Derating; Temperature Derating; Altitude Derating; Cooling Characteristics - ABB ACS800-U4 Hardware Manual

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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
90% or 0.90. The output current is then 0.90 · I

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
metres (6562 feet)

Cooling characteristics

ACS800-04
frame size
R2
R3
R4
R5
R6

Cooling requirements for flange mounting

ACS800-04
frame size
Technical data
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
on page 57.
Minimum effective area of air inlet
IP22 cabinet
125
250
375
500
1000
Air flow: drive front side
R2
R3
R4
R5
R6
or 0.90 · I
2N 2hd
Minimum effective area of air outlet
2
cm
IP54 cabinet
250
500
750
1000
2000
3
m /h
18
30
30
30
30
%
°C
.
Installation sites above 2000
2
cm
IP22 cabinet IP54 cabinet
200
400
600
800
1600
Air flow: heat sink side
3
m /h
35
69
103
168
405
· 10 °C =
400
800
1200
1600
3200