Woodward 5500-018模块备件

Woodward 5500-018

505能够使用模拟输入接收来自的负载共享信号
伍德沃德的数字同步器和负载控制（DSLC）。该输入在
与DSLC的结合允许控件与任何
使用DSLC的其他系统。505的内部求和节点将此信号相加
以速度/负载PID为参考。除了负载共享之外，DSLC输入到
505可用于将装置同步到工厂总线或公用事业。
串级控制
级联控制可配置为控制任何系统过程，涉及：
或受涡轮速度或负载的影响。通常，该控制器用作涡轮机
进气或排气压力控制器。
串级控制是一个PID控制器，用于比较4–20 mA过程信号
具有级联设定点。PID控制器设置速度控制器设定值
直到过程信号和设定点匹配。
级联设定点可通过升高或降低命令进行调整
控制装置前部的键盘、远程触点输入或
通信链路。此外，可通过输入新参数直接设置设定点
来自键盘或通过Modbus通信的设定值。此外，a
远程级联设定点模拟输入可编程为远程位置
级联设定点。
远程级联设定点
4–20 mA输入中的一个可以配置为远程调整级联
设定点。远程级联设定点输入直接影响505的级联
设定点。远程输入信号可以改变的大速率
级联设定点可编程，可在运行模式下更改。什么时候
远程设定点启用后，级联设定点将以慢得多的速度移动
直到两个设置值匹配，允许设定点
以大速率移动。可以启用远程级联功能，并且
根据需要从前面板键盘、远程触点输入或
通信链路。
阀门限制器
阀门限制器限制执行器输出信号或阀门位置，以帮助：
启动和关闭涡轮机。阀门限制器的输出与速度/负载和辅助控制通道的输出一起选择低信号。
要求低阀门的控制或限制器通道

Woodward 5500-018

Woodward 5500-018

The 505 is capable of using an analog input to accept a load sharing signal from Woodward’s Digital Synchronizer and Load Control (DSLC). This input in conjunction with the DSLC allows the control to isochronously loadshare with any other system using a DSLC. The 505’s internal summing junction adds this signal with the speed/load PID’s reference. In addition to loadsharing, the DSLC input to the 505 can be used to synchronize the unit to either the plant bus or to the utility. Cascade Control The cascade control can be configured to control any system process, related to or affected by turbine speed or load. Typically this controller is used as a turbine inlet or exhaust pressure controller. The cascade control is a PID controller that compares a 4–20 mA process signal with the cascade setpoint. The PID controller sets the speed controller setpoint until the process signal and the setpoint match. The cascade setpoint is adjustable with raise or lower commands through the keypad on the front of the control, the remote contact inputs, or the communication links. Also, the setpoint can be directly set by entering the new setpoint from the keypad or through Modbus communications. In addition, a remote cascade setpoint analog input can be programmed to remotely position the cascade setpoint. Remote Cascade Setpoint One of the 4–20 mA inputs can be configured to remotely adjust the cascade setpoint. The remote cascade setpoint input directly affects the 505’s cascade setpoint. The maximum rate at which the remote input signal can change the cascade setpoint is programmable and can be changed in the Run mode. When the remote setpoint is enabled, the cascade setpoint will move at a much slower rate until the two settings are matched at which the setpoint will be allowed to move at the maximum rate. The remote cascade function can be enabled and disabled as required from the front-panel keypad, the remote contact inputs or the communication links. Valve Limiter The valve limiter limits the actuator output signal or valve position to aid in starting up and shutting down a turbine. The output of the valve limiter is lowsignal-selected with the output of the speed/load and auxiliary control channels. The control or limiter channel asking for the lowest valv