Part 1 Design of the Frame
1. The cabinet and the display
Dimension for the cabinet( as shown in Figure 1): 480mm X640mmX150mm :
As can be seen in the following Figure 2, a LED display screen comprises "m" rows and "n" columns of the cabinets. The front sizes of the cabinet are : 480*m X 640*n:
In order to make the installation work much easier and more convenient, we strongly recommend the users assemble the cabinets according to the serial number that we had put on the cabinets. As the following drawing shows, we have put the number label A1-1 at the upper right corner of the back cabinet. Other cabinets are numbered incrementally on the row and column in the same way. Figure 3:
2. Use of installation accessories
To ensure the correct installed position, the 4 adjacent cabinets are fixed with a bracket, as the following drawing shows.
Drawing of the backboard:
2.2 The Bracket
As shown in Figure 4, the bracket is used for fixing the installation plate to the pre-designed column bar.
The bracket and installation plate are installed onto the square bar. When the screws are not fastened, the bracket and the installation plate can slide in four directions. This is to allow precise positioning of cabinets.
Drawing of the bracket:
2.3 To install the positioning bar
Before installing any cabinet to the support structure, a positioning bar must be installed first so as to guarantee the horizontal level of the screen. This positioning bar is installed at the bottom of the support structure.
There are two types of positioning connecting bars: 1920mm long & 1280mm long. 1920mm is for connecting 3 cabinets in a string, while 1280mm is for 2 cabinets in a string.
Users can choose either type of the bars according to the number of the cabinets and dimension of the display for positioning and connecting. For example:
2.4 The fastener
To fix the brackets: bolt M10X50, SpacerФ10, Washer Ф10
To fix the cabinet: bolt M10X25, SpacerФ10, Washer Ф10
To fix the positioning bracket: bolt M10X25, SpacerФ10, Washer Ф10
Note: Metric system is used for all the thread and size of the bolts.
2.5 Water proof seal pipe
The water proof seal pipe is used to seal the connection hole that is used as a passage for the power and control cables.
2.6 Input cable seal pipe
Usually, the protecting input seal pipe is on the right side of the cabinet if you look from the back side. When the screen is very wide and there are many cabinets in a row, such seal pipes are found on both sides. These seal are used for protecting the power cords and the input signal wires from the signal distributor LDU 3000.
2.7 Signal wires (for the convenience of user installation, these cables are often packed inside the cabinets when leaving the factory)
Signal connection between the cabinets.
Note: The signal wires from LDU3000A HUB to the 1st column cabinets are usually packed in the HUB box.
2.8 Power cord.
Used to connect power between cabinets: 3X12AWG, L=1500mm
Notes: Power cables from the power distributor to the cabinets are not provided by the LED screen factory. Users have to prepare them according to the installation location.
3.1 Single pole supporting
Single pole supporting is ideal for the open area, which is flexible in installation and neat in appearance. This way of installation is less likely to be restricted by the location of installation or by the size of the display.
3.2 Two poles supporting
Two poles supporting can be considered if the display is large. This way of installation is not restricted by the location or the size, either. Usually, the display will be put together with other signs and have housing and border decorations.
3.3 Installed on a platform
In such way of installation, the screen is seated on a platform on a building. Under this circumstance, users have to consider the weight of the sign, wind area and the loading rate of the building.
3.4 Wall mounting
In this method of installation, the LED screen is attached to the wall of the building. Users need to pay attention to the loading rate of the wall.
4. Design of the main frame
4.1 Confirmation for the measurements of the display and size of the frame.
The dimensions of the display are determined by the resolution of the display or by the numbers of the modules (W XH). For the convenience of installation and housing or decorative structure, the size of the frame is usually built larger than the dimensions of the display ((W+230) X (H+210mm)),as the following drawing shows.
4.2 Example of the design for the main frame:
The main frame refers to the frame structure for supporting and assembling the cabinets.
4.2.1 Materials of the main frame
Under usual circumstance, the material and size of the main frame need to be determined at the installing location. In order to make the welding easier, we suggest the client use square pipes as the material.
The size of the vertical installing bar is determined by the size of the cabinet fixation bracket. The size should be moderate, neither too large nor too small. We suggest the size of 45mm X 45mm X 4mm (1 3/4" X 1 3/4" X 0.16") for these square pipes.
4.2.2 Since the front face of the main frame is the surface for attaching the display cabinets, users should pay attention to the horizontal distance (640mm) between the two vertical installing bars. Users should assure that the bars are perpendicular or parallel to each other. What is more, attention should be paid to the welding strength of the upper and lower beams.
4.2.3 Generally, the main frame will be assembled together with the display in house or in the factory. After testing, the frame and the display attached to it, shall be transported to the installation site. Then the whole structure shall be hung up, seated and welded to the site supporting structure.
4.2.4 If the display is a large one, for example, using more than 10X6 cabinets, we suggest that a thicker main frame be used. Necessary reinforcement is also desirable. Consulting an architect for professional advice on structure strength and construction is very important. Otherwise, the screen may be deformed during or after hoisting and installation.
4.3 Decorating the borders
If there is any decorating border or housing around the display, the separation gap between the cabinet and the wrapped border should be not less than 10mm. If the user has no plan to build any decorating border for the display, we recommend that the user take the frame that provided by the factory as the decorating boarder to cover the installation connecting bar.
4.4 Air flow and the heat radiation problem
Generally, a display with a simple structure which is exposed to the open air without a housing or enclosure is better for dissipating heat. When a display is built inside a wall or similar surface, or is enclosed in a housing , it will be necessary to consider dissipating heat from the structure. Shutter louvers, exhaust fans, or even air conditioners can be used for heat radiation. As is known to all, the hot air flows from below to the top. In this case, the air intake is designed at the bottom of the display, while the air outlet is on the top.
Users will be able to read the temperature of the display through the software. When the temperature of the display is up to 60℃, the control system will automatically turn the display to under the 50% brightness status. When the temperature reaches 70℃, the display will automatically turn to the black screen protection status.
4.6 Viewing angle of the display
Usually, the surface of the display is perpendicular to the horizontal plane.
In order to guarantee the viewing effect, sometimes the display needs to be tilted towards the front, especially under the following 2 circumstance:
1)When the location of the display is far too high for the viewer, and the viewing angle is beyond 25°;
2) The viewing distance is restricted due to the limited space. Users need to create a viewing angle between the display and the ground. A slanting angle installation can greatly increase the viewing effect.
4.7 Maintenance access
If the height of the display exceeds, for example, 5 stacks of cabinets (2400mm), we will have to think of making a maintenance access to make the service job easier.
The maintenance access, with the width of over 600mm, should be designed exactly in the middle of the two rows of the cabinets. To make the connection of the installation plate much easier to fix, the distance between the maintenance platform and the installation plate should be at least 100mm apart. See figure below:
