1747-PIC

1747-PIC
1747-PIC
1747-PIC


控制系统结构
　　PLC采用罗克韦尔自动化/ AllenBradley ControlLogix控制系统，完成设备的连续集中控制。采用单CPU处理器，处理器选用1756-L61。
　　各子系统I/O扩展和上位通讯考虑采用符合IEC 61158的开放现场总线ControlNet系统，冗余链路配置。 ControlNet为令牌总线方式的实时控制网，通讯速率5MBit/秒，冗余配置，其上挂接混合型控制器CPM和服务器， ControlNet的传送方式可以保证实时数据何时传送(确定性)，并不会因网上节点的增减而改变 (重复性)，介质为RG6同轴电缆，BNC连接器，长度可达1km，加扩展器可扩展达6km。ControlLogix 系统为多种类型的控制提供了的控制平台，在这一个平台上，就可以实现顺序控制、过程控制、传动或运动控制的任意组合控制。因为这个平台是模块化的，所以就能够有效地设计、建立和更改平台，地节约了工程实施费用。通过先进的组态工具、内存结构和需要较少编程和内存的符号编程，可以大大提高工程的生产率。内存分为程序区和用户数据区，采用完全的自动内存分配机制，开发人员无需人工分配系统内存，支持灵活的网络结构，无需任何编程或者处理器干预，即可实现不同网络之间的通讯桥接和数据交换。
　系统的网络结构如下图所示:每个主排风机有一个独立的控PLC以及 PanelView Plus 1000作为人机界面接口。这些设备以及变频器的PLC通过1756- CNBR模块组成ControlNet网络,这个网络通过烧结主系统的PLC2远程IO站与烧结主系统L1网络连接.变频器(VFD)PLC有一个ControlNet IO网络,两个Point IO 分别控制MB3(Motor1)、MB4(Motor2)的励磁盘，1756-A10框架及20-COMM-C完成变频器本体的控制及数据交换，本地框架主要是高压盘等外围接口状态采集及控制。
　　由于ControlLogix 系统的开放性及灵活性，可以在烧结L1网络的任意位置通过Drive Executive工具对变频器进行组态及维护，也可以由PLC经由ControlNet 网络通过20-COMM-C模块修改变频器控制参数。这里由于两台马达动态参数有较大的差别，为了达到理想的控制效果，在起动前由PLC写入针对该马达的控制参数。程序如图3所示。
实际上，只要对外围系统进行简单的改造，将来本起动装置可以起动一烧结9300KW直流无刷励磁同步电动机，也可以起动规划中的4000-5000KW的脱硫增压风机，而且可以是任何形式的10KV 高压电动机。系统的开放性在这里得到了充分的体现。
　　七、改造效果
　　原有设备拆除，新设备在线安装、调试全部工作在10天内完成，确保了年修节提前36小时完成，实现效益450万元。
　　新设备运转平稳，静止状态下起动成功率，并网冲击小，频率差 <0.1Hz、电压差 <3%、相位差<3°。
　　综上所述，起动装置改造性能指标完全达到设计要求，改造取得圆满成功。


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