Most of the friends who are new to LED large screens are confused - where should the delay switch be installed? Last month I encountered something funny and funny: a new large screen in a shopping mall was installed, and an electrician stuffed a delay switch into the innermost part of the distribution box, but every time he debugged, he had to remove half of the wall. Today we will talk about something real, and you will be half an expert after reading it.

1. If you choose the wrong switch position, something big will happen

You may not believe it if you say it. Last year, a new screen in a cinema was installed and the power module was burned after just three days of installation. Later, it was found that the delay switch was installed behind the rectifier, and the current rushed back and broke through the circuit board when the power was cut off. Here is the key point:​The delay switch must be installed between the main power supply and the distribution cabinet​​, it is similar to the location of the fuse at home.

Common installation location comparison table:

2. The debugging time is not determined by the browsing

The most outrageous operation I have ever seen is that the worker sets the delay to 30 seconds, and the screen turns out to be black seven or eight times a day. Here is a formula to remember:​Delay time = (screen startup time + 2 seconds)​​. For example, it takes 8 seconds for your large screen to be powered on to light up, and then the delay is set at least 10 seconds.

Different scene reference settings:

• ​​Mall Advertising Screen​: 12-15 seconds (both power saving and quick wake-up)
• ​Stage rental screen​: 8-10 seconds (requires quick response to performance instructions)
• ​​Sports Stadium Screen​: 18-20 seconds (prevent frequent start and stop damage to the lamp bead)

3. Don't step on these pitfalls

Last week, I went to inspect an old screen that had been installed for three years and found that the cooling holes of the delay switch were blocked by dust. Remind you:​Clean the switch heat sink at least once a month​​, especially outdoor equipment. There is another common mistake - using ordinary air switches instead of professional delay switches, which is like chopping wires with a kitchen knife, and sparks will come sooner or later.

Parameters that must be noted:

1. ​20% margin must be reserved for load current(For example, the total power consumption of the screen is 100A, and the switch must be 120A)
2. ​​Protection level is at least IP54​​(The best choice for outdoor installation is IP65)
3. ​​Number of operations > 100,000 times​(Don’t buy miscellaneous goods with cheap prices)

Self-question time

Q: What should I do if I have installed the wrong position?
A: Turn off the power and reinstall it quickly! For temporary remedies, reverse diodes can be installed, but they can treat symptoms but not root causes. I have seen an engineer installing a magnetic relay in the wrong position, but the contact point burned in three months.

Q: Can I install the delay switch by myself?
A: You can try a low-power indoor screen, but​You must find a licensed electrician to operate the outdoor large screen​​. Last year, a customer modified it himself, and connected the wrong zero-fire wire, resulting in the scrapping of the entire screen, which was enough to buy five new switches.

Editor's opinion: The delay switch looks inconspicuous, but it is actually a "safety guard" of the large screen. It is better to spend 200 yuan to buy a good switch than to save this little money to bet on luck. After all, the money for repairing the screen is enough to buy twenty top-level delays. Do you think this account is worth it?

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