The controller is small in size and more flexible in installation. Two-wire wiring, easy to operate. It can be paired with NB module to realize the connection between the controller and the "Dean Cloud" Internet of Things platform, and the cloud monitoring intelligent early warning. The interface uses a 2.4-inch LCD with a resolution of 128×64 pixels in both Chinese and English to display real-time status data information. The controller can seamlessly switch between the active and standby power supplies, and has independent active and standby power indicators to show the working status of the power supplies. The controller power supplies share the same switch with the standby power supplies, and the standby power supplies do not need to be manually started. (Built-in backup power supply)