The grounding method of LED manufacturing should be considered according to the specific situation; when the display screen is set separately, a separate grounding system should be set up, and the grounding resistance should not be greater than 4 ohms; when the display screen is attached to the external wall of the building, the main body of the display screen The enclosure should maintain a good grounding relationship with the building, and share the overall grounding with the building, and the grounding resistance should not be greater than 1 ohm.
The power supply system of outdoor LED display screens generally uses AC220V current power supply, which requires that the grid voltage fluctuation does not exceed 10% and provides excellent system grounding. For monitors whose power source exceeds 10kW, a special power distribution cabinet should be set up. The power distribution cabinet with remote control or PLC control function can be selected as required. The power distribution cabinet with PLC control function is more intelligent, and LCD controller can be used to remotely control Wuhan display screen production and in-screen air conditioners, fans and other equipment. The switch can also monitor the ambient temperature inside the screen and the brightness outside the screen in real time, with corresponding alarm information. Outdoor display screens generally have poor environmental conditions, and it is recommended to use a distribution box controlled by a programmable controller; indoor display projects have good environmental conditions and limited space, so they can be operated without a programmable controller.
In order to prevent a sudden leakage fire, a leakage fire switch should also be installed at the main switch of the power inlet. The LCD control and monitoring interface in the power distribution cabinet can display the temperature inside the display in real time. When the screen is in the automatic state and the temperature exceeds 65 degrees, the monitor screen will prompt that the temperature is too high, and the LCD controller will sound an alarm, and the system will automatically cut off the power to prevent fire. A smoke detector can be installed in the screen according to the actual situation. When a fire occurs in the screen, there will be corresponding prompt information on the monitoring interface, and it can also be combined with the power distribution network to automatically cut off the power.
