Altitude Derating; Switching Frequency Derating - ABB ACS880-07 Hardware Manual

Altitude derating


At altitudes from 1000 to 4000 m (3300 to 13123 ft) above sea level, the output current
derating is 1% for every 100 m (328 ft). If ambient temperature is below +40 °C (+104 °F),
the derating can be reduced by 1.5% for every 1 °C (1.8 °F) reduction in temperature. For
a more accurate derating, use the DriveSize PC tool. A few altitude derating curves are
shown below.
Installation site altitude
4000 m
13123 ft
3500 m
11429 ft
3000 m
9842 ft
2500 m
8202 ft
2000 m
6562 ft
1500 m
4921 ft
1000 m
3300 ft
+20 °C
+68 °F

Switching frequency derating


Switching frequencies other than default can require output current derating. Contact ABB
for more information.
+25 °C
+77 °F
Derating factor 1.00
Derating factor 0.95
Derating factor 0.9
Derating factor 0.85
Derating factor 0.80
0.80
0.85
0.90
0.95
1.00
+30 °C +35 °C
+86 °F +95 °F
Technical data 199
+40 °C
+104 °F
Ambient temperature