Lao Zhang, the newly-entered installation master, has been in trouble recently - when installing a large LED screen in the mall, he stuffed the power box into the decorative column, and the power module was collectively burned three months later. This matter has exposed a common industry problem:​80% of power failures are caused by installation site errors​. Today we will look at this seemingly simple but hidden technical details.

1. Three major iron laws for selecting power sites

Don't be fooled by those "casually pretending" nonsense! Last year's industry report showed that​Faults caused by improper power position account for 47% of the total repairs​​. Remember these three golden guidelines:

1. ​​Vertical height range of 1.2-1.8 meters​(It not only prevents water accumulation and facilitates maintenance)
2. ​​Distance to the screen frame ≥30cm​​(Leave convection space for heat dissipation)
3. ​Avoid steel structure keels​(Electromagnetic interference will cause voltage fluctuations exceeding ±5V)

A real case of a chain convenience store: after installing the power supply behind the cash register, the electromagnetic interference of the coffee machine caused 18 modules to splash the screen. Later, the displacement was carried out according to the specifications, and the failure rate dropped by 83%.

2. Installation taboo table for different scenarios

I made a comparison table, and novices must save:

Key reminder:​Don't install outdoor screen power box on the south-facing wall​​! Direct sunlight will cause the temperature in the box to surge above 68℃, and the capacitor life will be cut directly in half.

3. Cracking solutions for special structures

I handled a weird case last week: the power supply of the curved screen cannot be found properly. Finally, I used this trick:

1. Split the power supply into 4 sets of modular units
2. Distributed equidistantly along the arc on the back of the screen (the spacing is ≤2.4 meters)
3. Install temperature-linked fan (it will start automatically after 45℃)

Although the material cost is 2,300 yuan more, the three-year operation and maintenance cost is saved by 18,000 yuan.​Modular power supply has another benefit​: A single fault will not cause the full screen to be black, and other areas will run as usual during maintenance.

4. These parameters determine the power supply life

Don’t just look at the location, the equipment itself must meet the standards:

• ​​Output ripple <50mV(Above this value, it will accelerate the attenuation of the lamp bead)
• ​​Load adjustment rate ≤±1%​(Water ripples will appear if the fluctuations are too large)
• ​​Standby power consumption <3W​(Save electricity and reduce heat generation)

I have a cold knowledge:​The screen with brightness adjustment should choose a wide voltage power supply​​(100-240V adaptation), especially in the site connected to the lighting system, voltage sudden change is common.

Editor's opinion: To be honest, I have seen too many projects that can save installation costs and plug the power supply, and finally double the maintenance costs. Remember—​A good location is the best insurance​! If you look at it carefully, which screens that have not had any problems for five years are not installed in accordance with the standards?

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