ABB ACS800 Hardware Manual page 86

86
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
P
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 an ambient temperature of 40 °C (104 °F). At lower
temperatures the ratings are higher (except I
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 metres (3281 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% - 1
or 0.90 · I
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. If the installation site is higher than 2000 m (6562 ft) above sea level, please
contact your local ABB distributor or office for further information.
Technical Data
(whichever value is greatest). If the limit is exceeded, motor torque and
.
%
· 10 °C = 90 % or 0.90. The output current is then 0.90 · I
°C
.
cont.max
).
max
, 1.1 · P or
hd N
, 0.90 · I
2N 2hd