Focus on cold pressing terminal and wire harness production
How to detect terminal short circuit fault
Release time:
2023-10-16
The failure of the wire and the terminal may also be caused by a short circuit between the wire harness and the body (ground wire) or within the relevant switch. Before checking, first check whether the terminals of the body are firmly fixed, and then test according to the following steps.
1. Check the on-off of wires
First remove the terminals on both sides of the control computer ECU and the sensor, and then measure the resistance between the corresponding terminals of the terminals. If the resistance is not more than 1 ohm, the wire is OK for the next inspection. When measuring the resistance of the wire, it is best to gently shake the wire in both vertical and horizontal directions to improve the accuracy of the measurement. At the same time, note that most wire terminals and multimeter meters should be inserted from the rear end of the connector, but for waterproof terminals equipped with waterproof sleeves, the meter cannot be inserted from the rear end, because the terminals will be deformed if they are not carefully inserted.
2. Check the resistance value of short circuit
First remove the wire terminals on both sides of the control computer ECU and the sensor, and then measure the resistance value between the terminal blocks of the connectors on both sides and the body. When measuring, one end of the meter bar is grounded to the body, and the other end is measured on the wire connectors on both sides. If the resistance value is greater than 1 ohm, it means that there is no short circuit fault between the wire and the body.
3. Inspection of terminal appearance and contact pressure
First of all, remove each terminal one by one, check whether there is rust or dirt on the connector terminal, and clean up the rust and dirt. Then check whether the terminal piece is loose or damaged, whether the terminal is fixed firmly, and the terminal shall not be loose when gently pulled. On the contrary, if the plug terminal in which one of the housing holes is pulled out more easily than the other housing holes, the housing hole may cause a malfunction of poor contact in use.
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The function of the wiring terminal is well stated. The wiring terminal is actually a kind of connector. It is used to facilitate the connection of wires. It is actually a piece of metal sealed in insulating plastic. There are holes at both ends to insert wires. Screws are used to tighten or loosen, such as two wires, sometimes need to be connected, sometimes need to be disconnected, then they can be connected with terminals and disconnected at any time, without having to weld them or wrap them together, it's easy and quick.
Common faults and problems of terminals
From the perspective of use, the function that the terminal should achieve is that the contact part must be conducted and the contact is reliable. Insulated parts that should not be conducted must be insulated reliably.
How to Preventive Screening Check
In order to ensure the quality and reliability of the terminal and prevent the occurrence of the above-mentioned faults, it is recommended to study and formulate the corresponding screening technical requirements according to the technical conditions of the product, and carry out the following targeted reliability inspection for failure prevention.
What are the concepts of "connector", "connector" and "terminal?
Connectors, also known as connectors, plugs and sockets in China, generally refer to electrical connectors, that is, devices that connect two active devices to transmit current or signals (electrical signals or optical signals). Its function is very simple: it is blocked in the circuit. Or between isolated and disconnected circuits, a bridge of communication is built, so that current flows and the circuit realizes the intended function.
Is there any subordinate relationship among "connector", "connector" and "terminal?
Connectors and connectors are the first category, is a general term, the difference is that the connector is the connection of the line and the line, the connector is the connection of the line and the board and the box, in life often fuzzy to the two refers to the same type of products, and terminals belong to this category of products in a type.
How are "connectors", "connectors" and "terminals" applied?
Connectors are mainly used in the connection between circuits and circuits. They are the core basic components necessary for the electrical connection of the circuit system. The main application areas of connectors are smart homes, automobiles, communications, computers and peripherals, industry, military and aerospace. The scope of application will become wider and wider, and they are basically used in various industries.
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