4000636 F 267模块备件

4000636 F 267

配置
177页图61和178页图62给出了一系列简单电路
显示连接输入电源的各种可能性的图表-
通过电源断路器、电源装置和SS83X投票装置–连接至
24伏直流配电终端。
AC 800M控制器及其I/O系统通常位于一个或多个位置
外壳或机柜。安装AC 800M控制器的机柜也可以：
包含通过电气模块总线连接到控制器的I/O单元
光纤模块总线或PROFIBUS DP的通信接口。
包含AC 800M控制器的机柜
该机柜可能需要以下电源：
•电源装置：为机柜中每个装置的电子电路供电。
•为现场设备供电：为设备、继电器触点等供电
在机柜外部，但连接到机柜中I/O单元的输入/输出
内阁
包含I/O系统的机柜
如果I/O中未提供其他信息，请使用上述建议
系统文档。
强烈建议：
•在每个机柜中使用电源为单元供电（仅当机柜
并且大电缆长度小于10m，
装置的电源是否可以从另一个机柜获取
•使用单独的电源为装置供电（包括S800集群
调制解调器）和为现场设备供电
机柜3节配置中的供电装置
174 3BSE036351-510 A
为机柜中的单元供电
该电源仅连接到机柜内的单元，例如：
•PM8XX，也为所有通信接口供电（通过CEX总线）
以及连接到其电气模块总线的所有S800 I/O单元。
•BC810为连接到其自身网段的所有通信接口供电。
•TB820V2/TB840（用于S800 I/O的光调制解调器），也为所有S800供电
连接到其电气模块总线的I/O单元。
•CI840和CI801（用于S800 I/O的PROFIBUS DP接口），也为其供电
所有连接到其电气模块总线的S800 I/O单元。
•用于其他I/O系统的PROFIBUS DP适配器（取决于电源）
对于I/O单元的布置，可能需要将电源连接到每个I/O
单位）。
•机柜中的通信调制解调器。
该电源的主要配置规则是将24 V电缆保持在
内阁。
为机柜外的现场设备供电
其目的是为处理信号和定位的设备供电
在柜子外面。
干扰
通过AC 800M控制器中的电源为现场设备供电
机柜通常需要使用长的24 V直流电缆，可以轻松拾取本地数据
并将其直接引回到电源装置。当安装时
电缆，遵循62页电缆下的现场电缆说明。
电源输出短路
SD83X系列电源在其输出端没有额外的储能器。在
如果发生短路，电源输出电压将迅速下降。
短路（即使在24 V直流配电系统中安装了保险丝）或过大
负载变化可能会在电源中产生不必要的电压骤降。
3节机柜外现场设备的配置和供电
3BSE036351-510 A 175
为了避免AC 800M控制器受到现场设备的影响，强烈建议：
建议安装单独的电源（参见147页的图50）
148页图51）。
分段现场设备
如果连接至AC 800M控制器的现场设备将被分为：
组–从而避免一个组中的电源故障影响电源
其他组–然后建议为每个字段使用单独的电源
设备组。
在24 V直流配电系统中使用保险丝不是故障安全措施。如果是
一组中发生短路，则电压极有可能在保险丝前下降
打击；因此，所有组都将经历电压下降。
电缆保护
24 V直流配电系统电缆必须采用保险丝保护。为了允许
在过载/短路情况下，电源输出电流受到限制。允许
电源的额外容量至少为电源额定电流值的3-4倍
大连接保险丝，请记住在保险丝中包含长电缆电阻
计算
连接替代方案
现场设备电源的连接方式与使用的方式相同
用于连接交流800M装置并为其供电（参见177页的图61和
178页图62）。然而，应注意的是，相同的电源断路器
该装置可用于控制和隔离两个电源。或者，
每个支线上可以使用独立的电源断路器（参见pa图62）

4000636 F 267

4000636 F 267

Configurations Figure 61 on page 177 and Figure 62 on page 178 gives a series of simple circuit diagrams showing various possibilities for connecting the incoming mains power – via the mains breaker, the power supply units and the SS83X voting devices – to the 24 V DC distribution terminals. The AC 800M Controller and its I/O system are normally located in one or several enclosures or cabinets. The cabinet housing the AC 800M Controller can also contain I/O units connected to the controller via the electrical ModuleBus, the optical ModuleBus or the communication interfaces for PROFIBUS DP. Cabinet Containing AC 800M Controller From this cabinet power may be required for: • Powering Units: power to the electronic circuitry for each unit in the cabinet. • Powering Field Equipment: power to equipment, relay contacts etc. located outside the cabinet, but connected to the inputs/outputs of the I/O units in the cabinet. Cabinet Containing I/O System Use the recommendations given above if no other information is given in the I/O system documentation. It is strongly recommended to: • use a power supply in each cabinet for Powering Units (only when cabinets are mounted side by side, and the maximum cable length is less than 10 m, can power to the units be taken from another cabinet) • use separate power supplies for Powering Units (including S800 cluster modems) and Powering Field Equipment Powering Units in the Cabinet Section 3 Configuration 174 3BSE036351-510 A Powering Units in the Cabinet This power supply is only connected to units within the cabinet such as: • PM8XX, which also powers all communication interfaces (via the CEX-Bus) and all S800 I/O units connected to its electrical ModuleBus. • BC810 powers all communication interfaces connected to its own segment. • TB820V2/TB840 (optical modem for S800 I/O) which also powers all S800 I/O units connected to its electrical ModuleBus. • CI840 and CI801 (PROFIBUS DP interface for S800 I/O) which also powers all S800 I/O units connected to its electrical ModuleBus. • PROFIBUS DP adapters for other I/O systems (depending on the supply arrangement for the I/O units, it may be necessary to connect power to each I/O unit). • Communication modems located in the cabinet. The main configuration rule for this power supply is to retain the 24 V cables within the cabinet. Powering Field Equipment outside the Cabinet This is intended for supplying power to process signals and equipment located outside the cabinet. Interference Powering field equipment from a power supply located in the AC 800M Controller cabinet often requires the use of long 24 V DC cables that can easily pick up local interference and direct it straight back to the power supply units. When installing the cables, follow the instructions for Field Cables, given under Cables on page 62. Short-Circuit at Power Supply Output The SD83X series power supply has no extra energy reservoir at its outputs. In the event of a short circuit the power supply output voltage will fall rapidly. Short circuits (even with fuses installed in the 24 V DC distribution system) or large load changes can produce unwanted voltage dips in supply. Section 3 Configuration Powering Field Equipment outside the Cabinet 3BSE036351-510 A 175 To avoid the AC 800M Controller being influenced by field equipment, it is strongly recommended that separate power supplies be installed (see Figure 50 on page 147 and Figure 51 on page 148). Sectioning Field Equipment If field equipment connected to an AC 800M Controller is to be sectioned into groups – thus avoiding a power failure in one group from influencing the power to other groups – then it is recommended to use separate power supplies for each field equipment group. The use of fuses in the 24 V DC distribution system is not a fail-safe measure. If a short circuit occurs in one group, then voltage will most likely drop before a fuse blows; consequently all groups will experience a drop in voltage. Cable Protection 24 V DC distribution system cables must be fuse-protected. In order to allow for overload/short circuit situations, the power supply output current is limited. Allow the power supply an extra capacity of at least 3-4 times the rated current value of the largest connected fuse and remember to include long cable resistance in the calculation. Connection Alternatives The field equipment power supply can be connected in the same manner as that used for connecting and powering the AC 800M units (see Figure 61 on page 177 and Figure 62 on page 178). However, it should be noted that the same Mains Breaker Unit can be used to control and isolate both power supplies. Alternatively, independent Mains Breakers can be used on each spur (see Figure 62 on pa