Functions
5.1 Start modes
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005
39
Ramp-up detection (3RW40 only)
The SIRIUS 3RW40 soft starter is equipped with an integrated ramp-up detection function. If
it detects a motor startup, the motor voltage is immediately increased to 100% of the mains
voltage. The internal bypass contacts close and the thyristors are bridged.
Figure 5-4 Current limiting with soft starter
Typical applications for current limiting
Current limiting is used for applications with large centrifugal masses (mass inertias) and
therefore longer starting times, e.g. fans, circular saws etc.
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