Probably what Fadal does when they configure a machine for single phase input is the same as Haas does on the MiniMill and their other small machines that can run single or three phase; use the same rectifier bridge and capacitor setup. This means that the incoming current is limited by the diode rating and the same amount of capacitance is used so there is less ripple smoothing. I know Haas rates the MiniMill at 10hp on three phase and 7.5hp on single phase and the only change bewteen the two inputs is how the incoming line connections are made. |