HIMA F3406a备件模块
是否图49：电源输入端子的正确接线规程▪ 对于IC694电源，每个端子接受一根AWG#14（2.1mm2）或两根AWG#16（1.3mm2）75°C（167°F）铜线。电源端子的建议扭矩为1.36 Nm（12 in-lb）。每个端子都可以接受实心或绞合导线。同一端子中的多条电线应具有相同的类型（实心或绞合）和尺寸。图50：I/O模块+/L1-/N/L2跳线接地的IC695电源端子24VDC输出图51：IC694电源端子§仅用于扩展（IC694）电源，底部端子可访问扩展背板的隔离+24V DC输出，该输出可用于为某些IC694模块的输入电路供电。有关信息，请参阅第4.2节模块负载要求表。PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装66注意事项如果隔离24Vdc电源过载或短路，PLC将停止运行。PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装67 2.6.6.2交流电源连接将火线和中性线或L1和L2连接到适当的电源端子。2.6.6.3直流电源连接所有RX3i电源都具有直流输入功能。将直流电源的+和-导线连接到适当的端子。这些连接是极性敏感的直流电源。2.6.6.3.1接地连接将安全接地线连接到标有接地符号的端子。2.6.6.4外部过电压保护电源模块上的接地和MOV端子通常通过用户安装的跳线连接到机架接地（如图52所示）。如果不需要过电压保护或在上游提供过电压保护，则不需要跳线。在具有浮动中性输入的系统中（中性线未参考保护接地），不得安装此跳线。此外，在浮动中性点系统中，电压浪涌保护装置（如MOV）必须从L1安装到接地，从L2（中性点）安装到接地线。+/L1-/N/L2跳线带将过电压保护装置连接至机架接地机架接地螺钉端子图52：外部过电压保护2.6.6.5浮动中性点（IT）系统的交流电源连接如果在中性线未参考保护接地的系统中安装交流输入电源，必须遵循特殊的安装说明，以防止损坏电源。浮动中性点系统是一种配电布线系统，其中中性点和保护接地不通过可忽略的阻抗连接在一起。在欧洲，这被称为IT系统（参考IEC950）。在浮动中性点系统中，从输入端子到保护接地测量的电压可能超过264Vac最大输入电压电源规格。L1 N PE图53：浮动中性点PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装68 2.6.6.6非浮动中性点系统系统的交流电源连接，其中配电线路的一条腿连接到保护接地，或配电线路的两条腿之间的抽头连接到保护地。非浮动中性系统。非浮动中性系统不需要特殊的安装程序。图54：中性点不浮动（接地）2.6.6.7浮动中性点系统说明1。输入电源端子的接线应如上图49至图51所示。2.不得在电源模块的端子3和4之间安装跳线。3.必须安装电压浪涌保护装置，如MOV：▪ 从L1到接地▪ 从L2（中性点）到接地电压浪涌装置的额定值必须确保系统免受超过线路电压+100 Vac+（N-PE）MAX的电力线瞬变的影响。N-PE表示中性点和保护接地（PE）之间的电压电势。例如，在中性点浮动的240伏交流系统中
Yes No Figure 49: Correct Wiring Practice for Power Supply Input Terminals ▪ For IC694 Power Supplies, each terminal accepts one AWG #14 (2.1mm2 ) or two AWG #16 (1.3mm2 ) copper 75°C (167°F) wires. The suggested torque for the Power Supply terminals is 1.36 Nm (12 in-lb). Each terminal can accept solid or stranded wires. Multiple wires in the same terminal should be of the same type (solid or stranded) and size. Figure 50: IC695 Power Supply Terminals 24VDC Output for I/O Modules + / L1 - / N / L2 Jumper Ground Figure 51: IC694 Power Supply Terminals § For Expansion (IC694) Power Supplies only, the bottom terminals provide access to the Isolated +24Vdc output of the Expansion Backplane, which can be used to power input circuits for certain IC694 modules. Refer to the table Module Load Requirements, Section 4.2 for information. PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 66 CAUTION If the Isolated 24Vdc supply is overloaded or shorted, the PLC will stop operation. PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 67 2.6.6.2 AC Power Source Connections Connect the hot and neutral wires or lines L1 and L2 to the appropriate Power Supply terminals. 2.6.6.3 DC Power Source Connections All RX3i Power Supplies have DC input capabilities. Connect the + and - wires from the DC source to the appropriate terminals. These connections are polarity-sensitive DC-only supplies. 2.6.6.3.1 Ground Connection Connect the safety ground wire to the terminal marked with a ground symbol. 2.6.6.4 External Overvoltage Protection The Ground and MOV terminals on a Power Supply module are normally connected to frame ground with a user-installed jumper (as shown in Figure 52). If overvoltage protection is not required or is supplied upstream, no jumper is needed. In systems with a floating neutral input (the neutral line is not referenced to Protective Earth Ground), this jumper must NOT be installed. In addition, in a floating neutral system, voltage surge protection devices such as MOVs must be installed from L1 to earth ground, and from L2 (Neutral) to earth ground. + / L1 - / N / L2 Jumper strap connects overvoltage protection devices to frame ground Frame Ground Screw Terminals Figure 52: External Overvoltage Protection 2.6.6.5 AC Power Supply Connections for Floating Neutral (IT) Systems If an AC input power supply is installed in a system where the Neutral line is not referenced to Protective Earth Ground, special installation instructions must be followed to prevent damage to the power supply. A Floating Neutral System is a system of power distribution wiring where Neutral and Protective Earth Ground are not tied together by negligible impedance. In Europe, this is referred to as an IT system (refer to IEC950). In a Floating Neutral System, voltages measured from input terminals to protective earth ground may exceed the 264Vac maximum input voltage power supply specification. L1 N PE Figure 53: Floating Neutral PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 68 2.6.6.6 AC Power Supply Connections for Non-Floating Neutral System Systems where one leg of the power distribution wiring is tied to Protective Earth or a tap between two legs of the power distribution wiring is tied to Protective Earth are not Floating Neutral Systems. Non-floating neutral systems do not require special installation procedures. Figure 54: Neutral Not Floating (Tied to Ground) 2.6.6.7 Instructions for Floating Neutral Systems 1. The input power terminals should be wired as shown in Figure 49 through Figure 51 above. 2. No jumper may be installed jumper between terminals 3 and 4 of the Power Supply module. 3. Voltage surge protection devices such as MOVs must be installed: ▪ From L1 to earth ground ▪ From L2 (Neutral) to earth ground The voltage surge devices must be rated such that the system is protected from power line transients that exceed Line voltage + 100 Vac + (N-PE)MAX. The expression N-PE refers to the voltage potential between neutral and Protective Earth (PE) ground. For example, in a 240 Volt AC system with neutral floating
