If there are 3 power (Ph1, Ph2 and Ph3) connections only, it cannot be a star connection; if there are four power connections (Ph1, Ph2, Ph3, N), it cannot be a delta connection. If there are six wires, it can be externally connected to be either a star or delta connection. Big motors often need to start in star mode (lower voltage across each coil) and once the motor picks up speed, it is changed to a delta (higher voltage across each coil) connection- usually done with motor starter.