Greencisco 400Hz variable frequency converters are with parallel fuctions, sharing current, master and slave function [ one frequency converter is working, the others are standby functions],with LED and LCD touch screen display, adopt many world-class technology of our company. With RS485 communication function and 5MHz optical fiber transmissions,with the functions of remotely monitored and controlled by customer's central monitor system on the ships. Successfully passed testing and commissions on the warships of Navy customers.