From the table, you see that the PWM carrier frequency has significant influences on the
electromagnetic noise, the AC motor drive heat dissipation, and the motor acoustic noise.
Therefore, if the surrounding noise is greater than the motor noise, lower the carrier frequency to
reduce the temperature rise. Although the motor has quiet operation in the higher carrier
frequency, consider the entire wiring and interference.
With default carrier frequency:
(1) Take VFD007EL21W(-1) (need to install cooling fans) as an example, assume that the
ambient temperature is 40°C, the drive output current must be controlled within 100% of the
rated current. If the ambient temperature is 50°C, the drive output current should be within
80% of the rated current.
(2) When model VFD007EL21W(-1) works without cooling fans, assume that the ambient
temperature is 40°C, the drive output current must be controlled within 100% of the rated
current. If the ambient temperature is 50°C, the drive output current should not exceed 80%
of the rated current.
(3) Take VFD007EL21W(-1) (need to install cooling fans) as an example, assume that the
ambient temperature is 40°C and the default carrier frequency is 8 kHz, the drive output
current reaches 100% of the rated current. If the carrier frequency is 12 kHz, the drive
output current should be controlled within 80% of the rated current.
(4) When model VFD007EL21W(-1) works without cooling fans, assume that the ambient
temperature is 40°C and the default carrier frequency is 8 kHz, the drive output current
reaches 100% of the rated current. If the carrier frequency is 12 kHz, the drive output
current should be controlled within 80% of the rated current.
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