产品内容介绍
CUTLER HAMMER DH664UDKW3控制器
终端组件一般说明现场I/O信号通过DIN导轨安装终端组件（TA）连接至FBM子系统。FBM可提供多种类型的TA，以提供I/O信号连接、信号调节、信号浪涌光学隔离、外部电源连接和/或熔断，以保护FBM和/或特定FBM所需的现场设备。由于这些功能内置在终端组件中（如需要），在大多数应用中，不需要额外的终端设备来实现现场电路功能，例如电路保护或信号调节（包括熔断和配电）。DIN导轨安装终端组件通过可拆卸终端电缆连接至FBM子系统基板。电缆有多种长度，最长30米（98英尺），允许终端组件安装在外壳或相邻外壳中。有关终端电缆零件号和规格，请参阅第7页的“功能规格-终端组件”。离散输出端接组件具有离散输出，支持16个2线离散输出信号，无源低电压小于60 V dc，有源高电压水平为120 V ac或240 V ac。有源端接组件支持FBM的输出信号调节。为了调节信号，这些终端组件提供保险丝保护、继电器、固态设备和接线板，以连接外部提供的可选配电
低压离散输出
低压输出（小于60 V dc）使用无源终端组件。这些组件有带和不带输出保护（熔断）。带保护的终端组件具有单独的用户可维修保险丝，其设计用于将输出电流限制在2 A。16个垂直安装，每个通道一个，3.15 A充砂保险丝（温度降低）允许每个输出通道的最大电流为2 A。不带熔断器（无保护）的终端组件供Foxboro®工程师或在终端组件和现场设备之间使用插入式继电器或熔断器接线板的客户使用。低压输出的电源可由FBM+24 V dc辅助电源（内部（FBM）供电）或现场电压源（外部供电）供电。高压离散输出高压输出（120 V ac或240 V ac）终端组件使用插入式SPDT（C型）机电继电器和固态开关。插入式插座允许现场更换各个继电器。继电器和相关插座位于终端组件的部件盖下面。终端组件的开关输出使用非密封通用继电器。这些组件能够提供混合电压，并通过将低压输入端定位在端子组件与输出端的相对侧，提供信号隔离。固态输出模块是可选的。高压离散输出始终为外部电源。
TERMINATION ASSEMBLIES
General Description Field I/O signals connect to the FBM subsystem via DIN rail mounted termination assemblies (TAs). Multiple types of TAs are available with FBMs to provide I/O signal connections, signal conditioning, optical isolation from signal surges, external power connections, and/or fusing for protection of the FBM and/or field device as required by the particular FBM. Since these features are built into the termination assemblies (where required), in most applications there is no need for additional termination equipment for field circuit functions such as circuit protection or signal conditioning (including fusing and power distribution). The DIN rail mounted termination assemblies connect to the FBM subsystem baseplate by means of removable termination cables. The cables are available in a variety of lengths, up to 30 meters (98 feet), allowing the termination assemblies to be mounted in either the enclosure or in an adjacent enclosure. Refer to “FUNCTIONAL SPECIFICATIONS - TERMINATION ASSEMBLIES” on page 7 for termination cable part numbers and specifications. Discrete Outputs Termination assemblies with discrete outputs support sixteen 2-wire discrete output signals at passive low voltages of less than 60 V dc and active high voltage levels of 120 V ac or 240 V ac. Active termination assemblies support output signal conditioning for FBMs. To condition signals, these termination assemblies provide fuse protection, relays, solid-state devices, and terminal blocks to connect externally supplied optional power distribution
Low Voltage Discrete Outputs
The low voltage outputs (less than 60 V dc) use passive termination assemblies. These assemblies are available with and without output protection (fusing). Termination assemblies with protection have individual user serviceable fuses that are designed to limit the output current to 2 A. Sixteen vertically mounted, one per channel, 3.15 A sand filled fuses (temperature derated) allow a maximum of 2 A current per output channel. Termination assemblies without fusing (unprotected) are intended for use by Foxboro® engineers or customers who are using interposing relays or fuse terminal blocks between the termination assembly and the field devices. Power for the low voltage outputs can be supplied by the FBM +24 V dc auxiliary power supply (internally (FBM) sourced) or by a field voltage source (externally sourced). High Voltage Discrete Outputs The high voltage output (120 V ac or 240 V ac) termination assemblies use plug-in SPDT (Form C) electromechanical relays and solid-state switches. The plug-in sockets allow field replacement of individual relays. The relays and associated sockets are located under the component covers of the termination assemblies.The termination assembly’s switched outputs use unsealed, general purpose relays.These assemblies are capable of providing mixed voltage and are designed to provide signal segregation by locating the low voltage inputs an the opposite side of the terminal assembly from the outputs. A solid-state output module is optionally available. High voltage discrete outputs are always externally sourced power.
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