User Manual

Configuration
11.5 Installation altitude and ambient temperature
SIRIUS 3RW30 / 3RW40
86 Manual, 10/2010, 535199502000 DS 03
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
taken into account when the device is dimensioned (refer to chapter Technical data
(Page 127)).
CAUTION
Risk of property damage.
The soft starter may be damaged if the maximum installation altitude (5000 m above sea
level) or an ambient temperature of 60 °C is ignored.
Mounting position, assembly type
The mounting position and assembly type (refer to chapter Installing the soft starter
(Page 57)) can influence the soft starter's permissible switching freq
uency. Refer to chapter
Calculating the permissible switching frequency (Page 87) for the permi
ssible mounting and
assembly combinations as well as the resulting factors for the soft starter switching
frequencies.