Reducing The Rated Data; Installation Altitude And Ambient Temperature - Siemens SIRIUS 3RW30 Manual

Configuration

11.4 Reducing the rated data

11.4 Reducing the rated data
You can reduce the rated data of the SIRIUS 3RW30 and 3RW40 soft starters if
• The installation altitude is higher than 1000 m.
• The ambient temperature in the switching device's environment exceeds 40 °C.
• The lateral clearances described earlier are not complied with, e.g. side-by-side assembly
or direct mounting of other switching devices (assembly type).
• The vertical mounting position is not complied with.
11.5

Installation altitude and ambient temperature

Installation altitude
The permissible installation altitude must not be higher than 5000 m above sea level (higher
than 5000 m on request).
If the installation altitude exceeds 1000 m, the rated operational current must be reduced for
thermal reasons.
If the installation altitude exceeds 2000 m, the rated voltage must also be reduced owing to
the restricted dielectric strength. A maximum permissible rated voltage of 460 V applies at
installation altitudes between 2000 m and 5000 m above sea level.
The following diagram shows the reduction in the rated device current as a function of the
installation altitude:
The rated operational current I
level.
Figure 11-2
Ambient temperature
The maximum permissible ambient temperature of the soft starter must not exceed 60 °C.
SIRIUS 3RW30 and 3RW40 soft starters are designed for operation with nominal current at
an ambient temperature of 40 °C. If this temperature is exceeded, e.g. owing to an
impermissible temperature rise in the control cabinet, other loads, or a general increase in the
ambient temperature, the resulting deterioration in the soft starter's performance must be
80
must be reduced at altitudes higher than 1000 m above sea
e
Reduction as a function of the installation altitude
SIRIUS 3RW30 / 3RW40
Manual, 01/2010, 535 1995-02 DS01