Calculating The Switching Frequency (Example) - Siemens SIRIUS 3RW30 Manual

Configuration
11.6 Calculating the permissible switching frequency
1
5
3
1
a
4 6
2
Figure 11-3 Clearances from other devices
11.6.2

Calculating the switching frequency (example)

Problem
The maximum permissible switching frequency of a 5.5 kW (12.5 A) 3RW4024 soft starter
must be determined. The requirements are side-by-side assembly and vertical mounting. A
ramp-up time of approx. 3 s at an ambient temperature of 40 °C is specified as a
supplementary condition (e.g. a pump motor with CLASS 10 starting). The soft starter must
be connected to a 3RV2021 motor starter protector by means of cables. (Clearance between
3RV and 3RW >= 40 mm)
84
MLFB
3RW30 1./3RW30 2.
3RW30 3./3RW30 4
3RW40 2.
3RW40 3./3RW40 4.
3RW40 5./3RW40 7.
a
a (mm) a (in) b (mm)
15 0.59 60
30 1.18 60
15 0.59 60
30 1.18 60
5 0.2 100
Manual, 01/2010, 535 1995-02 DS01
b (in) c (mm) c (in)
2.36 40 1.56
2.36 40 1.56
2.36 40 1.56
2.36 40 1.56
4 75 3
SIRIUS 3RW30 / 3RW40