HIEE300690R0001 DCS工控模块备件
DL930系列90-30混合I/O 8点24Vdc输入/8点Re外壳表面必须与相邻表面充分接地，以提供导电性。▪ 外壳外部的布线必须在金属导管或等效物中布线。使用屏蔽电缆和电力线过滤，如“屏蔽电缆替代导管”一节所述，等同于使用金属导管。▪ 必须使用标准程序和硬件将导管安装到外壳上，以确保外壳和导管之间的导电性。屏蔽电缆替代导管的终端在“屏蔽电缆替代导线管”一节中详细说明。屏蔽电缆替代导管本节描述了使用屏蔽电缆替代金属导管以满足辐射排放要求（EN 55011、47CFR15等）的安装要求。对于需要导管或等效物的系统或电缆，可使用以下做法代替导管。17.2.3.1.10通信电缆所有通信线路应为双屏蔽。外部编织屏蔽（85%覆盖率）必须终止于外壳入口，不得在外壳内继续。内部屏蔽应保持完整，因为它保护通信线路免受外壳内噪声的影响，并终止于连接器外壳。RX3i通信端口连接器外壳直接连接到机架接地。为了防止接地回路电流，内部屏蔽的一个电缆端应与外壳电容耦合。外部屏蔽被分类为射频屏蔽，应与内部屏蔽绝缘。PACSystems*RX3i系统手册附录GFK-2314T 2019年9月产品认证和符合性安装指南862 Genius总线通信双屏蔽电缆的替代品是Eupen*CMS电缆，等同于Genius电缆，外壳入口具有射频吸收功能。该85%射频屏蔽不应继续进入外壳。百分之八十五的编织屏蔽是一种标准电缆，可从许多电缆制造商处获得各种电线尺寸和数量。17.2.3.112模拟/高速电缆模拟或高速线路需要屏蔽电缆以抗干扰，应采用双屏蔽。外部编织屏蔽应终止于外壳入口，不得在外壳内继续。内部屏蔽应按照标准安装说明进行端接。外部屏蔽被分类为射频屏蔽，应与内部屏蔽绝缘。17.2.3.13外壳电源输入（用于IC694电源）屏蔽输入电缆的另一种选择是使用RF滤波器，以最小化耦合回电源输入的噪声。如果在外壳入口点使用RF滤波器，则外壳内外可使用非屏蔽电线。交流电源输入RF
DL930 Series 90-30 Mixed I/O 8-point 24Vdc In / 8-point Re urfaces of the enclosure must be adequately grounded to adjacent surfaces to provide electrical conductivity. ▪ Wiring external to the enclosure must be routed in metal conduit or the equivalent. Using shielded cables and power line filtering, as detailed in the section, Shielded Cable Alternative to Conduit, is equivalent to using metal conduit. ▪ The conduit must be mounted to the enclosure using standard procedures and hardware to ensure electrical conductivity between the enclosure and conduit. The termination for the shielded cable alternative to conduit is detailed in the section, Shielded Cable Alternative to Conduit. Shielded Cable Alternative to Conduit This section describes the installation requirements for using shielded cable as an alternative to metal conduit for meeting radiated emissions requirements (EN 55011, 47CFR15, and such). The following practices could be used in place of conduit for systems or cables that require conduit or the equivalent. 17.2.3.1.10 Communication Cables All communication lines should be double-shielded. The outside braided shield (85% coverage) must be terminated at the entrance to the enclosure and not continue within the enclosure. The inside shield should be left intact since it shields the communication line from noise within the enclosure and is terminated to the connector shell. The RX3i communication port connector shells are directly tied to frame ground. To prevent ground loop currents, one cable end of the inside shield should be capacitively-coupled to its shell. The outside shield is classified as an RF shield and should be insulated from the inside shield. PACSystems* RX3i System Manual Appendix GFK-2314T Sept. 2019 Product Certifications and Installation Guidelines for Conformance 862 An alternative to double-shielded cable for Genius bus communications is Eupen* CMS cable, equivalent Genius cables with an RF-absorptive the entrance to the enclosure. This 85% RF shield should not continue into the enclosure. Eighty-five percent braided shield is a standard cable available with various wire sizes and quantities from many cable manufacturers. 17.2.3.1.12 Analog/High-Speed Cables Analog or high-speed lines, which require shielded cable for immunity, should be double-shielded. The outside braided shield should be terminated at the entrance to the enclosure and not continue within the enclosure. The inside shield should be terminated per standard installation instructions. The outside shield is classified as an RF shield and should be insulated from the inside shield. 17.2.3.1.13 Power Input to Enclosure (for IC694 Power Supplies) An alternative to shielded input cables is to use RF filters to minimize the noise coupled back onto the power supply inputs. If RF filters are used at the point of enclosure entry, unshielded wires may be used inside and outside the enclosure. AC Power Input RF
