83SR09E 83SR09D-E GJR2366500R1010 控制单元

83SR09E 83SR09D-E GJR2366500R1010 控制单元 

为了避免AC 800M控制器受到现场设备的影响
建议安装单独的电源（参见147页图50
148页图51）。
现场设备分段
如果连接到AC 800M控制器的现场设备将被分为：
组–从而避免一组中的电源故障影响
其他组–建议为每个现场使用单独的电源
设备组。
在24V直流配电系统中使用熔断器不是故障安全措施。如果
如果一组发生短路，则电压极有可能在保险丝之前下降
打击；因此，所有组都将经历电压下降。
电缆保护
24V直流配电系统电缆必须采用熔断器保护。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额定电流值的3-4倍
大连接保险丝，请记住在
计算
连接备选方案
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页图61和
178页图62）。但是，应注意，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，
每个支路上可使用独立的电源断路器（参见178页图62）。
从外部电源供电3节配置
176 3BSE036351-510 A
从外部电源供电
AC 800M控制器可由外部+24V直流电源供电。这
对于许多不同类型的工厂设备，源通常是常见的，导致
连接AC 800M控制器的长电源电缆。此外，重载变化可以
导致控制器电源电压变化，因此需要采取预防措施
以防止控制器故障。
如果PM8XX电源端子处存在+24 V电压下降的风险
低于19.2 V持续1 ms以上，则必须使用储能器
动力装置。
ABB要求在以下情况下使用DC/DC转换器和额外的储能器：
使用电缆长度超过10m的外部直流电源。
对于AC 800M控制器和相关单元的冗余电源，
始终从SS8xx投票设备导出连接。参见页的图61
177

83SR09E 83SR09D-E GJR2366500R1010 控制单元 

83SR09E 83SR09D-E GJR2366500R1010 控制单元 

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 page 178).
Powering from an External Source Section 3 Configuration
176 3BSE036351-510 A
Powering from an External Source
The AC 800M Controller can be powered from an external +24 V DC source. This
source is often common for many different types of plant equipment, resulting in
long power cables to the AC 800M Controller. Furthermore, heavy load changes can
cause variations in controller supply voltage making it necessary to take precautions
against low voltage in order to prevent controller malfunction.
Should there be a risk that the +24 V at the PM8XX power terminals could drop
below 19.2 V for more than 1 ms, then an energy reservoir must be used for
Powering Units.
ABB requires the use of DC/DC converter and extra energy reservoir in case
external DC-supply with longer cables than 10 m is used.
For redundant power supplies to the AC 800M controller and associated units,
always derive connections from the SS8xx voting device. See Figure 61 on page
177.