Derating For Altitude And Ambient Temperature; Acoustic Noise - Danfoss VLT AAF006 Operating Instructions Manual

Specifications
9.2 Derating for Altitude and Ambient
Temperature
The cooling capability of air is decreased at lower air
pressure.
Below 1000 m altitude no derating is necessary, but above
1000 m the ambient temperature (T
output current (I
Illustration 9.1.
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 2000 m is elaborated. At a temperature of 45
°C (T
- 3.3 K), 91% of the rated output current is
AMB, MAX
available. At a temperature of 41.7 °C, 100% of the rated
output current is available.
I (%)
OUT
100
95
9 9
90
85
80
0 500
Illustration 9.1 Altitude Derating

9.3 Acoustic Noise

DUT idle running (60 Hz) with no load with
fans on
DUT running (60 Hz) with 100% load
Table 9.2 Acoustic Noise
84
Operating Instructions
) or maximum
AMB
) should be derated in accordance with
out
1000 1500 2000 2500
Altitude (meters above sea level)*
AAF190
73
78.7
Danfoss A/S © 09/2014 All rights reserved.
110
100
90
80
70
60
50
40
30
20
10
0
0 5 10
Illustration 9.2 Input/Output vs. Maximum Ambient
Temperature
3000
15 20 25 30 35 40 45
Tamb (Max) Deg C
AAF250, AAF310, and AAF400
66.5
69
50 55
MG90V302