When Is Derating Needed; Ambient Temperature Derating - ABB ACS880-04 Hardware Manual

P Typical motor power in no-overload use.
N
I Continuous rms output current allowing 10% overload for 1 minute every 5 minutes
Ld
P Typical motor power for light-overload use.
Ld
I Continuous rms output current allowing 50% overload for 1 minute every 5 minutes
Hd
* Continuous rms output current allowing 40% overload for 1 minute every 5 minutes
** Continuous rms output current allowing 45% overload for 1 minute every 5 minutes
*** Continuous rms output current allowing 44% overload for 1 minute every 5 minutes
P Typical motor power for heavy-duty use.
Hd
Note: To achieve the rated motor power given in the table, the rated current of the drive must be higher than
or equal to the rated motor current. The power ratings apply to most IEC 34 motors at the nominal voltage of
the drive.
We recommend to select the drive, motor and gear combination for the required motion profile with the
DriveSize dimensioning tool available from ABB.

When is derating needed


Derate the continuous output current of the drive if
•
ambient temperature exceeds +40 °C (+104 °F) or
•
drive is installed higher than 1000 m (3280 ft) above sea level
•
switching frequency is other than default.
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. Calculate the output current by multiplying
the current given in the rating table by the derating factor.
Derating factor
1.00
0.85
+40 °C +55 °C
+104 °F +131 °F
Technical data 177
Ambient temperature