介绍
Behind all the wonderful presentations of the LED显示屏, a stable and reliable power supply is indispensable. Electricity is the core energy that drives the normal operation of the outdoor LED display.
So, if you want to install an LED display, the first thing to consider is definitely electricity. So, what are the requirements for electricity in the place where the outdoor LED display is installed? This article will help you to understand.
1. Basic power supply requirements for LED display
Speaking of 户外LED显示屏, it is a beautiful landscape in the city. Whether it is neon advertisements at night or live broadcasts of sports events, they are inseparable.
However, do you know? Behind these cool display screens, there is a set of strict requirements for power supply!
1). Voltage and current, to be stable
First of all, we have to know that outdoor LED displays are usually powered by the kind of AC110V to AC240V electricity at home. This is just like when we plug in an electric kettle, air conditioner, etc.. It is this voltage.
However, this electricity is not random, and it must be stable! The fluctuation of the grid voltage must be controlled within 10%. Otherwise, the LED display may “get angry,” such as the brightness flickers or simply turning off.
Especially for those high-power display screens with a power of more than 1 kilowatt, a step-down starting device must be added, just like a “buffer” for the LED display screen, so that it will not be so “impulsive” when starting, protecting the circuit and equipment from damage.
2). Power supply line, safety first
Let’s talk about the power supply line, which is a big deal about your power safety. The power supply connection point must be hidden inside the LED display screen, not exposed to people outside, to avoid electric shock.
The power supply line is the live wire, the neutral wire, and the ground wire. None of them can be missing. The live wire is the source of electricity, the neutral wire is the return line of electricity, and the ground wire is like a safety net for electricity. In case of leakage, it can conduct electricity in time to protect you from harm.
In addition, the communication line and the power line must be separated, and don’t let them squeeze together. Communication lines are responsible for transmitting signals, and power lines are responsible for transmitting electricity.
Mixing the two together is like driving on a highway while chatting and driving. It is easy to get into trouble. So, for safety reasons, let them go their own way!
In short, there are many power supply requirements for outdoor LED displays, but they are all to ensure that they can work steadily and bring you better visual enjoyment. Therefore, when installing and using them, you must strictly follow these requirements, and don’t leave them “hungry” or “overloaded” so that they can accompany you for a longer time!
2. Design and selection of power distribution system for LED display screen
If the LED display screen wants to light up, the power distribution system is the key. Just like electricity is used at home, there must be a main switch (distribution box), the wires (bus wiring) must be connected, and finally, the electricity must be distributed to each electrical appliance (power distribution).
Next, let’s talk about how to design and select the power distribution system for the LED display screen.
1). Selection of distribution box
The distribution box is like the “heart” of the LED display screen, and you have to choose a suitable one. How to choose? First, we need to see the maximum power of the entire screen and then choose the distribution box based on this power.
The capacity of the distribution box must be large enough not only to be able to carry the maximum power of the screen but also to leave some “room” (redundancy) just in case. In this way, even if the power of the LED display screen fluctuates a little, the distribution box can cope with it easily and will not “strike.”
2). Bus wiring
Bus wiring is like “taking blood vessels” for LED display screens. We use a three-phase, five-wire wiring scheme. The five wires are three live wires (L1, L2, L3), one neutral wire (N), and one ground wire (E).
The live wire is responsible for power transmission, the neutral wire is responsible for power return, and the ground wire is for safety protection. How do you choose the wire diameter? This depends on whether the power supply inside the box has a PFC circuit (power factor correction circuit).
If it has a PFC circuit, the current will be more stable, and the wire diameter can be smaller; if not, then you have to choose a thicker wire to ensure that the current is unimpeded and there will be no “traffic jams.”
3). Distribution of power distribution
Power distribution is like “dividing the cake” for the LED display. It must be reasonably distributed according to the arrangement and combination of the screen and the maximum power of each box.
For example, if the display is rectangular, it can be divided by rows or columns; if the power of each box is similar, it should be evenly distributed.
The key is to ensure that the current load of each row or column is balanced and that there is no “one-sided” situation. In this way, the LED display can light up evenly without partial overbrightness or over-darkness.
In short, the design and selection of the power distribution system of the LED display is not a trivial matter, and it must be “tailored” according to the actual situation. Only when the power distribution system is stable and reliable can the LED display play the best effect and bring us a shocking visual experience.
3. Special power requirements of LED display
The LED display is not just a bright “big face”; it also has a complex set of power requirements. Power issues must be particularly careful for those large outdoor display screens.
Next, let’s talk about the special power requirements of LED display screens.
1). Peak power consumption and power distribution cabinet
When the peak power of the LED display exceeds 20 kilowatts (KW), things become less simple. At this time, it is recommended to use a power distribution cabinet with a distributed step-by-step power-on function.
This type of power distribution cabinet is like a “smart switch” that can power the display screen step by step in a predetermined order, avoiding the current shock generated when high-power equipment is started and protecting the circuit and equipment.
Moreover, there must be room for the power selection of the power distribution cabinet. Generally speaking, the power of the power distribution cabinet must be at least 1.3 times the peak power of the screen. Why is this?
In addition to the display itself, additional power consumption, such as computers, video processors, audio amplifiers, and cooling equipment, must also be considered. Although these devices are not powerful, they add up to a considerable expense. Therefore, when choosing a power distribution cabinet, you must leave some “margin” to ensure sufficient power supply.
2). Lightning protection and grounding, safety first
Outdoor LED display screens are directly exposed to “natural disasters.” Especially lightning, which is a big threat. Therefore, lightning protection and grounding are particularly important.
First of all, you have to set up a separate grounding system for the LED display screen, and the grounding resistance cannot be greater than 4 ohms.
In this way, if lightning strikes the display screen, the current can be quickly introduced into the earth through the ground wire to protect the display screen from damage.
If the display screen is attached to the outer wall of the building, it must also maintain a good grounding connection with the building.
At this time, the grounding resistance requirement is higher and cannot be greater than 1 ohm. Because the building itself is a large conductor, if the grounding is poor, lightning may be transmitted through the building to the display screen, causing damage.
Finally, the equipotential connection must be used. Simply put, it connects the display screen, the building, and the earth to form an equipotential body.
In this way, even if lightning strikes a certain part, the current will be evenly distributed in this equipotential body and will not cause local overvoltage, thereby protecting the safety of the display screen and personnel.
In short, the special power requirements of the LED display screen are not small, but they are all to ensure its stable operation and our safety. Therefore, when installing and using it, you must follow these requirements and don’t let them become “safety hazards.”
4. Power safety and protection measures for LED display screens
Although LED display screens are cool, power safety is a big deal. Just like when we use electricity at home, we must always be careful to prevent accidents.
Next, let’s talk about the power safety and protection measures of LED display screens and see what “black technology” is there to protect them.
1). Fire-proof leakage switch, the first line of defense for safety
Imagine that if the LED display screen leaks electricity, it would be really scary! In order to prevent this from happening, we installed a “fire-proof leakage switch” at the main switch of the power supply line. This little gadget is amazing.
It can monitor the current in the circuit at all times. In case of leakage or abnormal current, the power supply will be immediately cut off to prevent fire. It’s like equipping the display screen with a “safety guard,” making us feel more at ease when using electricity.
2). Temperature monitoring and alarm, prevent problems before they happen
When the LED display screen is working, it will generate a certain amount of heat. If the temperature is too high, it will not only affect the display effect but also cause safety accidents such as fire.
Therefore, we equipped the LED controller with a “temperature monitoring and alarm” function in the power distribution cabinet. This function is very smart. It can display the temperature on the LED large screen in real-time, just like installing a “thermometer” on the display screen.
Once the temperature exceeds the safe range, the system will automatically cut off the power and sound an alarm to remind us to deal with it quickly. In this way, we can find and solve the problem in time to prevent the situation from escalating.
3). Intelligent control makes management easier
Now, everything is about intelligence, and the power management of LED display screens is no exception. We can choose a power distribution cabinet with a remote control function or a PLC (programmable logic controller) control function.
In this way, we can monitor the power situation of the display screen anytime and anywhere through smart devices such as mobile phones and computers. For example, you can check parameters such as current, voltage, and power, remotely control the power on and off, adjust the brightness, etc.
This is like equipping the display screen with a “smart brain,” making it easier and more convenient for us to manage.
In short, power safety and protection measures for LED display screens are indispensable. With the blessing of these “black technologies,” we can ensure the stable operation of the display screen while ensuring the safety of personnel and equipment.
Therefore, when installing and using LED display screens, you must pay attention to these protective measures!
结论
In summary, the installation and operation of outdoor LED display screens put forward strict and comprehensive requirements for power supply.
From basic power supply parameters to complex power distribution system design, from meeting special power needs to comprehensive guarantee of power safety, each link is indispensable and together constitutes the cornerstone of stable operation of outdoor LED display screens.
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