ICS TRIPLEX T3484模块备件,备件模块
能够驱动469差动CT负载（额定值见第1-4页第1.2节：规范）。差分CT可以是如下图所示的堆芯平衡。或者，差动输入中每相两个CT的总和将提供更大的保护区。如果使用两个CT的总和，则观察CT极性很重要。也可以使用如下所示的相位CT来实现求和方法。它们必须具有相同的CT比率。图2–14：铁芯平衡方法图2–15：无相CT和相CT的汇总方法GE Multilin 469电机管理继电器2-13 2安装2.2电气2 2.2.4电压输入469有三个交流电压输入通道，每个通道都有一个隔离变压器。电压输入上没有内部保险丝或接地连接。最大VT比率为150.00:1。两个VT连接为开放三角形（见图2-10：第2-8页的典型接线图）或Y形（见下文）。电压通道在内部以Y形连接，这意味着必须为开放式三角电压互感器安装B相输入和469中性端子之间的典型接线图三角电源连接上所示的跳线。VT的极性对于正确的功率测量和电压相位反转操作至关重要。通常使用1 A保险丝来保护输入。图2-16:WYE电压互感器连接2.2.5数字输入只有9个数字输入设计用于干触点连接。两个数字输入（访问和测试）具有自己的公共端子；数字输入的其余部分共用一个公共端子（见图2-10：第2-8页的典型接线图）。此外，+24 V DC开关电源用于感应式或电容式接近探头的控制电源。NPN晶体管输出可被带到配置为计数器或转速表的可分配数字输入之一。有关+24 V直流开关电源的最大电流消耗，请参阅第1–4页第1.2节：规范。不向数字输入注入电压。仅限干触点连接。警告2-14 469电机管理继电器GE Multilin 2.2电气2安装2 2.2.6模拟输入469为四个0至1mA、0至20mA或4至20mA电流输入信号（现场可编程）提供端子。该电流信号可用于监测外部量，如振动、压力或流量。四个输入共用一个公共回路。必须观察这些输入的极性，以便正确操作。模拟输入电路与模拟输出电路和RTD电路作为一组隔离。三个电路只能使用一个接地参考。相对于469安全接地，Transorbs将此隔离限制在±36 V。此外，+24V DC模拟输入电源用于回路供电传感器的控制电源。有关此电源的最大电流消耗，请参阅第1-4页第1.2节：规范。图2–17：回路供电传感器连接2.2.7模拟输出469提供4个模拟输出通道，可按要求提供0至1 mA（最大10 kΩ 阻抗）或4至20 mA（最大值为1200Ω 阻抗）。每个通道可配置为为任何测量参数的任何范围提供满量程输出灵敏度。如第2–8页图2–10：典型接线图所示，这些输出共用一个公共回路。必须观察这些输出的极性，以便正确操作。应使用屏蔽电缆，仅屏蔽一端接地，以尽量减少噪声影响。模拟输出电路与模拟输入电路和RTD电路隔离为一组。三个电路只能使用一个接地参考。相对于469安全接地，Transorbs将此隔离限制在±36 V。如果需要电压输出，则必须在SCADA测量装置的输入端连接负载电阻器。忽略输入的输入阻抗，Rload=V满量程/Imax。例如，对于0至1 mA，如果要求5 V满量程对应1 mA，则Rload=5 V/0.001 A=5000Ω. 对于4至20 mA，此电阻器
capable of driving the 469 differential CT burden (see Section 1.2: Specifications on page 1–4 for ratings). The differential CTs may be core balance as shown in the first figure below. Alternatively, the summation of two CTs per phase into the differential input will provide a larger zone of protection. If the summation of two CTs is used, observation of CT polarity is important. The summation method may also be implemented using the phase CTs as shown below. They will have to have the same CT ratio. Figure 2–14: CORE BALANCE METHOD Figure 2–15: SUMMATION METHOD WITHOUT PHASE CTs WITH PHASE CTs GE Multilin 469 Motor Management Relay 2-13 2 INSTALLATION 2.2 ELECTRICAL 2 2.2.4 VOLTAGE INPUTS The 469 has three channels for AC voltage inputs, each with an isolating transformer. There are no internal fuses or ground connections on the voltage inputs. The maximum VT ratio is 150.00:1. The two VT connections are open delta (see Figure 2–10: Typical Wiring Diagram on page 2–8) or wye (see below). The voltage channels are connected in wye internally, which means that the jumper shown on the delta-source connection of the TYPICAL WIRING DIAGRAM, between the phase B input and the 469 neutral terminal, must be installed for open delta VTs. Polarity of the VTs is critical for correct power measurement and voltage phase reversal operation. A 1 A fuse is typically used to protect the inputs. Figure 2–16: WYE VOLTAGE TRANSFORMER CONNECTION 2.2.5 DIGITAL INPUTS There are 9 digital inputs designed for dry contact connections only. Two of the digital inputs (Access and Test) have their own common terminal; the balance of the digital inputs share one common terminal (see Figure 2–10: Typical Wiring Diagram on page 2–8). In addition, the +24 V DC switch supply is brought out for control power of an inductive or capacitive proximity probe. The NPN transistor output could be taken to one of the assignable digital inputs configured as a counter or tachometer. Refer to Section 1.2: Specifications on page 1–4 for maximum current draw from the +24 V DC switch supply. DO NOT INJECT VOLTAGES TO DIGITAL INPUTS. DRY CONTACT CONNECTIONS ONLY. CAUTION 2-14 469 Motor Management Relay GE Multilin 2.2 ELECTRICAL 2 INSTALLATION 2 2.2.6 ANALOG INPUTS The 469 provides terminals for four 0 to 1mA, 0 to 20mA, or 4 to 20mA current input signals (field programmable). This current signal can be used to monitor external quantities such as vibration, pressure, or flow. The four inputs share one common return. Polarity of these inputs must be observed for proper operation The analog input circuitry is isolated as a group with the analog output circuitry and the RTD circuitry. Only one ground reference should be used for the three circuits. Transorbs limit this isolation to ±36 V with respect to the 469 safety ground. In addition, the +24 V DC analog input supply is brought out for control power of loop powered transducers. Refer to Section 1.2: Specifications on page 1–4 for maximum current draw from this supply. Figure 2–17: LOOP POWERED TRANSDUCER CONNECTION 2.2.7 ANALOG OUTPUTS The 469 provides 4 analog output channels which may be ordered to provide a full-scale range of either 0 to 1 mA (into a maximum 10 kΩ impedance) or 4 to 20 mA (into a maximum 1200 Ω impedance). Each channel can be configured to provide full-scale output sensitivity for any range of any measured parameter. As shown in Figure 2–10: Typical Wiring Diagram on page 2–8, these outputs share one common return. Polarity of these outputs must be observed for proper operation. Shielded cable should be used, with only one end of the shield grounded, to minimize noise effects. The analog output circuitry is isolated as a group with the Analog Input circuitry and the RTD circuitry. Only one ground reference should be used for the three circuits. Transorbs limit this isolation to ±36 V with respect to the 469 safety ground. If a voltage output is required, a burden resistor must be connected at the input of the SCADA measuring device. Ignoring the input impedance of the input, Rload = Vfull scale / Imax. For 0 to 1 mA, for example, if 5 V full scale is required to correspond to 1 mA, Rload = 5 V / 0.001 A = 5000 Ω. For 4 to 20 mA, this resistor
