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9.2 De-rating
The drive can be operated at above rated ambient temperature, altitude and default carrier frequency by
de-rating drive capacity.
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Carrier Frequency De-rating
When carrier frequency of the drive is increased above default setting, you need to de-rate rated
drive output current according to the following table:
Power Carrier Frequency
Phd (kW) 3 kHz 4 kHz 5 kHz 6 kHz 7 kHz 8 kHz
18.5 100.0% 100.0% 100.0% 100.0% 95.7% 91.6%
22 100.0% 100.0% 100.0% 100.0% 95.5% 91.4%
30 100.0% 100.0% 100.0% 100.0% 93.5% 87.7%
37 100.0% 100.0% 100.0% 94.4% 89.0% 84.0%
45 100.0% 100.0% 100.0% 94.0% 88.6% 83.7%
55 100.0% 100.0% 94.1% 88.9% 84.0% 79.5%
75 100.0% 91.8% 84.2% 77.5% 70.9% 65.2%
90 100.0% 90.8% 82.3% 74.9% - -
110 100.0% 91.9% 84.4% 77.7% - -
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Ambient Temperature De-rating
Drive operation between -10°C to 40°C is normal without de-rating. Operation between 40°C and
50°C requires output current de-rating. Rated output current must be de-rated for 1.5% per 1°C
temperature rise. Permissible maximum temperature is 50°C.
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Altitude De-rating
The drive must be de-rated for an installation altitude of above 1000 meters because cooling
effect available from ambient air reduces. Rated output current must be de-rated for 1% per 100
meters. Maximum altitude is 3000 meters.
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