Woodward 5503-279模块备件

Woodward 5503-279

位置将控制
阀门位置。因此，阀门限制器限制大阀门位置。这个
阀门限制器可通过键盘、外部触点闭合或
Modbus命令。
气门限制器还可用于诊断和排除系统动力学问题。如果
据信，505是系统不稳定的根源，阀门限制器可能
定位成手动控制阀位置。应该小心
当以这种方式使用阀门限制器时，以免系统到达
危险的操作点。
手动85017V1 505数字调速器
伍德沃德11
起始特征
505提供三种不同启动模式的选项：自动、半自动和手动。必须对其中一种模式进行编程，以获得
汽轮机从停机状态切换到低转速下的转速控制。开始
模式配置和小调速器控制速度将取决于正常值
电厂启动程序和涡轮机制造商的建议。
如果怠速被编程（怠速/额定或自动启动顺序模式），
505可提供自动速度控制和临界速度避免。A.
“运行”命令可通过505键盘、远程触点输入或
Modbus通信。此外，可选的“启动许可”触点输入
可以进行编程，以防止在节气门跳闸或停止时启动
阀门未关闭。
空闲/额定
怠速/额定功能使操作员能够在
编程怠速和配置速率下的编程额定速度。这个
可通过前端选择怠速或额定转速设定点位置
面板键盘，通过远程触点输入，或通过Modbus
通信链路。怠速/额定功能也可编程为
仅斜坡至额定功能。
自动启动序列
自动启动顺序功能使操作员能够从指定的顺序启动
编程设定的低怠速，保持在此位置，直到编程设定的预热时间结束
过期，然后转到编程设定的高怠速，保持到
编程的高怠速预热时间已过期，后移至
编程额定速度设定点。保持时间和加速率为：
取决于基于时间的涡轮机是“热”还是“冷”
涡轮机已关闭。当涡轮机处于热态和冷态之间时
条件下，控制在热数据点和冷数据点之间插值，以
确定适当的启动速率和保持时间。
如果需要，可通过编程停止和启动自动启动序列
并使用自动启动序列停止/继续命令。halt的选择
或可通过505键盘、远程触点输入或
Modbus通信。此外，自动启动顺序可以是
编程为在每个怠速设定点自动停止。

Woodward 5503-279

Woodward 5503-279

position will control valve position. Thus, the valve limiter limits the maximum valve position. The valve limiter can be adjusted through the keypad, external contact closures, or Modbus commands. The valve limiter can also be used to troubleshoot system dynamics problems. If it is believed that the 505 is the source of system instability, the valve limiter can be positioned to manually take control of the valve position. Care should be taken when using the valve limiter in this fashion, so as to not allow the system to reach a dangerous operating point. Manual 85017V1 505 Digital Governor Woodward 11 Starting Features The 505 provides options for three different starting modes: automatic, semiautomatic, and manual. One of these modes must be programmed to get the turbine from a shutdown state to speed control at minimum speed. The start mode configured and minimum governor controlling speed will depend on normal plant starting procedures and turbine manufacturer’s recommendations. If an idle speed is programmed (either idle/rated or auto start sequence modes), the 505 can provide automatic speed control and critical speed avoidance. A ‘Run’ command can be given through the 505 keypad, a remote contact input, or Modbus communications. In addition, an optional ‘Start Permissive’ contact input can be programmed to prevent a start if, for example, the trip-throttle or stop valve is not closed. Idle/Rated The idle/rated function gives an operator the ability to move between a programmed idle speed and a programmed rated speed at a configured rate. The selection of idle or rated speed setpoint positions can be made through the front panel keypad, through remote contact inputs, or through the Modbus communications links. The idle/rated function can also be programmed as a ramp-to-rated function only. Auto Start Sequence The auto start sequence function gives the operator the ability to start from a programmed low idle speed, hold there until the programmed warm-up time has expired, then go to a programmed high idle speed, hold there until the programmed high idle warm-up time has expired, and finally move to the programmed rated speed setpoint. The hold times and the acceleration rates are dependent on whether the turbine is considered ‘hot’ or ‘cold’ based on the time the turbine has been shut down. When the turbine is between hot and cold conditions, the control interpolates between the hot and cold data points to determine the appropriate startup rates and hold times. The auto start sequence can be stopped and started, if desired, by programming and using the auto start sequence halt/continue commands. The selection of halt or continue can be made through the 505 keypad, remote contact inputs or Modbus communications. In addition, the auto start sequence can be programmed to automatically halt at each idle setpoint.