9905-982 超速保护系统 具有三个相同的速度感应单元
【产品详情】
伍德沃德 ProTech 203 电子三选二超速保护系统 9905-982。具有 24V 直流输入、CPU 和 MPU 故障指示以及可锁定的外壳
Woodward ProTech 203 型号 9905-982 具有三个相同的速度感应单元，所有单元都封装在一个锁定的外壳中。如果使用可选的不锈钢轮毂，则此外壳已通过 NEMA 4X 认证。每个单元都配有自己的 120 Vac/dc 电源。
9905-982 是一种通电跳闸型号，这意味着在正常运行期间，投票继电器处于断电状态。为了满足API 612超速跳闸规范，必须将冷盘管监控设备连接到该系统。
有三个磁性拾音器（MPU），每个拾音器都与不同的速度感应单元接口。单元 A、B 和 C 执行单独的速度计算，然后一起执行三分之二的硬件投票。如果一台设备检测到超速情况，则该设备将被跳闸，操作将继续。如果两个单元检测到超速情况，则会在系统中激活跳闸继电器，并关闭操作。
由于 9905-982 型采用模块化设计和三分之二投票配置，因此提供了多种功能来减少系统停机时间。这些功能之一是热更换。如果需要更换任何单独的速度传感单元，可以在不使原动机脱机的情况下将其更换。在这种情况下，保持在线的两个单元将保持对系统的控制并继续提供准确的输出。同样，可以在系统联机时测试单个单元。
9905-982 超速保护系统 具有三个相同的速度感应单元
【英文介绍】
Woodward ProTech 203 Electronic 2 out of 3 overspeed protection System 9905-982. Features 24V DC input, CPU and MPU fault indication, and lockable housing
Woodward ProTech 203 Model 9905-982 has three identical speed sensing units, all housed in a locked housing. If optional stainless steel wheels are used, this housing is NEMA 4X certified. Each unit comes with its own 120 Vac/dc power supply.
The 9905-982 is a power trip model, which means that during normal operation, the voting relay is powered off. In order to meet the API 612 overspeed trip specification, a cold-coil monitoring device must be connected to the system.
There are three magnetic pickups (MPUs), each of which interfaces with a different speed sensing unit. Cells A, B, and C perform separate speed calculations and then together perform two-thirds of the hardware voting. If a device detects overspeed, the device will be tripped and operation will continue. If both units detect overspeed, the trip relay is activated in the system and the operation is shut down.
Due to its modular design and two-thirds voting configuration, the Model 9905-982 offers a variety of features to reduce system downtime. One of these features is hot change. If any individual speed sensing unit needs to be replaced, it can be replaced without taking the prime mover offline. In this case, the two units that remain online will maintain control of the system and continue to provide accurate output. Similarly, individual units can be tested while the system is online.
9905-982 超速保护系统 具有三个相同的速度感应单元
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