Sizing; Derating; Temperature Derating; Altitude Derating - ABB ACS800-04 Hardware Manual

102 Technical data

Sizing


The current ratings are the same regardless of the supply voltage within one voltage
range. To achieve the rated motor power given in the table, the rated current of the
drive must be higher than or equal to the rated motor current.
Note 1: The maximum allowed motor shaft power is limited to 1.5 ·
P
(whichever value is greatest)
cont.max
current are automatically restricted. The function protects the input bridge of the
drive against overload. If the condition exists for 5 minutes, the limit is set to
P
.
cont.max
Note 2: The ratings apply at ambient temperature of 40 °C (104 °F). In lower
temperatures the ratings are higher (except
Note 3: Use the DriveSize PC tool for a more accurate dimensioning if the ambient
temperature is below 40 °C (104 °F) or the drive is loaded cyclically.

Derating


The load capacity (current and power) decreases if the installation site altitude
exceeds 1000 m (3281 ft), or if the ambient temperature exceeds 40 °C (104 °F).
Note: If the ingoing cooling air temperature of the drive module is max. 40 °C
(104 °F), no derating of the drive output current is needed despite the cabinet
temperature rising over 40 °C (104 °F).

Temperature derating

In the temperature range of +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.
°C
The output current is then 0.90 ·

Altitude derating

At altitudes from 1000 to 4000 m (3281 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.
Installation sites above 2000 metres (6562 feet)
See
.
If the limit is exceeded, motor torque and
I
).
max
I I
, 0.90 · or 0.90 ·
2N 2hd
P ,
hd
I
.
cont.max
(page 61).
P
1.1 · or
N