L'industrie des écrans LED entre progressivement dans le rythme serré de la production et des ventes en plein essor. De plus en plus de produits de montage en surface extérieurs sont largement utilisés dans les aéroports, les bâtiments, les colonnes publicitaires extérieures et d'autres endroits. Avec le mode été haute température qui est successivement ouvert à travers le pays, l'environnement difficile Il teste également de plus en plus la résistance aux intempéries des écrans LED extérieurs.
Five methods for outdoor led display to deal with lightning strikes
1. A surge protector (SPD) must be installed first. When a spike current or voltage is suddenly generated in the electrical circuit or communication line due to external interference, the surge protector can be turned on and shunted in a very short time to avoid surges For damage to other equipment in the loop, the installed protector must be grounded separately.
2. For the lightning protection of the steel structure, connect the steel structure to the shell of the LED display and do a good grounding. The grounding resistance is generally required to be less than 4 ohms. If the resistance does not meet the requirements, additional artificial grounding should be done network.
3. For the lightning current induced on AC power lines and low-voltage DC power lines, install single-phase or three-phase power arresters and weak current arresters on the power lines. The cross-sectional area of the connecting wire of the phase wire cannot be less than 10mm square, and the cross-sectional area of the connecting ground wire cannot be less than 16mm square.
4. For the lightning current induced on the signal line, install a signal lightning protection device on the signal line. The signal lightning arrester is determined according to the signal interface of the system. If it is a network cable, install a network signal lightning protection device, and install a DB9 interface lightning protection device for the serial interface. The cross-sectional area of the ground wire cannot be less than 1.5mm square.
5. For the induced current of lightning strikes, a unified and dedicated professional distribution box and cabinet can more comprehensively and effectively protect the entire circuit system from the interference of lightning induced currents.
Efficient heat dissipation, cool for a summer
1. LED display within 20 square meters
It is generally not recommended to use air conditioners. If conditions permit, two fans with a diameter of about 300mm can be used, depending on the size of the installation space.
2. LED display more than 20 square meters
1) If the LED display is installed against the wall and can protrude one meter from the wall, it is recommended to select the fan according to the area, and the fan should be installed in sequence above the side of the screen. And when installing the fan, ensure that there is a net inside to prevent the technician who repairs the display screen from sucking clothes or other things in and causing personal injury when repairing the display screen. For waterproofing, the air outlet of the fan on the outside aluminum-plastic panel should be installed. Install aluminum shutters. The wall-mounted LED display screen can also be installed with air conditioners. Ensure that there is enough space for the air conditioner host without affecting the overall appearance of the wall. The choice of air conditioner is required, and 1.5P, 2P and 3P air conditioners are generally used. Northern cities use 20 square meters of 1P air-conditioning calculations; southern cities use 15 square meters of 1P air-conditioning calculations. If the area of the LED outdoor display is relatively large, the air conditioner needs to be customized.
2) If the installation method of the LED display is to use a column and use a fan to dissipate heat, the fan is installed on the top of the aluminum-plastic panel on the back of the large screen and made into blinds so that rain does not enter the display when it rains. If it is a dual-pillar LED display, you can open several blinds in the middle of the dual-pillar. This Baiye window is the air inlet, and the fan above is the air outlet, so that complete air convection is formed and the heat dissipation effect is better.
3) If the air conditioner must be installed, the purchase cost and use cost will increase. Although the heat dissipation effect will be better than that of the fan, the installation space of the external air conditioner must be considered, and whether the overall aesthetics can be guaranteed.
4) Install dust-proof nets on the vents and clean them frequently.
Waterproof, details are the key
The waterproofing of the display screen is mainly for prevention. The selected module must be an outdoor waterproof module, and the back of the module must be painted with three-proof paint. The selected cabinet is also a waterproof cabinet with good airtightness. The other part needs to be implemented in the concrete construction site; in the structural design, waterproof and drainage are combined; after the structure is determined, according to the characteristics of the structure, it can be considered to have a hollow bubble tube structure, a small compression set rate, and a breaking elongation rate. Sealing strip material with large performance; After selecting the sealing strip material, it is necessary to design a suitable contact surface and contact force according to the characteristics of the sealing strip material to make the sealing strip squeeze to a dense shape. In some locations where waterproof tanks are installed, focus on protection and dredging to ensure that there is no accumulation of water inside the display. Only in this way can the display screen be used in the rainy season without any quality problems caused by human factors.
