DJYPVP armored computer cable is a shielded armored cable designed specifically for signal transmission in industrial automation and precision instrument equipment. Its core function is to achieve high-precision and low interference signal transmission between computer systems, control systems, and detection equipment in complex electromagnetic environments and harsh working conditions. Widely used in fields such as metallurgy, chemical engineering, power, mining, and rail transit that require extremely high reliability in signal transmission.
Selection and installation precautions
1. Key selection points
-Select the number of cores and cross-section according to transmission requirements: Determine the number of cable cores based on the number of sensors and actuators in the control system, ensuring that a certain number of spare cores are reserved (usually 1-2 cores are reserved); Select the conductor cross-section based on the transmission distance and signal type. The longer the transmission distance and the weaker the signal, the larger the cross-section of the conductor should be chosen to reduce signal attenuation.
-Choose the type of armor based on the installation environment: for direct burial, cable trench installation, and when there is no tension requirement, choose steel tape armor (DJYPVP22); When laying vertical shafts, bridges, or when subjected to tension, choose steel wire armor (DJYPVP32); When laying indoor cable trays without the risk of mechanical damage, the unarmored model (DJYPVP) can be selected, but it is recommended to prioritize the armored model in industrial environments.
-Select materials based on ambient temperature: If the working environment temperature exceeds 90 ℃, it is necessary to communicate with the manufacturer to customize high-temperature resistant insulation materials; If the ambient temperature is below -40 ℃, a low-temperature weather resistant sheath and armor material should be selected.
-Confirm shielding performance based on interference intensity: In strong electromagnetic interference environments (such as near frequency converters and high-voltage equipment), it is necessary to confirm that the weaving density of the shielding layer is ≥ 90%, and if necessary, choose a composite protective structure of double-layer shielding and armor.
2. Installation precautions
-Pre laying inspection: Before laying, it is necessary to check whether the appearance of the cable is intact, whether there are any damage or compression marks; Use a shaking table to test the insulation resistance and ensure that the insulation performance is qualified (insulation resistance ≥ 100M Ω· km).
-Avoid excessive bending: During the laying process, the bending radius must be strictly controlled and not less than the specified value (steel tape armor ≥ 12 times the outer diameter of the cable, steel wire armor ≥ 15 times the outer diameter of the cable) to avoid damaging the conductor, insulation, and shielding layer.
-Shielding layer grounding specification: The shielding layer should be grounded at one end or two ends, depending on the type of interference: single end grounding is used to suppress electric field interference, and double end grounding is used to suppress magnetic field interference; The grounding resistance should be less than 4 Ω, and the cross-sectional area of the grounding wire should not be less than 2.5mm ².
-Stay away from strong interference sources: When laying cables, they should be kept away from strong electromagnetic interference sources such as high-voltage cables, frequency converters, and motors. The parallel laying distance between the two should not be less than 0.5m, and when crossing, they should be laid vertically to avoid long-distance parallel laying.
-Direct burial protection: During direct burial, the cable should be laid in yellow sand or fine soil, covered with warning tape to avoid direct contact with sharp objects; When crossing highways and railways, protective pipes (such as steel pipes and PE pipes) need to be installed to enhance protection.
-Joint processing: Cable joints should use dedicated junction boxes to ensure sealing, moisture resistance, and reliable insulation; The shielding layer should be continuously connected at the joint without interruption to ensure the integrity of the shielding circuit.
-Regular maintenance: Regularly check the appearance, insulation resistance, and grounding of the cable during use. If any damage, aging, or poor grounding is found, repair or replace it in a timely manner to avoid signal transmission failures.