System overview
2.6 Derating as a function of the installation altitude and ambient temperature
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
47
Derating as a function of the installation altitude and ambient
temperature
The Booksize power units are designed for operation at an ambient temperature of 0° C to
40° C, installation altitudes up to 1000 m above sea level and the relevant specified pulse
frequency.
The air pressure and therefore the air density reduce at higher altitudes above sea level. The
same quantity of air does not have the same cooling effect and the air clearance between
two electrical conductors can only insulate a lower voltage. Typical values for air pressure
are summarized in the table below:
Table 2- 5 Air pressure for various installation altitudes
Installation altitude above sea level
0 1000 2000 3000 4000
Air pressure in mbar [kPa]
● The output current must be reduced if the modules are operated at ambient temperatures
above 40° C (see derating characteristics for the individual modules). The operation of
the power units is not permitted above 55° C.
● The output current must be reduced if the modules are operated at installation altitudes
above 1000 m (see derating characteristics for the individual modules). The operation of
the power units is not permitted at altitudes above 4000 m.
● For an installation altitude above 2000 m, a TN or TT supply system with grounded
neutral point is required (no grounded phase conductor). If the neutral point is not
grounded, an isolating transformer must be connected upstream for which the secondary
windings are grounded at the neutral point.
A reduction of the line supply voltage phase-phase is not necessary.
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