Derating - ABB ACS880-37 Hardware Manual

Derating


Ambient temperature derating
In the temperature range +40...50 °C (+104...122 °F), the rated output current is derated
by 1% for every added 1 °C (1.8 °F). The output current can be calculated by multiplying
the current given in the rating table by the derating factor (k):
k
1.00
0.90
0.80
+40 °C
+104 °F
Altitude derating
At altitudes from 1000 to 4000 m (3281 to 13123 ft) above sea level, the output currents
must be derated by 1% for every 100 m (328 ft). For a more accurate derating, use the
DriveSize PC tool.
Switching frequency derating
Switching frequencies other than default can require output current derating. Contact ABB
for more information.
Output frequency derating
Motor operation above 150 Hz can require type-specific output current derating. Contact
ABB for more information.
+50 °C T
+122 °F
Technical data 173