(6) The reverse power protection (7) generator leakage protection (8) generator phase sequence detection and protection (9) Engine low oil pressure protection (10) engine high temperature protection (11) Low coolant level protection (12) failed to start Alarm (13) low fuel level alarm (14) low fuel level protection (15) high battery voltage alarm (16) Low battery voltage alarm (17) Charge power system fault message "two votes, three systems" specifically mean? A: Two tickets means work sheet and operating votes. DSE4520 sea. That is in the power equipment of any work operation. DSE4520 production. It must first obtain work sheet and operating head of the ticket issued by the duty. The parties must be performed ticket. Third System refers to the shift system, mobile inspection system, the device periodically switching system. DSE4520 wholesale, deep sea (online consultation), DSE4520 provided by the Dongguan City, South City Zhongxin Electrical and Mechanical operation. Dongguan Nancheng Zhongxin Electrical and operating (zhongxin888.net.cn) Dongguan, Guangdong, industrial products leader, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Zhongxin Electrical and Mechanical leadership with the staff warmly welcome all inquiries negotiations to create a better future for electromechanical faithful.