ABB ACS850 series, Hardware Manual

Page: 79 / 120

Technical data
79
Derating
The continuous output currents stated above must be derated if any of the following conditions apply:
• the ambient temperature e40 °C (+104°F)
• the drive is installed higher than 1000 m above sea level.
Note: The final derating factor is a multiplication of all applicable derating factors.
Ambient temperature derating
In the temperature range +40…55 °C (+104…131 °F), the rated output current is derated by 1% for
every added 1 °C (1.8 °F) as follows:
Altitude derating
At 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.
Note: If the installation site is higher than 2000 m (6600 ft) above sea level, connection of the drive to
an ungrounded (IT) or corner-grounded delta network is not allowed.
Ambient temperature
Derating factor
1.00
0.85
+40 °C +55 °C
+104 °F +131 °F