DSDO115 工业备件
作面板接地
安装提示当在嘈杂环境中遇到通信问题或在接近温度限制的情况下运行时，应注意以下建议。操作面板接地 其他安装提示44 操作面板1接地。操作面板的安装夹无法在面板和设备机柜之间提供可靠的接地连接。2.在操作面板的快速连接底座和面板底盘之间连接一根2.5 mm2的电线。3.在面板底盘和车门上最近的接地点之间连接6或4 mm2电线或接地编织物。4.在门和设备机柜之间连接一个牢固但短的接地编织物。5.将电缆拧到24 V DC馈线上。门操作面板铁氧体磁芯机柜电源24 V DC第7节额外安装提示面板 45 6中的以太网连接。铁氧体铁芯可抑制对24 V馈电的干扰。围绕铁氧体磁芯的2匝提供了1匝的4倍抑制。围绕铁氧体磁芯的3匝提供了1匝的9倍抑制。
面板1中的以太网连接。在一些以太网工业设备中，RJ45触点的屏蔽通过电容器连接到机箱。接地线应短，导线应具有大面积。一根细长的接地线在高频下具有很高的阻抗（电阻），不会将干扰引导到地面。同一面积的多线导体优于单线导体。同样面积的编织导线更好。最好是一个短而厚的接地编织物。工业以太网RJ45 RJ45 NJ45 RJ-45 RJ45RJ45操作员面板操作员面板操作面板屏蔽短且无屏蔽0.1 uF 250 V实现更好的EMC保护第7节其他安装提示46 2。操作员面板的以太网屏蔽直接连接到机箱。检查另一个以太网单元的屏蔽是否直接接地或通过电容器接地。在许多情况下，在两端将屏蔽以太网电缆连接到机箱是不合适的。可能会出现嗡嗡声或接地回路。非屏蔽布线甚至可能导致更少的通信错误。一个好的解决方案可能是使用屏蔽以太网电缆，但只在一端连接屏蔽。3.一种选择是打破屏蔽。4.更优雅的方法是用一根非屏蔽以太网电缆扩展屏蔽以太网电缆。5.您可以通过外部0.1 uF/250 V塑料电容器将屏蔽接地。这将把高频瞬态连接到地上。要实现更好的EMC保护，请首先使用供应商提供的原始布线。使用屏蔽电缆进行RS232通信。RS422和RS485使用双绞线和屏蔽电缆。使用总线类型的电缆；以太网、Profibus、CC-Link、CAN、Device Net等。根据相关总线标准的适用规范进行安装和连接。以太网使用屏蔽电缆，最好使用箔+编织屏蔽。D-sub盖应进行屏蔽，并且屏蔽应与电缆引入处的盖360°连接。第7节实现更好EMC保护的其他安装提示 47连接两端的屏蔽。距离越长，接地电位可能会不同。在这种情况下，屏蔽应仅在一端连接。一个好的替代方案是通过0.1 uF/250 V塑料电容器将屏蔽的另一端连接到地。然后，两端以HF方式接地，但仅以LF方式在一端接地，从而避免了50 Hz的接地回路。
Make panel grounding
Installation tips When encountering communication problems in noisy environments or operating near temperature limits, the following recommendations should be noted. Grounding of operation panel Other installation tips 44 Grounding of operation panel 1. The installation clip of the operation panel cannot provide a reliable grounding connection between the panel and the equipment cabinet. 2. Connect a 2.5 mm2 wire between the quick connection base of the operation panel and the panel chassis. 3. Connect 6 or 4 mm2 wires or grounding braids between the panel chassis and the nearest grounding point on the door. 4. Connect a firm but short grounding braid between the door and the equipment cabinet. 5. Screw the cable onto the 24 V DC feeder. Door operation panel Ferrite core cabinet power supply 24 V DC Section 7 Additional installation prompts Ethernet connection in panel 45 6. Ferrite cores suppress interference with the 24 V feed. Two turns around the ferrite core provide four times the inhibition of one turn. Three turns around the ferrite core provide nine times the suppression of one turn.
Ethernet connection in panel 1. In some Ethernet industrial equipment, the shielding of RJ45 contacts is connected to the chassis through capacitors. The grounding wire shall be short and the conductor shall have a large area. A long and thin grounding wire has a high impedance (resistance) at high frequencies and will not lead interference to the ground. Multi wire conductors of the same area are superior to single wire conductors. Braided wires of the same area are better. A short and thick grounding braid is preferred. Industrial Ethernet RJ45 RJ45 NJ45 RJ-45 RJ-45 RJ45RJ45 operator panel operator panel operation panel shield short and unshielded 0.1 uF 250 V for better EMC protection Section 7 Other installation tips 46 2. The Ethernet shield of the operator panel is directly connected to the chassis. Check whether the shield of another Ethernet unit is grounded directly or through a capacitor. In many cases, it is not appropriate to connect shielded Ethernet cables to the chassis at both ends. A buzz or a ground loop may occur. Unshielded cabling may even result in fewer communication errors. A good solution might be to use a shielded Ethernet cable, but connect the shield only at one end. 3. One option is to break the shielding. 4. A more elegant method is to extend the shielded Ethernet cable with an unshielded Ethernet cable. 5. You can ground the shield through an external 0.1 uF/250 V plastic capacitor. This will connect the high frequency transient to ground. For better EMC protection, use the original cabling provided by the vendor first. Use shielded cable for RS232 communication. RS422 and RS485 use twisted pair and shielded cable. Use bus type cables; Ethernet, Profibus, CC Link, CAN, Device Net, etc. Install and connect according to applicable specifications of relevant bus standards. Ethernet uses shielded cable, preferably foil+braided shield. The D-sub cover shall be shielded and the shield shall be connected 360 ° to the cover at the cable entry. Section 7 Other installation tips for better EMC protection 47 Shielding at both ends of the connection. The longer the distance, the different ground potentials may occur. In this case, the shield should be connected at one end only. A good alternative is to connect the other end of the shield to ground through a 0.1 uF/250 V plastic capacitor. The two ends are then grounded in HF mode, but only in LF mode at one end, thus avoiding a 50 Hz grounding loop.
