(1) The automatic switch, DSE7420 discount, which requires both electrical chain, but also with a mechanical interlock, two-way all the way into the line outlet structure ensure that the entire circuit can be only one power supply is turned on, DSE7420, while avoiding the two-way power ON counter-transmission. Automatic switch having "IO-II" three positions, the bulk DSE7420, facilitate circuit maintenance, and set three remote monitoring interface and implement software, easy to monitor switch automatic switching and manual switching. (2) the unit automatically shut down and manual shutdown should have two normal stop and emergency shutdown. Prelubrication (3) of the unit, starting and stopping, FM and voltage, power transmission, and power failures should be able to manual control. Three-phase generator current calculated? A:. I = P / (√3 Ucos φ) that is current = power (watts) / (√3 * 400 (V) * 0.8) Simple calculation formula is: I (A) = Unit Rated Power (KW) * 1.8 the apparent relationship between power, active power, rated power, maximum power, economic power between? A: 1) The unit of apparent power KVA, our habits for the expression of transformer and UPS capacity. Original DSE7420_ deep sea (Online) _DSE7420 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.