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.
게시 대상:슈나이더 일렉트릭 Korea
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.
게시 대상:슈나이더 일렉트릭 Korea
