If all the wiring is divided, it should be divided into power wiring, control wiring, and communication wiring. Power line refers to the line that provides power and transmits large current, usually 380V or even higher, and the control line refers to the line of the control loop, usually 24V or 220V. The communication line refers to the line used for communication, for example Profibus communication cable, PLC and touch screen communication line, etc. As far as the actual situation is concerned, the power line will be installed and wired by a special power workshop. We will rarely touch it, and most of the control lines will be wired by the specialized panel manufacturer. As for the specification of the wiring. It is completely determined by the design wiring diagram. We may touch the communication line a little more. We may make a DP plug or make other communication lines. In short, from the perspective of contact range, we may be involved in wiring diagram design, control wiring, and communication wiring.
First, the wiring diagram design:
The page order is generally as follows: main circuit wiring → control line wiring → terminal wiring
(1) When different control boxes are connected through terminals (ie other control boxes, control boards or components not in the control box or control board enter the control box or control board, you must first receive the control box or control board) On the terminal, then the terminal lead).
(2) The same terminal wiring is not allowed to exceed two.
(3) The high voltage and power lines use R-shaped terminals, and the signal lines use Y-shaped terminals.
(4) Components can be represented by simple square or circular patterns, but the terminal positions are as close as possible to the actual component positions.
(5) Wiring diagram The placement of components should be the same or similar to the layout of the layout. For a component, the location of the marked terminal must be the same as the actual component of the layout.
(6) Force the beauty of the entire picture. Therefore, when drawing the connection diagram, keep the whole picture compact and clear. At the same time, try not to make the picture too thin. Try to avoid the intersection of the connecting lines. Try to use straight lines for the connecting lines. The distance between the connecting lines and the components should be as equal as possible.
Second, control wiring
Generally, the control circuit wiring is carried out according to the design drawings. The connection of the control wiring (including bolt connection, plugging, welding, etc.) should be firm and reliable. The wiring harness should be horizontal and vertical, and the same component should be the same in the same contract. This will be layered and neat.
Precautions:
(1) It is best not to have a joint in the middle of all connecting wires, and it is better not to connect two wires in each terminal connecting point.
(2) It is best to keep away from arcing components, and it is best not to affect the operation of the electrical equipment.
(3) Control wiring should not be interleaved with the power line overlap
Third, communication wiring
Communication wiring is mainly divided into the production of DP plugs and the wiring of some PLCs and touch screens and other communication equipment. If the wiring is not required, it may cause communication interruption, communication instability or communication failure.
Precautions:
(1) Correct wiring, for example, the connection between Siemens PLC and Kunlun open state touch screen is generally 38 corresponding to 78. If it is not wired as required, it will result in communication failure.
(2) The wiring is firm. If the wiring is not secure, the virtual connection may occur, which may result in communication interruption and instability.
(3) Pay attention to the treatment of shielding and grounding. Personally, it is very important to deal with the shielding layer. For example, when making a DP plug, the shielding tape must be accurately placed on the metal guiding device to ensure the stability of communication.
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