9905-884 数字超速跳闸设备 监控超速情况 WOODWARD

【产品详情】

伍德沃德 9905-884 型 ProTech 203 数字超速跳闸设备，通过三个磁性拾音器 （MPU） 感应原动机速度。

9905-884 型使用磁性拾音器 （MPU） 每 5 ms 对原动机速度进行采样，并监控超速情况。如果满足条件，则会导致跳闸继电器。9905-884 系统是 ProTech 203 系列通电跳闸型号之一。该系统的 0.1%（25 °C）精度等级和三分之二的投票配置设计让操作员高枕无忧。

型号 9905-884 中的速度感应单元 A、B 和 C 是相同的。每个都有操作员界面和一个 24 Vdc 电源。系统编程通过具有LCD和键盘的操作界面完成。为防止未经授权的更改，使用钥匙开关限制对程序模式和测试功能的访问。每个接口还具有 LED 指示灯和报警输出，可在设备跳闸、MPU 故障、CPU 故障等情况时提醒操作员。

在涡轮机启动之前，必须重置三个单元中的每一个。单个单元在跳闸后必须复位（如果电源重启，则无需复位）。9905-884 型具有远程复位功能，使此过程更简单。

当前速度和峰值速度都可以在设备的 LCD 上查看。如果峰值速度超过先前记录的峰值速度，则每次发生超速情况时，都会更新峰值速度。如果新的峰值速度是超速条件（而不是测试）的结果，则将其存储在非易失性存储器中。

可在 ProTech 203 手册 85191（版本 B）中找到可在 LCD 上显示的参数的完整列表 。本手册还包含安装说明和要求，在安装型号 9905-884 之前应查看。该型号的外壳具有可选的不锈钢轮毂。使用这些机箱时，外壳符合 NEMA 4X 标准。

9905-884 数字超速跳闸设备 监控超速情况 WOODWARD

【英文介绍】

The Woodward Model 9905-884 ProTech 203 digital overspeed trip device senses the prime mover speed via three magnetic pickups (MPUs).

The Model 99005-884 uses a magnetic pickup (MPU) to sample the prime mover speed every 5 ms and monitor overspeed. If the condition is met, it causes the relay to trip. The 9905-884 system is one of the ProTech 203 series power trip models. The system's 0.1 percent (25 °C) accuracy rating and two-thirds voting configuration design give operators peace of mind.

The speed sensing units A, B, and C in Model 9905-884 are identical. Each has an operator interface and a 24 Vdc power supply. System programming is done through an operating interface with LCD and keyboard. To prevent unauthorized changes, use key switches to restrict access to program modes and test functions. Each interface also has an LED indicator and alarm output to alert the operator in case of device trip, MPU failure, CPU failure, and more.

Before the turbine can be started, each of the three units must be reset. Individual units must be reset after tripping (if the power supply restarts, no reset is required). The Model 9905-884 has a remote reset function to make this process easier.

Both the current speed and peak speed can be viewed on the device's LCD. If the peak speed exceeds the previously recorded peak speed, the peak speed is updated each time an overspeed situation occurs. If the new peak speed is the result of overspeed conditions (rather than a test), it is stored in non-volatile memory.

A complete list of parameters that can be displayed on the LCD can be found in the ProTech 203 manual 85191 (version B). This manual also contains installation instructions and requirements that should be reviewed before installing Model 9905-884. The case of this model has optional stainless steel wheels. When using these cases, the housing complies with the NEMA 4X standard.

9905-884 数字超速跳闸设备 监控超速情况 WOODWARD

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