Altitude Derating - ABB ACS880-01 Hardware Manual

186 Technical data
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Altitude derating

Altitude derating
At altitudes from 1000 to 4000 m (3300 to 13123 ft) above sea level, the derating is 1%
for every 100 m (328 ft). If ambient temperature is below +40 °C (+104 °F), the derating
can be reduced by 1.5% for every 1 °C reduction in temperature. For a more accurate
derating, use the DriveSize PC tool. A few altitude derating curves are shown below.
4000 m
13123 ft
3500 m
11429 ft
3000 m
9842 ft
2500 m
8202 ft
2000 m
6562 ft
1500 m
4921 ft
1000 m
3300 ft
+20 °C
+68 °F
The altitude derating can be reduced if the temperature is below +40 °C, for example,
if the temperature is 30 °C, the derating factor is 1 - 1.5% · 10 = 0.85. You can reduce
the output current by 35% instead of 40% at 4000 meter above the sea level.
+25 °C
+77 °F
Derating factor 1.00
Derating factor 0.95
Derating factor 0.90
Derating factor 0.85
Derating factor 0.80
0.85
0.90
0.95
1.00
+30 °C
+86 °F
0.80
+35 °C +40 °C
+95 °F +104 °F