ABB ACS880-11 - Altitude Derating

DeratingTemperature
range
Derate 1.5% for every 1 °C (1.8 °F): Calculate the output by multiplying the
current given in the rating table by the derating factor (k, in the diagram below).
+40 … +55 °C
+104 … +131 °F
T
1.00
0.90
+40 °C
+104 °F
+50 °C
+122 °F
k
+55 °C
+131 °F
0.80
0.75
0.85
0.95
-15 °C
+5 °F
…
0.775
Note: For surrounding air temperatures above +40 °C (+104 °F), the power cables must
be rated for +90 °C (+194 °F) minimum.
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.
166 Technical data