Often users use wrong grounding methods to ground the full-color LED display.
Wrong grounding method for full-color LED display
1. It is considered that the lower end of the column of the outdoor column structure is connected to the ground, and there is no need to ground the full-color LED display.
2. Lock the power supply on the box body, and connect the box body and the structure with a lock, so that the grounding of the structure means that the power supply is also grounded. Both are misunderstood. The company uses column base and anchor bolts for connection, and the anchor bolts are buried in concrete. The cement resistance is between 100-500. If the grounding resistance is too high, the discharge or leakage residue cannot be timely. The company sprays paint on the surface of the cabinet. The paint is a poor conductor, which will cause poor connection of the cabinet or increase the grounding resistance, and may cause electric sparks to interfere with the screen signal. Over time, the surface of the box or structure will be oxidized and corroded, and fixing parts such as screws will gradually loosen due to thermal expansion and contraction of temperature differences. The grounding effect has little impact on the building, or even completely fails. Create safety hazards. Cause leakage, electric shock, chip interference and other safety accidents.
Full color LED display
Standard grounding method for full-color LED display
1. There are three wiring terminals at the input end of the power supply, namely the live terminal, the neutral terminal and the ground terminal. The grounding method is correct. All the ground wire power terminals should be connected in series, and the dedicated yellow and green two-color wire should be used to lock the ground, and then lead to the ground terminal.
2. If there is no ground terminal on site, it can be connected to iron water pipes, iron sewage pipes and other pipelines that are in good contact with the ground. In order to ensure good contact, the terminal should be welded to this natural grounding body, and the ground wire should be locked and not connected. It is forbidden to use gas and other flammable and explosive pipelines. Or bury the grounding body on site.
3. The grounding body can be made of angle steel or steel pipe, and is simply buried in the ground horizontally or vertically. The grounding body should be selected in a remote area to prevent pedestrians or vehicles from damaging the grounding body.
When we are grounded, the grounding resistance must be less than 4 ohms to ensure timely discharge of leakage current. It is worth noting that due to the diffusion of ground current, it takes a certain time for the ground terminal to discharge the lightning current, which will cause the ground potential to rise in a short time. If the full-color LED display is connected to the lightning protection grounding terminal and the ground potential is higher than that of the full-color LED display, the lightning current will be transmitted along the ground wire to the display, causing equipment damage. Therefore, the protective ground of the full-color LED display cannot be connected to the lightning protection ground terminal, and the distance between the protective ground ground terminal and the lightning protection ground terminal must be 20 meters. Prevent the ground potential from hitting back.
An overview of the precautions for the grounding of the full-color LED display:
1. Each power supply must be grounded and locked from the ground terminal.
2. The grounding resistance cannot be greater than 4.
3. The ground wire is the only conductor, and the neutral wire is not allowed.
4. There must be no holes or fuses on the ground wire.
5. The distance between the ground wire and the ground terminal should be greater than 20 times the lightning protection wire.
