Altitude Derating - ABB ACH580-01 Hardware Manual

k
1.00
0.95
0.90
0.85
0.80
0.75
...
-15 °C
+5 °F

Altitude derating

In altitudes 1000...4000 m (3300...13120 ft) above sea level, the derating is 1% for
every 100 m (330 ft).
Note: There are special considerations in corner-grounded installations above 2000 m.
Contact your local ABB representative for further information.
The output current is calculated by multiplying the current given in the rating table by
the derating factor k, which for x meters (1000 m <= x <= 4000 m) is:
Altitude and surrounding air temperature
At altitudes from 1000...4000 m (3281...13123 ft) above sea level and temperature
+40 °C (+104 °F), the derating is 1 percentage point for every additional 100 m (328 ft).
If surrounding air temperature is below +40 °C, the derating can be reduced by 1.5
percentage point for every 1 °C reduction in temperature.
A few combined altitude and temperature derating curves for 1000...4000 m are shown
below. For example, if the temperature is 30 °C, the derating factor is 1 - 1.5% · 10 =
0.85.
For a more accurate derating, use the DriveSize PC tool.
+40 °C +45 °C +50 °C
+104 °F +113 °F +122 °F
0.90
T
Technical data 245