When both the first and second connection changing switches are closed, the interconnection of the stator windings becomes a parallel Y connection in which {TAIL ~ the phase difference} produced is {HEAD ~ 60°} 
When both the first and second connection changing switches are closed , the interconnection of the stator windings becomes a parallel Y connection in which { TAIL ~ the phase difference } produced is { HEAD ~ 60 ° }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD