9.6.2 Derating for Altitude
The cooling capability of air is decreased at lower air
pressure. No derating is necessary at or below 1000 m
(3281 ft). Above 1000 m (3281 ft), the ambient
temperature (T
AMB
) or maximum output current (I
MAX
)
should be derated. Refer to Figure 9.2.
Max.I
out
(%)
at T
AMB, MAX
Altitude (km)
HO
NO
T
at 100% I
out
100%
96%
92%
0 K
-3 K
-6 K
1 km 2 km 3 km
-5 K
-8 K
-11 K
130BT866.10
AMB, MAX
Figure 9.2 Derating of Output Current Based on Altitude at
T
AMB
,
MAX
Figure 9.2 shows that at 41.7 °C (107 °F), 100% of the rated
output current is available. At 45 °C (113 °F) (T
AMB
, MAX-3
K), 91% of the rated output current is available.
Mechanical Installation Con... Design Guide
MG22B222 Danfoss A/S © 01/2018 All rights reserved. 153
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