320 Technical data
Derating
The continuous output currents stated above must be derated if any of the following
conditions apply:
• the ambient temperature exceeds +40 °C (+104°F)
• the AC supply voltage is higher than 400 V
• 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:
Supply voltage derating
With supply voltages above 400 V AC or 540 V DC, the continuous output current is
derated linearly 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
0.70
+40 °C
+55 °C
+104 °F
+131 °F
Supply voltage
Derating factor
1.00
0.86
400 V AC 480 V AC
540 V DC
648 V DC
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