The RMS value of line current is affected not only by Altivar size but also by harmonics caused by Altivar itself.
In drives up to 22kW (up to D22N4/E), the charging current during Altivar power-up is limited by a pre-charging resistor that is bypassed after charging the DC bus.
In drives above 22kW, there is no pre-charging resistor but there is a semi-controlled input rectifier (thyristor + diode bridge) and moreover built-in DC choke. This DC choke is responsible for a significant drop in harmonics. By comparing total harmonic distortion in current (THDi) :
ATV340D22N4/E has THDi above 100% in HD (at 400V/50Hz)
ATV350D30N4E has THDi below 48% (at 400V/50Hz)
To express the exact ratio between ATV340D30N4E and ATV340D22N4(E) line current look at attached file.
Publié pour: Schneider Electric Belgium
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