ABB ACS550-02 User Manual page 183

Symbols
Typical ratings:
Normal use (10% overload capability)
I continuous rms current. 10% overload is allowed for one minute.
2N
P typical motor power. The power ratings apply to most IEC 34, or NEMA 4-pole motors at the
N
nominal voltage, 400 V or 460 V.
Heavy-duty use (50% overload capability)
I continuous rms current. 50% overload is allowed for one minute.
2hd
P typical motor power. The power ratings apply to most IEC 34, or NEMA 4-pole motors at the
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nominal voltage, 400 V or 460 V.
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
exceeded, motor 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).
Derating
The load capacity (current and power) decreases if the installation site altitude
exceeds 1000 meters (3300 ft), or if the ambient temperature exceeds 40 °C
(104 °F) or if 8 kHz switching frequency (parameter 2606) is used.
Temperature Derating
In the temperature range +40 °C
is decreased 1% for every 1 °C (1.8 °F) above +40 °C (+104 °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%/°C x 10 °C
The output current is then 0.90 x I
Altitude Derating
In altitudes from 1000
for every 100 m (330 ft). 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.
50 °C (+104 °F
...
90% or 0.90.
=
or 0.90 x I
2N
4000 m (3300 13,200 ft) above sea level, the derating is 1%
... ...
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122 °F) the rated output current
...
.
2hd
181
. If the limit is
Technical Data