS 3RW30 and 3RW40 soft starters represent a good alternative to direct or wye-
delta starters.
The most important advantages are:
• Soft start
• Soft stop (3RW40 only)
• Uninterrupted switching without current peaks that place a heavy load on the system
• Simple installation and commissioning
• Compact, space-saving design
Applications
The typical applications include:
• Conveyor belts
• Roller conveyors
• Compressors
• Fans
• Pumps
• Hydraulic pumps
• Agitators
• Circular saws / band saws
Note
If wye-delta starters are exchanged for soft starters in an existing system, you should check
the fuse ratings in the feeder in order to avoid false tripping. This is particularly important in
connection with heavy-duty starting or if the fuse that is installed has already been operated
close to the thermal tripping limit with the wye-delta assembly.
All elements of the main circuit (such as fuses, motor starter protectors, and switching
devices) must be dimensioned for direct starting and according to the on-site short-circuit
conditions, and ordered separately.
For recommended fuse and motor starter protector ratings for the feeder with soft starter,
refer to chapter Technical data [Page 121].
Summary of Contents for SIRIUS 3RW40
Page 1: ...Soft starters SIRIUS 3RW30 3RW40 Manual 01 2010 Industrial Controls Answers for industry ...
Page 2: ......
Page 68: ...Connecting 9 1 Electrical connection SIRIUS 3RW30 3RW40 68 Manual 01 2010 535 1995 02 DS01 ...
Page 210: ...Index SIRIUS 3RW30 3RW40 210 Manual 01 2010 535 1995 02 DS01 ...
Page 211: ......