You are currently viewing the content available in Vietnam. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
The RMS value of line current is affected not only by Altivar size but also by harmonics.
In drives up to 22kW (up to D22N4/E), the charging current during ATV 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 when comparing:
ATV340D22N4/E with THDi above 100% in HD (at 400V/50Hz)
ATV350D30N4E with THDi below 48% (at 400V/50Hz)
To express the exact ratio between ATV340D30N4E and ATV340D22N4(E) line current look at attached file.
In drives up to 22kW (up to D22N4/E), the charging current during ATV 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 when comparing:
ATV340D22N4/E with THDi above 100% in HD (at 400V/50Hz)
ATV350D30N4E with THDi below 48% (at 400V/50Hz)
To express the exact ratio between ATV340D30N4E and ATV340D22N4(E) line current look at attached file.
Released for:Schneider Electric Vietnam
