At full load (1500W output) that spindle should draw 220V * 7A * 1.732 = 2667VA from the VFD. Even if the VFD is 90% efficient, it would draw 2667VA / 0.9 = 2964VA from the service at full load. At 220V, that’s 2964VA / 220V = 13.5A (minimum 15A circuit). At 110V that’s 2964VA / 110V = 27A (minimum 30A circuit). A more reasonable 800W spindle would require about half as much.
7 Likes