SD83x电源单元设计用于满足EN 50178欧洲标准化报告中规定的所有适用的电气安全数据以及EN 61131-2和UL 508所要求的附加安全和功能数据。第二输出电路可用于SELV或PELV应用。这些电源供应器是转换手动电压为24伏特的开关模式电源装置。这些电源供应器可用于非备援及备援应用程式。冗馀应用要求二极管表决单元SS823或SS832。使用SD83x系列电源装置时，无需安装手部滤波器。它们提供了软启动功能;S7-1200可编程控制器。SD83x 电源单元旨在满足 EN 50178 统一欧洲标准出版物中规定的所有适用电气安全数据以及 EN 61131-2 和 UL 508 要求的其他安全和功能数据。
SD834
次级输出电路适用于 SELV 或 PELV 应用。它们是开关模式电源单元，可将电源电压转换为 24 伏直流电。这些电源可用于非冗余和冗余应用。冗余应用需要二极管投票单元SS823或SS832。使用SD83x系列电源单元，无需安装电源滤波器。它们提供软启动功能;SD83x 的上电不会触发保险丝或接地故障断路器。特点和优点简单的DIN导轨安装I 类设备（连接到保护接地时，（PE））过电压类别 III 用于连接到主主TN 网络次级回路与初级回路的保护性隔离适用于 SELV 和 PELV 应用单元的输出具有过流（限流）和过压（OVP）保护SD834可并联，增加输出功率，SD831 和 SD834 的交流和直流输入，SD834 上的浮动 DC-OK 继电器触点 。
SD834
高低加，除氧器都是电厂汽水系统上的重要设备，高低加水位调节门以角行程工作方式，电厂要求带失电保位功能，即当阀门的电源消失时，应使阀门保持当前位置，以避免一旦DCS供来的4~20mA信号（DCS供给阀门的AO信号不冗余）消失，使高低加水位调节门迅速进入全开或全关的位置，而使高低加水位波动，可能引高低加解列，而引起生产事故，我们采用具有断电、断信号保位功能的ABB TZIDC，而无需任何附加的电流继电器或者电磁阀就能实现断信号保护，当DCS的信号消失时，锁住高低加调节门的汽缸气源，由此实现失电保位功能；震动较大的场合：电厂有许多有震动较大的场合，对阀门的抗振能力有较高的要求。ABB TZIDC具有较强的抗振能力，其可动部件很少，同时采用喷嘴挡板工作原理的I/P转换器本身有较强的抗震性能，具有的抗振和抗冲击能力，在震动频率为80 Hz 、加速度。
SD834
The SD83x power unit is designed to meet all applicable electrical safety data specified in the EN 50178 European Standardization Report, as well as additional safety and functional data required by EN 61131-2 and UL 508. The second output circuit can be used for SELV or PELV applications. These power supplies are switch mode power devices that convert manual voltage to 24 volts. These power supplies can be used for non backup and backup applications. Redundant applications require diode voting units SS823 or SS832. When using the SD83x series power supply unit, there is no need to install a hand filter. They provide a soft start function; S7-1200 programmable controller. The SD83x power supply unit is designed to meet all applicable electrical safety data specified in the unified European standard publication EN 50178, as well as other safety and functional data required by EN 61131-2 and UL 508
SD834
The secondary output circuit is suitable for SELV or PELV applications. They are switch mode power supply units that can convert the power supply voltage to 24V DC. These power supplies can be used for both non redundant and redundant applications. Redundant applications require diode voting units SS823 or SS832. Using the SD83x series power unit, there is no need to install a power filter. They provide soft start function; Powering on SD83x will not trigger fuses or ground fault circuit breakers. Features and advantages: Simple DIN rail installation for Class I equipment (when connected to protective grounding, (PE)) Overvoltage Category III is used for protective isolation between the secondary and primary circuits of the main TN network. It is suitable for output of SELV and PELV application units with overcurrent (current limiting) and overvoltage (OVP) protection. SD834 can be connected in parallel to increase output power, and SD831 and SD834 have AC and DC inputs, Floating DC-OK relay contacts on SD834
SD834
High and low pressure heaters and deaerators are important equipment in the steam and water system of power plants. The water level control valve of the high and low pressure heater operates in an angular stroke mode, and the power plant requires a power loss protection function. That is, when the power supply to the valve disappears, the valve should be kept in its current position to avoid the disappearance of the 4-20mA signal (the AO signal provided by the DCS to the valve is not redundant), causing the water level control valve of the high and low pressure heater to quickly enter the fully open or fully closed position, If the water level of the high and low pressure heaters fluctuates, it may cause the disconnection of the high and low pressure heaters and cause production accidents. We use ABB TZIDC with power off and signal off protection functions, without the need for any additional current relays or solenoid valves to achieve signal off protection. When the DCS signal disappears, the cylinder air source of the high and low pressure heater regulating valve is locked, thereby achieving power off protection function; Large vibration occasions: There are many occasions in power plants where there is significant vibration, and there are high requirements for the anti vibration ability of valves. ABB TZIDC has strong vibration resistance, with few movable components. At the same time, the I/P converter, which uses the working principle of nozzle baffle, has strong seismic performance and has the ability to resist vibration and impact. At a vibration frequency of 80 Hz and acceleration
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