Release date: 2017-11-23 Source: led network share: Highway LED variable information board module aging step one, set of painted semi-finished products Third, module power supply line, module communication data line Label: Highway LED variable information board module aging step High Voltage Dc Contactor,Epoxy Seal Contactor,High Voltage Contactor Relay,Dc Switching Contactor NanJing QUANNING electric Co.,Ltd , https://www.quanningtrading.com Highway LED variable information board module aging step
1. The purpose of the casing is mainly the protective effect. In the painting process, it is inevitable that there is residual paint in the periphery of the PCB and the aperture of the positioning hole. Before the paint is dried, the semi-finished PCB is easily assembled into the bottom case, and the paint is dried and filled into the bottom case. It is easy to produce the top corner of the paint hard block and it is difficult to assemble.
2, the role of aging after painting first, one can be in the aging, the heat emitted by the device can make the drying time of the paint faster, in the welding process, the individual components are not easily found by the virtual welding, through the insulation effect of the paint, In the process of painting, it is easy to seep into the virtual solder joints, and it is easy to expose under the impact of current and temperature during the aging process, so as to realize the effect of early detection and early repair.
Second, according to the unit box arrangement is mainly for the number of control points of the distribution card (or unit box), followed by the power of the power supply, according to the actual use of the program simulation.
1. According to the actual power consumption of the LED variable information board module of the expressway, the power of the corresponding power is used. The total power of the module cannot exceed 80% of the power of the power supply. More than 80% of the power consumption may easily affect the life of the power supply or Burning the power supply;
2, module power line connection process, must distinguish the polarity of the power supply and the load on the power line, the general national standard power line limit standard: 1 square copper wire can withstand 10 amps of current, the actual use can only use 80% The power consumption calculation, otherwise the power cord is prone to hot or accelerated line skin aging, severe direct burnout, module wiring mainly to see whether the output voltage of the power supply meets the module's operating voltage, the wiring is clearly divided into positive and negative poles, and the polarity is connected. It will lead to the burning of the module device and the burning of the power supply, and even lead to the seriousness of the fire, so the medicine in the wiring process is cautious;
3. After the module DC power supply connection, according to the situation of municipal power distribution, the mains power supply of each group of power supplies is allocated, and the AC power supply line of the power supply cannot be blindly connected to the DC output terminal. After all the power supplies are connected to the live and neutral lines, It is necessary to add a reliable ground wire. The ground wire mainly serves as a protection function. The power supply generally has leakage problems. After the ground wire is installed, the leakage current is directly filtered out. This makes it safe to use and protects the device from strong electric power and AC. The power supply needs to refer to the parameters of the power supply and the parameters of the protection switch. It cannot be overloaded to avoid burning the power supply system.
4. The connection of the communication data line is mainly divided into the control definition of each pin of the signal line. It cannot be reverse inserted or misplaced, because some of the data lines are data lines with transmission power or detection power, misplaced or reverse inserted. This causes the device to burn out, so the short circuit between the lines must be avoided between the data line production processes.
Fourth, the assembly system control card
1. The control system and the distribution card are the main components of the aging control data. The power supply parameters, the electrode and the data routing mode of the component must be clear when the power is connected and connected to the data line. The normal working voltage of the control card is DC5V, special control. The card and the distribution card are transferred to the normal working voltage through the data line, and the control card usage instructions are carefully read during use.
2. The function of the distribution card is responsible for allocating the transmission data and feedback data of the unit module area, and issuing the command to control the data information of the display unit area.
Five, the instrument detects the power supply group, the sequential area power supply
1. After the power supply part is wired, use a multimeter and other instruments to check the wiring circuit. Verify that the power supply AC group and the DC output group cannot have a short circuit. The second step is the open circuit. During the detection process, check whether the terminal is tight or not loose. The terminal block and the terminal block screw must be tightened. If it is loose and easy to get off, it will cause accidents such as fire or short-circuit of the interface.
2. After the instrument detects no abnormality, the distribution area of ​​the phase electricity is the same as the listed power. At the same time, the display shows whether the display of the module is abnormal, and the abnormality is found. After the elimination, the power is restarted. switch;
3. After the power is turned on, the contents of the module through the system memory can be displayed normally. Finally, the working voltage of the power output is recalibrated with the voltmeter to adjust to the best effect.
6. Computer online control card The computer and control card are connected. Generally, it is divided into: port communication and network port communication. After connecting the system card, it can respond to the search data normally, indicating that the computer and the control card are connected normally, and send the test form or picture through the computer. The data is sent to the system control card, and the normal use of the detection is: sweeping, sweeping, oblique sweeping, monochrome, color mixing, text, image, etc. Sweeping, sweeping, and sweeping are the main check pixels between the pixels. Monochrome and color mixing mainly check whether there are blind spots and mixed LED lights in other pixels. The picture is mainly to check the correctness and activity of the display chart. 7. Performance and control detection, timing aging device, and various performance detection.
1. The use of control software and hardware will involve the handling performance of the product. Therefore, the following work must be completed in the aging process of the product to enter the aging state.
2, brightness control detection: using the brightness and gray level in the control software, manually from high to low, and then from low to high, the display module should adjust the high and low random changes accordingly;
3. Communication and power detection: Sending commands through the computer, the feedback data information can accurately determine whether the communication and working voltage of the unit module are normal. According to the detection feedback data coordinates, find the fault location of the unit display module. Analysis and overhaul;
4, out of control point detection: through the computer to send out of control points recycling instructions, can accurately determine whether each pixel in the unit module is working properly, the faulty pixel points on the computer display can accurately see the coordinate position of the fault point, According to the coordinate checking module of the fault point, it can be found that the pixel is short-circuited, open circuited, vf is abnormal, and the like;
5, through the above software detection, officially entered 4-8 hours of semi-finished products aging, through the playlists, loop playback, tracking the aging process at any time, and do a good job of data records;
6. In the above link, if there is a problem in some links, the fault identification must be done on the faulty module, and the records should be recorded. The module that displays the fault should be transferred to the repair station for analysis and overhaul;
7. After the aging time reaches the specified time, re-test the above-mentioned 1-5 items with the computer.
Eight, semi-finished products aging end After the above work, the faultless LED variable information board semi-finished products, orderly disassembly, tighten the power socket screws, neatly placed the qualified product classification area, and transfer to the next station.