ABB ACS880-14 - When Is Derating Necessary; Surrounding Air Temperature Derating

Nominal input current (rms) at 40 °C (104 °F)
I
1
Apparent power (no overload)S
n
Maximum output current. Available for 10 seconds at start, otherwise as long as allowed by drive
temperature. 140% … 200% of I
Hd
, depending on power rating.
I
max
Continuous rms output current. No overload capability at 40 °C (104 °F). This is indicated in the
type designation label as output current I
2
.
I
2
Typical motor power in no-overload use
P
n
Continuous rms output current allowing 10% overload for 1 minute every 5 minutes
I
Ld
Typical motor power for light-duty use
P
Ld
Continuous rms output current allowing 50% overload for 1 minute every 5 minutes
I
Hd
Typical motor power for heavy-duty use
P
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.
ABB recommends to select the drive, motor and gear combination for the required motion profile with the
DriveSize dimensioning tool available from ABB.
￭ When is derating necessary
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
•
the minimum requirements of motor cable length are not met (see chapter du/dt filters
and sine filters)
• DC voltage boost feature is used.
Note: The final derating factor is a multiplication of all applicable derating factors.
￭ Surrounding air 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.
1.00
0.85
+40 °C +55 °C
+104 °F +131 °F
k
T
Technical data 181