Does the air switch of LED display frequently trip? When using full-color LED display, especially full-color LED display, the air switch frequently trips, which is extremely annoying. What is the reason? How to break it? Hongqiang, a manufacturer of LED display screens in Shandong,
First, the layout of leakage protector is unreasonable.
The layout of the leakage protector is unreasonable. Due to the particularity of LED full-color display screen installation, such as line damage, and the movement of the leakage protector itself, the leakage protector will trip frequently. How to solve it? In addition to strengthening management, leakage protectors should also be arranged reasonably according to the actual situation. As the general protection against electrical fire and short circuit, the rated leakage action current of the leakage protector can be selected between 200 and 500 mA, and the rated leakage action time can be selected between 0.2 and 0.3 s.
Second, the LED display screen has no effective secondary or tertiary leakage protection.
Because there is no effective secondary or tertiary leakage protection within the protection range, the last leakage protector in the switch box is the main protection of electrical equipment. If the last leakage protector is not installed, damaged or improperly selected, it may lead to frequent tripping of the upper leakage protector. Therefore, only by forming an effective secondary or tertiary leakage protection mode in each protection range can the frequent tripping of leakage protectors be effectively reduced.
Third, the power load of LED display screen cannot be completely balanced.
At present, the leakage protector for LED display screen, whether electromagnetic or electronic, uses magnetic induction voltage transformer to pick up the leakage current in the main circuit of electrical equipment. It is impossible to completely balance the three-phase or three-phase four-wire in the magnetic ring, and it is impossible to completely balance the three-phase power load of LED full-color display screen. Under high current or high overvoltage, the magnetic ring with high permeability will induce a certain electromotive force. If the electromotive force is large enough, the leakage protector will trip. In addition, the leakage protector has an uncertain action area between the rated leakage action current and the rated leakage non-action current. When the leakage current of the leakage protector fluctuates in this area, it may lead to irregular tripping of the leakage protector.
Fourthly, the choice of LED display protector is unreasonable.
Unreasonable selection of leakage protector for LED display screen may also lead to its open circuit tripping. The rated leakage action current used in the switch box exceeds 30MA or more than twice the rated current of electrical equipment, so the time-delay leakage protector shall be selected. Due to the increase of rated leakage current or the decrease of protection sensitivity, the superior leakage protector may act, resulting in tripping.
To sum up, we can know that there are many reasons for the trip of full-color LED display screen. Therefore, in order to solve the problem of frequent leakage, it is necessary to rationally arrange leakage protectors, narrow the protection range of secondary or tertiary leakage protectors, and correctly select wiring and leakage protectors. In addition, it is necessary to strengthen power management and improve the comprehensive quality of power users, which can not only improve power safety, but also solve the problem of frequent tripping of leakage protectors.
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