Symbols; Sizing; Derating; Temperature Derating - ABB ACS800-U4 Hardware Manual

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Symbols

Nominal ratings
I
cont.max
I
max
Typical ratings:
No-overload use
P
cont.max
Light-overload use (10 % overload capability)
I
2N
P
N
Heavy-duty use (50 % overload capability)
I
2hd
P
hd

Sizing

The current ratings are the same regardless of the supply voltage within one voltage range. 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.
Note 1: The maximum allowed motor shaft power is limited to 1.5 · P
torque and current are automatically restricted. The function protects the input bridge of the drive
against overload.
Note 2: The ratings apply in ambient temperature of 40 °C (104 °F). In lower temperatures the ratings
are higher (except I
Note 3: Use the DriveSize PC tool for a more accurate dimensioning if the ambient temperature is
below 40 °C (104 °F) or the drive is loaded cyclically.

Derating

The load capacity (current and power) decreases if the installation site altitude exceeds 1000 metres
(3281 ft), or if the ambient temperature exceeds 40 °C (104 °F).

Temperature derating

In the temperature range +40 °C (+104 °F) to +50 °C (+122 °F), the rated output current is decreased
1 % for every additional 1 °C (1.8 °F). The output current is calculated by multiplying the current given
in the rating table by the derating factor.
Example If the ambient temperature is 50 °C (+122 °F), the derating factor is 100 % - 1
90 % or 0.90. The output current is then 0.90 · I

Altitude derating

At altitudes from 1000 to 4000 m (3281 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. If the installation site is higher than
2000 m (6600 ft) above sea level, please contact your local ABB distributor or office for further
information.
Technical data
continuous rms output current. No overload capability at 40 °C.
maximum output current. Available for 10 s at start, otherwise as long as allowed by drive
temperature.
typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
400 V or 500 V.
continuous rms current. 10 % overload is allowed for one minute every 5 minutes.
typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
400 V or 500 V.
continuous rms current. 50 % overload is allowed for one minute every 5 minutes.
typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
400 V or 500 V.
).
max
. If the limit is exceeded, motor
hd
, 0.90 · I or 0.90 · I
2N 2hd cont.max
%
· 10 °C =
°C
.