8 details for the installation and use of outdoor LED large screen
1. Install the steel structure
The design of steel structure should consider many factors such as wind load, waterproof, dustproof, lightning protection, surrounding population density and so on. At the same time, auxiliary equipment such as power distribution cabinets, air conditioners, axial fans, lighting, etc., as well as maintenance facilities such as horse tracks and ladders, need to be placed in the steel structure.
Therefore, during the implementation, the entire outdoor screen steel structure should have design drawings that have passed the review of the competent government department to ensure the reliability and safety of the entire steel structure.
The erection of scaffolding is also an important part. Its design scheme must be rigorously demonstrated. At the site, it is also necessary to ensure construction specifications and timely detection to eliminate potential safety hazards during the erection process.
2. Standardize electricity consumption
According to the site temporary electricity specification (JGJ46-2005), the construction site must adopt a three-level power distribution system, a TN-S connection zero protection system, and a two-level leakage protection system.
It is also necessary to avoid the practice of making the three-level power distribution into two-level power distribution during the construction process, the wrong position of the PE line, the repeated grounding position and the number of times, so as to eliminate potential safety hazards as much as possible.
3. Waterproof and moisture-proof
Outdoor LED displays are often exposed to the sun and rain, wind and dust cover, and the working environment is harsh. Once the electronic equipment is wet or severely damp, it will cause short-circuit and other faults, and even fire.
Therefore, the screen body and the screen body, as well as the joint part of the screen body and the building, must first be strictly waterproof and leak-proof; secondly, the screen body must have good drainage measures, so that the water can be discharged smoothly in the event of water accumulation.
It is worth noting that the protection level (front/back) of the outdoor LED display is at least IP65/IP54 and cannot be lower than this protection level.
4. Ventilation and heat dissipation
When the outdoor LED display works, it will generate a certain amount of heat. If the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work properly, or even be burned, resulting in abnormal display.
Therefore, an axial flow fan (above the back of the screen) or other ventilation equipment should be installed to discharge heat, so that the internal temperature of the screen can be stabilized at -10°C to 40°C.
In addition, the selection of industrial-grade integrated circuit chips with an operating temperature between -40°C and 80°C can effectively prevent the system from being unable to start due to low temperature.
5. Use high-quality wires
The larger the area of the LED display screen, the greater the power consumption, and the higher the requirements for the stability of the power supply of the wire. The safety and stability of the wire can only be guaranteed if it meets the requirements of the national standard.
Among the many wire products, three points need to be emphasized: the wire core is a copper wire conductive carrier, the cross-sectional area tolerance of the wire core is within the standard range, and the insulation and flame retardancy of the rubber wrapping the wire core should meet the national standards.
6. Lightning protection grounding
Outdoor LED displays will also be attacked by strong electricity and strong magnetism caused by lightning, which requires good grounding measures for the LED main body and casing, and the grounding resistance is less than 3 ohms. In order to release the large current in time and reduce the overvoltage appearing on the equipment, lightning protection devices should usually be installed on the display screen and buildings.
For the grounding of the outdoor LED display, the grounding form should be considered according to the specific situation:
When the display screen is set independently, 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 outer wall of the building, the main body and shell of the display screen should be well grounded with the building, and shared with the building. The grounding resistance should not be greater than 1 ohm.
7. choose the appropriate power distribution cabinet
LED outdoor displays are generally powered by AC220V current, requiring grid voltage fluctuation less than 10%, and providing good system grounding. For the display screen with electric power exceeding 10kW, a special power distribution cabinet should be equipped. In order to prevent leakage fire, a fire leakage switch should also be installed at the main switch of the power inlet. The controller monitoring interface in the power distribution cabinet can display the real-time temperature in the display screen: in the automatic state, when the temperature inside the screen exceeds 65 degrees, the monitoring screen will prompt that the temperature is too high, and the controller will sound an alarm, and the system will automatically Power off to prevent fire.
In addition, smoke detectors can be installed in the display screen according to the actual situation. When a fire occurs in the screen, there will also be corresponding prompt information on the monitoring interface, and at the same time, it can also link the power distribution system to automatically cut off the power.
8. Safety education
Safety helmets, safety belts and safety nets are the three magic weapons to reduce safety construction accidents. On the construction site, the construction unit should require all personnel present to wear safety helmets correctly.
According to relevant data, the higher the level of workers’ safety education, the more perfect the safety education physique is, the probability of safety accidents is much lower than that of enterprises whose safety education is a mere formality.