Wrong grounding method of 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 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 the fixing parts such as screws will gradually loosen due to thermal expansion and contraction of temperature difference. 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.