Technical data
94
Derating
The load capacity (current and power) decreases if the installation site altitude exceeds 1000 metres
(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 by
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% - 1 · 10 °C =
90% or 0.90. The output current is then 0.90 · I
2N
or 0.90 · I
2hd
.
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. See Installation sites above 2000
metres (6562 feet) on page 57.
Cooling characteristics
Cooling requirements for flange mounting
ACS800-04
frame size
Minimum effective area of air inlet Minimum effective area of air outlet
cm
2
cm
2
IP22 cabinet IP54 cabinet IP22 cabinet IP54 cabinet
R2 125 250 200 400
R3 250 500 400 800
R4 375 750 600 1200
R5 500 1000 800 1600
R6 1000 2000 1600 3200
ACS800-04
frame size
Air flow: drive front side Air flow: heat sink side
m
3
/h m
3
/h
R2 18 35
R3 30 69
R4 30 103
R5 30 168
R6 30 405
%
°C
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