FOXBORO 0399071D 0303440C+0303443B模拟量输入模块

FOXBORO 0399071D 0303440C+0303443B模拟量输入模块DEH升速过程采用主汽门(TV)控制，当升速到2950 r／min时，切换阀门，由主汽门控制切换为高压调门(GV)控制，后定速3000 r／min。
常规的阀切换经常由于TV与GV的开起和关闭速率配合不好而造成的汽机转速波动很大[1]，为此，通过改进阀切换控制方案：阀切换开始时，开高调门系数由1逐渐变为0，并且转速PID同时作用于TV和GV，即：
GV阀位输出＝开高调门系数×100＋（1－开高调门系数）×阀位给定（转速PID输出）
TV阀位输出＝（1－开高调门系数）×100＋开高调门系数×阀位给定（转速PID输出）
采用新的阀切换控制方案后，在机组的各次起动中，汽轮机转速在DEH进行阀门切换过程中非常稳定，转速波动不超过5 r／min，满足了DEH 汽轮机转速控制的要求。
双冗余LVDT低选功能设计
LVDT双通道高选位置反馈方式，若两个LVDT同时断线，则油动机将全开，因此不满足伺服系统安全设计原则。因此将原LVDT断线检测判断后，拉低LVDT解调后的直流电压，改为拉高LVDT直流电压；将原LVDT直流电压高选电路，改为低选电路，这样若单个LVDT断线，该LVDT直流电压大于阀位指令电压，由于采用低选电路，将不影响伺服系统的正常工作。若两个LVDT均断线，LVDT直流电压大于阀位指令电压，油动机将全关。这样修改后可同时满足安全和冗余设计原则。The DEH speed raising process is controlled by the main throttle valve (TV). When the speed rises to 2950 r/min, the valve will be switched. The main throttle valve control will be switched to the high pressure control valve (GV) control, and the final speed will be fixed at 3000 r/min.
Conventional valve switching often results in large turbine speed fluctuation due to poor matching of TV and GV opening and closing rates [1]. Therefore, the control scheme of valve switching is improved: at the beginning of valve switching, the opening high regulating valve coefficient gradually changes from 1 to 0, and the speed PID acts on TV and GV simultaneously, namely:
GV valve position output=open high regulating valve coefficient × 100 ＋ (1 － coefficient of opening high regulating valve) × Valve position setting (speed PID output)
TV valve position output=(1 - coefficient of opening high regulating valve) × 100+coefficient of opening high regulating valve × Valve position setting (speed PID output)
After adopting the new valve switching control scheme, during each startup of the unit, the turbine speed is very stable during the valve switching process of DEH, and the speed fluctuation does not exceed 5 r/min, meeting the requirements of DEH turbine speed control.
Design of dual redundancy LVDT low selection function
LVDT dual channel high selection position feedback mode, if two LVDTs are disconnected at the same time, the hydraulic servo motor will be fully opened, so it does not meet the safety design principle of the servo system. Therefore, after the original LVDT disconnection detection and judgment, the DC voltage after LVDT demodulation is pulled down and the DC voltage of LVDT is pulled up; The original LVDT DC voltage high selection circuit is changed to a low selection circuit, so that if a single LVDT is disconnected, the LVDT DC voltage is greater than the valve position command voltage. Since the low selection circuit is used, the normal operation of the servo system will not be affected. If both LVDTs are disconnected, and the LVDT DC voltage is greater than the valve position command voltage, the hydraulic servo motor will be fully closed. In this way, both safety and redundancy design principles can be met after modification
主营产品简介
专注于DCS、PLC、机器人控制系统、大型伺服四大系统领域。

主营产品各种模块/卡件，控制器，触摸屏，伺服驱动器。

优势：供应进口原装正品，专业停产配件，

发货快，货期精准，

主营品牌包括 ABB贝利、GE/FUANC、FOXBORO、英维思TRICONEX 、本特利BENTLY、A-B罗克韦尔、艾默生EMERSON 、OVATION、MOTOROLA、XYVOM、霍尼韦尔HONEYWELL 、力士乐REXROTH、KUKA、NI、DEIF、横河、伍德沃德WOODWARD、瑞恩、施耐德SCHNEIDER 、安川、 穆格MOOG、PROSOFT等品牌。

只卖库存产品;出完需订货!价格以客服说明为准!!订货货期以客服说明为准，有任何疑问请联繁客服! Limited stock, Contact US!

●使用前:

在操作和维护，安装设备之前，请阅读并严格遵守安全相关的信息。

Read and strictly follow safety-related information before operatingmaintainingand installing equipment.

●使用者要求:

必须从事安装，组装或维护设备等相关工控电气机械以及其他相关技术的人员。

Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.应用范围:

应用于品牌本系列工业以及生产生活自动化设备产品。

Used in the brand of this series of industriaand production automation eauipment products

适用于场景:系统集成，非标定制，产线升级改造，原设备电气替换等等。

Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

●操作人员:

应该由本品牌专业培训操作员来安装、操作和维修设备。专业人员具有技术能力强，熟悉安全信息和安全实施:

熟悉设备的安装加工、操作和维护:熟悉处理所有的潜在危险情况。

Equipment should be installed,operated and maintained by trained operators from the brand

●危险情况

警告

.请注意使用人员的人身安全。

●除了产品特性以及功能，还需了解产品的使用寿命环境。

●充分学习产品使用手册，否则非专业人员可能会造成人身危险。

Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.

●服务行业

适用水泥，木业，石业，橡胶，石油，化工，发电，环保，水处理，制冷，交通，钢铁，食品，饮料，船舶，制冷等行业

Applicable to cementwood,stone,rubber,petroleumchemical, power generation