ABB ACH550-01 User Manual page 389

ACH550 User's Manual
Derating
The load capacity (current and power) decreases if the
installation site altitude exceeds 1000 m (3300 ft), or if the
ambient temperature exceeds 40°C (104°F), or if 8 or 12 kHz
switching frequency (parameter 2606) is used.
Temperature derating
In the temperature range +40°C...50°C (+104°F...122°F), the
rated output current is decreased by 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 = 90% or 0.90.
The output current is then 0.90*I
Altitude derating
In altitudes from 1000...4000 m (3300...13,200 ft) above sea
level, the derating is 1% 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,
derate P and I
N
If the 12 kHz switching frequency (parameter 2606) is used,
derate P and I
N
Technical data
2N
to 80%.
2N
to 65%.
2N
.
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