1)mains hold,主电源同步2)synchronous test power source,同步电源3)mains synchronization,与电源同步4)synchro drive of voltage adjustment with seperated power-supply,分电源调压同步5)sychro drive of magnet field adjustment with co-power-supply,共电源调磁同步6)master slaver motor synchronous,主从电机同步
