3-35
3.19 Inverter derating based on Carrier Frequency
The curves are showing the applicable output current de-rate due to setting of carrier frequency and the
ambient operating temperatures of 40 and 50 degrees.
When the carrier frequency is below 10 KHz ambient temperature will not affect rated current.
When the carrier frequency is higher than 10 KHz
If the ambient temperature is below 40°C (104°F), 100% output rated current at 16 KHz.
If the ambient temperature is below 50°C (122°F), 85% output rated current at 16 KHz.
It is required to derate 1.5% of output rated current each additional degree when the ambient temperature
rises above 50 degrees °C (122°F)..
100%
70%
85%
90%
50%
60%
2
4
6
8
10
12
14
16
Current Rating
Carrier Frequency(kHz)
Note:
De-rate curve for ambient temperature of 122°F (50°C).
De-rate curve for ambient temperature of 104°F (40°C).
