The water supply system is the production of an important and indispensable part. Traditional large area of water supply, water pollution and easy, and more investment in infrastructure, but the main drawback is that water pressure can not be kept constant, resulting in some of the equipment is not working properly. Water supply equipment for the production equipment is a direct water supply, later put into operation, work year-round, during the period running basically no maintenance cycle, so the high-reliability requirements. Water supply device basically unattended, good performance requires the control system, not only can normally run automatically, timely protection and automatically resume normal operation after elimination of a fault should be recoverable fault condition occurs when the system is unrecoverable failure shall send an alarm, and to minimize downtime to ensure the continuous supply of the device.