LED display for frequent trips? It turned out to be caused by these reasons

Why is the LED display frequently tripping? Here's a simple analysis of frequent LED trips. Hope to solve your LED display trip problem.
Leakage protector layout is not reasonable
Due to the special features of the LED display installation site, such as incorrect wiring, broken lines, damage to the leakage protector inside the switch box, and some electrical appliances that do not pass through the switch box, as well as the inevitable malfunction and rejection of the leakage protector itself. In addition, the leakage protection device was not arranged according to the actual electricity situation, resulting in frequent tripping of the total leakage protection device.
In addition to strengthening management, it is also necessary to rationally arrange the leakage protector according to the actual situation from the technical point of view. The leakage protection device on the main power supply of the incoming line can be mainly used as a total protection against electrical fire hazards and electrical short-circuits. It also serves as backup protection for each small leakage protection range. Its rated leakage action current can be between 200 and 500 mA. Interval selection, rated leakage action time can choose 0.2 ~ 0.3s. In this way, the influence of surge voltage, surge current, and electromagnetic interference on the total leakage protector can be greatly reduced, and the selectivity and reliability of the total leakage protector action can be improved. If the secondary leakage protection within each leakage protection range can be effectively protected, the frequent tripping probability of the total leakage protector on the construction site can be greatly reduced.
There is no effective secondary or tertiary leakage protection within the scope of protection
The last-stage leakage protector in the switch box is the main protection of the power equipment. If the last-stage leakage protector is not installed, damaged or improperly selected, it may cause frequent tripping of the upper leakage protector. Because there are many metal conductors in the LED display, there are many wire joints. If the wire insulation is not very good, it will lead to frequent leakage; some also add some sockets, in many cases do not install the leakage protection device, often causing leakage . Only by forming an effective secondary or tertiary leakage protection mode within each protection range can the frequent tripping of the leakage protector be effectively reduced.
Leakage protectors have their own limitations
(1) Current leakage protectors, whether of electromagnetic type or electronic type, use magnetic induction voltage transformers to pick up leakage currents in the main circuit of the electrical equipment. Three-phase or three-phase four-wires cannot be completely balanced in the magnetic ring. The three-phase power load of the LED display cannot be completely balanced. Under high current or high overvoltage, a certain electromotive force is induced in the magnetic ring with high magnetic permeability. This electromotive force is large enough to a certain extent. , it will cause the leakage protector to trip. Because the larger rated current leakage protector uses a relatively large magnetic ring, the generated leakage magnetic flux is also relatively large, and the leakage current must overcome the magnetizing force of the magnetic ring itself, resulting in a larger rated current of the actually used leakage protector. The lower the sensitivity, the greater the rejection rate.
(2) The leakage protector has a zone of undefined operation between the rated leakage action current and the rated leakage action current. When the leakage current of the leakage protector fluctuates in this area, the leakage protector may trip irregularly.
Leakage protector selection is unreasonable
(1) The rated leakage current used in the switch box exceeds 30 mA or is more than twice the rated current of the equipment, or a time-delay type leakage protector is used because of the rated leakage current. Improve or protect the decline of the sensitivity, leakage leakage occurs, the last stage leakage protector does not operate, the upper leakage protector may act
(2) The starting current when the LED display is powered on is often relatively large. This large current may trip the leakage protector. Therefore, the display box should be powered up in batches as much as possible. In addition, electromagnetic leakage protectors that are less sensitive to surge overvoltages and overcurrents should generally be selected; or electronic leakage protectors that are 1.5 to 2 times larger than the rated current should be selected, but as the last stage leakage protection, rated leakage action The current should not exceed 30mA.
In short, the frequent tripping of the leakage protector is the result of a combination of various factors. The most important thing is to rationally arrange the leakage protector, reduce the protection range of the second or third class leakage protector, and correctly select the leakage protector and the wiring so that each The second or third-order leakage protectors in the scope are in effective protection status; on the other hand, it is to strengthen the management of electricity use and improve the quality of the electricity users through training, and eliminate the non-electrical wiring, so that the safety of the electricity can be improved. It can also reduce the frequent tripping of the leakage protector and create better power supply conditions for the normal operation of the LED display.

CO2 Welding Wire Production machine

WELDING WIRE DRAWING AND CUTTER MACHINE LINE

1-ROD WIRE PRETREATMENT(PAY OFF+DESCALER MACHINE+SAND BELT MACHINE)

2-ROUGH WIRE DRAWING MCHINE LZ560

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4-THE FINISHED WIRE Φ2.50X350 Φ3.25X350 Φ4.0X450mm.

WE CAN MAKE THE WELDING WIRE ACCORDING TO THE BUYERS REQUIREMENTS

5.THE FIRST YEAR SERVICE INCLUDE THE SPAREPART IS FREELY SERVICE(BUT NOT INCLUDE THE BUYERS DELIBERATELY BREAKS THE MACHINE OR PARTS),THE SECOND AND THIRD YEAR JUST PAY THE PARTS COST.THE SELLER MUST OFFER THE LIFE-SERVICE FOR THE MACHINE LINE.

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THE SELLER MUST OFFER THE ELECTRICITY MAP,TOUCH SCREEN,AND MANUAL BOOKS,MAINTAIN BOOKS,AND OTHER TECHNICAL DETAILS WITH ENGLISH.TRAIN THE BUYERS WORKERS TO MASTER THE MACHINE

7.SEA WORTHY PACKING, BIG MACHINES WRAPPED WITH PLASTIC NYLON, SMALL MACHINES AND PRECISION MACHINE MUST PACKED IN PLYWOOD BOXES THEN FIXED IN THE CONTAINER

LZ600 wire drawing machine

1. 1 Professional and technical personnel are required to carry out installation and commissioning. Before use, it is necessary to carefully read this manual and the relevant electrical instructions provided.

1. 2 Each machine and electric control cabinet shall be reliably grounded with a grounding resistance not more than 4Ω.

1. 3 There should be no accumulated water on the table top, especially near the operation box, as it can easily lead to circuit failure due to water infiltration.

1.4 It is prohibited for multiple people to operate the same equipment at the same time to avoid accidents.

1. 5 The electric control cabinet should be placed in a clean and dry room, and the door should be closed when working to prevent dust intrusion from causing device performance degradation or failure. Air conditioning is used to maintain the ambient temperature of the electric control cabinet. Frequently check the operation of the cooling fan on the top of the electric control cabinet.

1. 6 Before starting the machine, check whether the safety device is normal.

1. 7 Do not operate the components in the electrical cabinet with power. After cutting off the main power supply, wait at least five minutes, and wait until the intermediate circuit capacitance is discharged before operating the frequency converter, motor, or motor cable.

1.8 Do not touch the IC circuits on the inverter control interface board and motor control board, as static electricity may damage these circuits.

1.9 Please provide the power supply and operating environment according to the technical requirements of Section 3.2. It is not allowed to arbitrarily change the parameters of the frequency converter and PLC. The user shall be responsible for any damage to electrical components caused by human factors.

The second Delivery inspection

2. 1. Check whether the equipment is damaged and complete upon delivery (according to the packing list). If there is any damage or inconsistency with the contract, please contact the dealer or manufacturer immediately.

2. 2 The manufacturer is only responsible for quality issues arising during production, and is not responsible for damage caused during unpacking, improper installation and use, or damage caused by overload operation.

2. 3 After unpacking, the accompanying documents should be properly kept, as they are necessary during equipment installation, commissioning, and use.



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