ABB ACS880-07 - Altitude Derating; Definitions; Derating; Surrounding Air Temperature Derating

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Definitions
Supply voltage range U
N
Nominal rms input current I
1
Nominal output current (available continuously with no over-loading) I
2
Maximum output current. Available for 10 seconds at start, then as long as allowed by drive
temperature.
I
max
Typical motor power in no-overload use. The horsepower ratings are typical NEMA motor
sizes at 460 V (ACS880-07-xxxxA-5) and 575 V (ACS880-07-xxxxA-7) respectively.
P
N
Apparent power in no-overload use S
N
Continuous rms output current allowing 10% overload for 1 minute every 5 minutes I
Ld
Typical motor power in light-overload use P
Ld
Continuous rms output current allowing 50% overload for 1 minute every 5 minutes I
Hd
Typical motor power in heavy-duty use P
Hd
Note 1: The ratings apply at an ambient temperature of 40 °C (104 °F).
Note 2: 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 DriveSize dimensioning tool available from ABB is recommended for selecting the drive, motor and
gear combination.
￭
Derating
Surrounding air temperature derating
In the temperature range +40…50 °C (+104…122 °F), the rated output current is derated
by 1 percentage point for every added 1 °C (1.8 °F). The output current can be calculated
by multiplying the current given in the rating table by the derating factor (k) :
T
1.00
0.90
+40 °C
+104 °F
+50 °C
+122 °F
k
0
.80
Altitude derating
At altitudes more than 1000 m (3281 ft) above sea level, the output current derating
is 1 percentage point for every added 100 m (328 ft). For example, the derating factor
for 1500 m (4921 ft) is 0.95. The maximum permitted installation altitude is given in
the technical data.
If the surrounding air temperature is less than +40 °C (104 °F), the derating can be
reduced by 1.5 percentage points for every 1 °C (1.8 °F) reduction in temperature. A
few altitude derating curves are shown below.
Technical data 225