ABB ACS880-M04, Hardware Manual

Page: 113 / 195

Technical data 113
Derating
The continuous output currents stated above must be derated if any of the following
conditions apply:
• ambient temperature exceeds 40 °C (+104°F)
• drive is installed higher than 1000 m above sea level
• parameter-adjustable motor noise level is set as low.
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.

Low motor noise derating
Low motor noise is activated with a drive parameter (see the firmware manual ). With
low motor noise, drive loadability is reduced and derating must be applied if a certain
constant output current is needed. See the derated values in the below tables.
For definitions of symbols used in the below tables, see Definitions on page 112 .
Ambient temperature
Derating factor
1.00
0.85
+40 °C +55 °C
+104 °F +131 °F