ABB D674A905U01电磁流量计
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ABB D674A905U01此外，重负载变化会导致控制器电源电压的变化，因此有必要对低电压采取预防措施，以防止控制器故障。如果PM8XX电源端子处的+24 V电压有可能在超过1 ms的时间内降至19.2 V以下，则必须为发电机组使用储能器。如果使用电缆长度超过10m的外部直流电源，ABB需要使用DC/DC转换器和额外的储能器。对于AC 800M控制器和相关单元的冗余电源，始终从SS8xx表决设备获得连接。参见第177页的图61。本节描述了AC 800M控制器的操作，包括ABB D674A905U01（单或冗余配置）处理器单元以及各种可选单元。有关可选装置的其他技术信息，请参阅附录A“硬件装置”。AC 800M控制器（PM8xx）配有控制软件，安装在AC 800M硬件平台上的基本ABB D674A905U01硬件单元构成了AC 800M的控制器。LED指示灯-有关放置说明，请参见第32页的图2。表20。PM8xx–LED指示灯标记颜色功能F（故障）红色正常状态–关闭重新启动（INIT）暂时点亮F（故障。也可以通过软件程序操作。R（un）绿色正常状态–ON重新启动（INIT）暂时熄灭R（un）。重启时，按下（INIT）按钮（3秒或更长时间），直到R（un）闪烁。也可以通过软件程序操作。ABB D674A905U01
ABB D674A905U01Furthermore, 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.This section describes the operation of the AC 800M Controller, comprising aABB D674A905U01 (single or redundant configuration) processor unit, together with various optional units. For additional technical information on optional units, see Appendix A, Hardware Units. AC 800M Controller (PM8xx) Equipped with Control Software, the basic ABB D674A905U01 hardware units mounted on the AC 800M hardware platform constitute an AC 800M Controller. LED Indicators See Figure 2 on page 32, for description of placement. Table 20. PM8xx – LED Indicators Marking Color Function F(ault) Red Normal state – OFF Re-start (INIT) temporarily lit F(ault). May also be operated by software program. R(un) Green Normal state – ON Re-start (INIT) temporarily extinguishes R(un). At restart press the (INIT) push button (3 sec. or more) until R(un) flashes. May also be operated by software program.ABB D674A905U01
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