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Below is the derating curve of the big-power VFDs:
Derating coefficient (%)
Temperature (℃)
-10 0 10 20 30 40 50
100
90
80
60
40
20
Note: It is not recommended to use the VFD at an environment with the temperature higher than
50°C. If you do, you shall be held accountable for the consequences caused.
B.2.2.2 Altitude derating
When the altitude of the site where the VFD is installed is lower than 1000 m, the VFD can run at the
rated power. When the altitude exceeds 1000m, derate 1% for every additional 100m. When the
installation site altitude exceeds 3000m, consult the local dealer or office.
B.2.2.3 Carrier frequency derating
For TD350 series VFDs, different power level corresponds to different carrier frequency range. The
rated power of the VFD is based on the factory carrier frequency, so if it is above the factory value, the
VFD needs to derate.
Carrier frequency and derating coefficient
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