Newbie who are new to LED screen installation may have been confused: Where should lightning arresters be installed? Is it installed on the top of the display or buried in the base? It looks like a metal box, why do you have to install it? Today we will talk about something real, and you will be sure to know how to operate after reading it. Remember this sentence first:​The lightning arrester is installed in the wrong position and it is equivalent to installing it in white. The entire set of equipment may be burned at critical moments​​。

I encountered an interesting thing recently - a newly-entered engineering guy asked in the forum "How can novices quickly master the installation skills of LED screen lightning arresters", but the comment area was a big fuss. Some people say it is installed on the top of the display screen, some say it is buried under the ground, and some say it is installed next to the distribution box. You see, even basic issues have so many controversies, no wonder novices are confused.

1. Lightning arresters are not decorations

Many people think that if the display screen is installed on the roof, it requires a lightning arrester, which is definitely a misunderstanding. The case in a commercial square last year is very telling: their floor-standing advertising screen is only 3 meters away from the ground, but it is still broken through the control card by lightning on thunderstorms. Later, the test found that​The display support frame directly contacts the concrete on the ground, and instead becomes a natural conductor that causes lightning.​。

Here is a key data to remember:​When the height of the display screen exceeds 2 meters of the surrounding buildings, the probability of lightning strike increases by 5 times​​. Don’t think it’s safe to install it at a low place. As long as we have a metal structure support frame, lightning arresters must be installed honestly.

2. Five must-install golden positions

Based on these years of practical experience, I have compiled a fool-like comparison table:

Special attention:​The lightning arrester in the distribution box must be installed before the air switch​. Some installation teams directly connect to the switch to save trouble, so that the lightning current will still burn the equipment along the line.

3. The most common pitfalls for beginners

Last week, a customer complained to me: Even though there was a lightning arrester installed, there were still snowflakes on the screen after the rain. When I arrived at the scene, I almost burst into laughter - the grounding wire of the lightning arrester was actually connected to the fire pipe! Here is the key point:​The grounding resistance must be <4Ω, and it is best to bury a 2.5-meter-deep grounding pile.​. If the ground wire is connected to water pipes and gas pipes, it will not only not be lightning-proof, but may also cause a second accident.

Another common mistake is spacing control. For example, for the curved screen installed on the roof, the minimum horizontal distance between the lightning arrester and the display screen should be maintained at more than 1.5 meters. The most exaggerated case I have ever seen is that the lightning arrester is installed directly against the screen, and as a result, when the lightning strikes, the arc is directly pulled and the fire starts.

4. Self-question and self-answer session

Q: Can the lightning arrester be installed behind the display screen?
A: If it is an indoor screen installed against a wall, it can be installed at the back maintenance port. But​Outdoor screen is absolutely not good​! The rainwater will seep into the box through the gaps in the lightning arrester, and it will definitely rust within three months.

Q: How to install multiple screens in series?
A: Remember the "three-point protection method": the first-level lightning arrester is installed at the main entrance of the distribution box, the second-level lightning arrester is installed at the power input end of each screen, and the third-level lightning arrester is installed before the signal receiving card. In this way, the lightning current will be weakened in segments, which is 10 times safer than single point protection.

5. Say something heart-wrenching

Nowadays, many manufacturers treat lightning arresters as gifts, but never use those three-no products. Last year, a batch of lightning arresters that were claimed to be "military-level" were removed, with only a varistor and a fuse inside, which cost less than 5 yuan.​​Qualified lightning arrester must have a flow rate of more than 35KA, and the response speed is ≤25 nanoseconds​. It is recommended to directly choose the lightning protection module provided by the display screen manufacturer, after all, they are the most familiar with the circuit characteristics of their own products.

Finally, please remind: after installing the lightning arrester, remember to check whether the grounding wire is rusted every quarter, especially for projects in coastal areas. Last time I went to inspect the stadium screen that had been installed for three years, and the grounding piles were so rotten that half of them were left. If you want to catch up with thunderstorms, you can't imagine the consequences...

Editor's opinion: Don't use lightning arrester installation as a joke, it is more important than you think. Spending half an hour to install correctly can avoid equipment losses of hundreds of thousands, which is a good deal no matter how you calculate this account.

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