Ronk Type 4HE-AA Add-A-Phase Power Converter for 10-50HP, 480V Motor
The Type AA unit is designed to handle loads as listed above and many others. Equipment whose loads vary more than 50% can be efficiently run on this type unit. Using a Type AA on these type loads is both effective and efficient especially under light load conditions. This type unit requires no special starting circuits to "come up to speed" and are very quiet running which is an advantage for indoor applications such as elevators. The Type 4HE-AA models convert a single phase 480 Volt to a three phase 480 Volt.