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Technical data 121
Derating
The load capacity (current and power) decreases if the installation site altitude
exceeds 1000 m (3300 ft), or if the ambient temperature exceeds 40 °C (104 °F).
Temperature derating
In the temperature range +40 °C (+104 °F) to +50 °C (+122 °F) the rated output
current is decreased 1% for every additional 1 °C (1.8 °F). The output current is
calculated by multiplying the current given in the rating table by the derating factor.
Example If the ambient temperature is 50 °C (+122 °F), the derating factor is 100% -
%
I
I
1
· 10 °C = 90% or 0.90. The output current is then 0.90 ·
or 0.90 ·
.
2N
2hd
°C
Altitude derating
In altitudes from 1000 to 4000 m (3300 to 13123 ft) above sea level, the derating is
1% for every 100 m (328 ft). For a more accurate derating, use the DriveSize PC tool.
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