9905-997 速度感应单元 具有操作员界面
【产品详情】
伍德沃德 ProTech 203 型号 9905-997，带有通电跳闸 220V 交流输入、可锁定外壳以及视觉和声音警报。
该超速保护系统具有三个速度感应单元，包含在锁定的IP 65（类似于NEMA 4）认证外壳中，前面板上的每个单元都有一个操作员界面。此系统有三个 220 Vac 电源，每个单元一个。
跳闸速度设定点、磁拾取 （MPU） 故障设定点、MPU 故障时跳闸、MPU 齿轮齿和 MPU 故障超时是使用每个操作员界面的 LCD 和键盘设置的可调参数。在操作期间，可以在LCD上查看这些参数以及当前速度，峰值速度和跳闸原因。每个速度感应单元的当前速度是该单元 LCD 上显示的默认第一个参数。
单元 A、B 和 C 是相同的，并且都遵循相同的过程来监控原动机速度和执行速度计算。使用 MPU 每 5 ms 对速度进行一次采样，在执行速度计算后，硬件三分之二的投票确定是否满足超速条件。
当任何个单元的当前速度超过其跳变设定点时，任何单个单元都会跳闸，但只有至少两个单元的超速检测才会导致跳闸继电器使原动机脱机。该系统设计还允许在原动机在线时对单个单元进行热更换和测试。
当设备跳闸时，它会保持跳闸状态，直到它被重置或重新通电。在涡轮机启动之前，必须将机组全部重置，但 ProTech 型号 9905-997 具有远程重置功能，以简化此步骤。
9905-997 速度感应单元 具有操作员界面
【英文介绍】
Woodward ProTech 203 Model 9905-997 with powered trip 220V AC input, lockable housing, and visual and audible alarms.
The overspeed protection system features three speed sensing units contained in a locked IP 65 (similar to NEMA 4) certified housing, with an operator interface for each unit on the front panel. This system has three 220 Vac power supplies, one for each unit.
Trip speed set point, Magnetic pick up (MPU) fault set point, trip on MPU fault, MPU gear teeth, and MPU fault timeout are adjustable parameters set using the LCD and keyboard on each operator interface. During operation, these parameters can be viewed on the LCD along with the current speed, peak speed and cause of trip. The current speed of each speed sensing unit is the first default parameter displayed on the unit LCD.
Units A, B, and C are identical and all follow the same process to monitor prime mover speed and perform speed calculations. The speed is sampled every 5 ms using the MPU, and after performing the speed calculation, the hardware votes two-thirds to determine whether the overspeed condition is met.
Any individual unit will trip when the current speed of any unit exceeds its jump set point, but only overspeed detection of at least two units will cause the trip relay to take the prime mover offline. The system design also allows for thermal replacement and testing of individual units while the prime mover is online.
When a device trips, it stays in the trip state until it is reset or powered back on. The unit must be completely reset before the turbine can be started, but ProTech models 9905-997 have a remote reset feature to simplify this step.
9905-997 速度感应单元 具有操作员界面
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