Standard grounding method for full-color LED display screen
Customers often use the wrong grounding method to ground the LED display screen. Common ones are:
1. It is considered that the lower end of the outdoor column structure is connected with the earth, and it is not necessary to ground the display screen.
2. It is considered that the power supply is locked on the box, and the box is connected with the structure through the lock, so the grounding of the structure is both the power supply and the grounding.
Both methods of LED display screen have misunderstandings. Our columns are connected by anchor bolts, which are buried in concrete. The resistance of concrete is in the range of 100-500. If the grounding resistance is too high, the leakage current will not discharge or remain in time. Paint is sprayed on the surface of our box. Paint is a bad conductor, which will lead to poor connection and grounding contact of the box or increase grounding resistance, and may cause electric sparks to interfere with screen signals. With the passage of time, the surface of the box or structure will be oxidized and rusted, and the fixed parts such as screws will gradually loosen with the expansion of heat and contraction of temperature difference. The grounding effect of the structure will weaken or even fail completely. Form a safety hazard. Lead to leakage, electric shock, chip interference and other safety accidents.
what should the standard grounding of LED display be like?
1. There are three terminals at the power input, namely, live terminal, neutral terminal and grounding terminal. The correct grounding method is to connect all ground power terminals in series, lock the grounding with special yellow-green double-color wires, and then lead them out and connect them to the grounding terminals.
2. If there is no grounding terminal on site, it can be connected to iron tap water pipe or iron sewage pipe and other pipes with good contact with the ground. In order to ensure good contact, the terminal should be welded on this natural grounding body, and then the ground wire should be locked on the terminal, and binding connection is not allowed. However, gas and other flammable and explosive pipelines shall not be used. Or buried grounding body on site. 3. The grounding body can be made of angle steel or steel pipe, buried horizontally or vertically in the ground as a simple grounding point, and the grounding point should be selected in a remote place to avoid pedestrians or vehicles damaging the grounding body.
4. When we are grounded, the grounding resistance of the LED display screen must be less than 4 ohms to ensure that the leakage current can be discharged in time. It should be noted that due to the diffusion of grounding current, it takes a certain time for lightning protection grounding terminals to discharge lightning current, which will lead to the rise of grounding potential in a short time. If the LED display screen is connected to the lightning protection grounding terminal, the grounding potential is higher than the display screen, and the lightning current will be transmitted to the display screen along the ground wire, causing equipment damage. Therefore, the protective grounding of LED display screen shall not be connected to the lightning protection grounding terminal, and the protective grounding terminal must be more than 20 meters away from the lightning protection grounding terminal. Prevent ground potential counterattack.
Summary of grounding precautions for LED display screen:
1. Each power supply must be grounded from the grounding terminal and locked.
2, grounding resistance shall not be greater than 4.
3. The ground wire is the only conductor, and it is forbidden to connect the zero wire. 4. No holes or fuses shall be installed on the grounding wire.
5. The grounding wire and grounding terminal should be more than 20 meters away from the lightning protection grounding terminal.
led display,lcd screen,led screen
