Danfoss VLT AAF00x, Руководство по эксплуатации, Страница: 93 / 103

8.1.2 Derating for Low Air Pressure
The cooling capability of air is decreased at lower air
pressure.
Below 1000m altitude no derating is necessary but above
1000m the ambient temperature (T
AMB
) or max. output
current (I
out
) should be derated in accordance with the
shown diagram.
An alternative is to lower the ambient temperature at high
altitudes and thereby ensure 100% output current at high
altitudes. As an example of how to read the graph, the
situation at 2km is elaborated. At a temperature of 45
°
C
(T
AMB, MAX
- 3.3 K), 91% of the rated output current is
available. At a temperature of 41.7
°
C, 100% of the rated
output current is available.
80
0 500
100
95
90
85
1000 1500 2000 2500 3000
Altitude (meters above sea level)*
130BB008.10
I
OUT
(%)
0 500 1000 1500 2000 2500 3000
Altitude (meters above sea level)*
30
35
40
45
(°C)
A
mb
. T
emp
.
130BB009.10
HO
NO
Derating of output current versus altitude at T
AMB, MAX
for frame sizes D, E and F.
General Specifications VLT Active Filter AAF 00x
92 MG.90.V2.02 - VLT® is a registered Danfoss trademark
8 8