Derating; Temperature Derating; Altitude Derating; Single Phase Supply Derating - ABB ACS550-01 User Manual

ACS550 User's Manual

Derating

The load capacity (current and power) decreases for certain situations, as defined
below. In such situations, where full motor power is required, oversize the drive so
that the derated value provides sufficient capacity.
For example, if your application requires 15.4 A of motor current and a 8 kHz
switching frequency, calculate the appropriate drive size requirement as follows:
The minimum size required = 15.4 A / 0.80 = 19.25 A
Where: 0.80 is the derating for 8 kHz switching frequency (see "Switching Frequency Derating"
below).
Referring to I
requirement of 19.25 A: ACS550-x1-023A-4, or ACS550-x1-024A-2

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.

Single Phase Supply Derating

For 208...240 Volt series drives, a single phase supply can be used. In that case, the
derating is 50%.
Switching Frequency Derating
If the 8 kHz switching frequency (parameter 2606) is used, either:
• Derate P
• Set parameter 2607
switching frequency if/when the drive's internal temperature exceeds 90 °C. See
the parameter description for 2607 for details.
If the 12 kHz switching frequency (parameter 2606) is used, either:
• Derate P
30 °C (86 °F), and note that the current is limited to a maximum value of I
• Set parameter 2607
switching frequency if/when the drive's internal temperature exceeds 80 °C. See
the parameter description for 2607 for details.
in the ratings tables (page 215), the following drives exceed the I
2N
...
90% or 0.90.
=
4000 m (3300
...
/P and I /I to 80% or
N hd 2N 2hd
SW FREQ CTRL
/P and I /I to 65%, and derate ambient temperature maximum to
N hd 2N 2hd
SW FREQ CTRL
50 °C (+104 °F 122 °F) the rated output current
...
or 0.90 x I .
2N 2hd
13,200 ft) above sea level, the derating is 1%
...
= 1 ( ) which allows the drive to reduce the
ON
= 1 ( ) which allows the drive to reduce the
ON
217
2N
, or
2hd
Technical Data