9905-989 测速探头 采用模块化设计的在线测试

【产品详情】

伍德沃德的 9905-989 型显示每个测速探头的实际速度，显示最高速度信号，以及采用模块化设计的在线测试

ProTech 超速保护型号 9905-989 可监控原动机速度以应对超速情况。这是通过使用三个磁性拾音器（MPU）来完成的，这些拾音器与三个单独的，相同的速度传感单元接口。速度每 5 ms 采样一次，单元 A、B 和 C 执行单独的速度计算。随后的硬件三分之二投票确定是否激活跳闸继电器。如果只有一个单元检测到超速情况，则该单元将跳闸，但另外两个单元将继续运行并继续提供准确的输出。

每个设备的当前速度可以在位于前面板上的该设备的LCD上查看。每个单元的峰值速度也可以在这里查看。当检测到超速情况时，如果速度超过该装置先前记录的峰值速度，则会更新新的峰值速度并将其存储在非易失性存储器中。

每个单元还具有键盘、LED 指示灯和电位计。9905-989 型的速度感应单元都包含在同一个锁定的 IP 65（类似于 NEMA 4）认证外壳中。单元 A、B 和 C 都配有自己的 2V 直流电源。

9905-989系统的某些功能是通过设备的模块化设计实现的。当其中一个单元脱机时，此系统能够运行，从而允许在单元测试（内置自检）、任何单元的故障排除和单元更换期间继续运行。该 ProTech 模型的一些附加功能是远程复位、报警输出和 LED 指示灯。此断电跳闸设备的完整产品规格在伍德沃德 ProTech 手册 85196 中。

9905-989 测速探头 采用模块化设计的在线测试

【英文介绍】

Woodward's Model 9905-989 displays the actual speed of each speed probe, displays the maximum speed signal, and uses a modular design for online testing

The ProTech overspeed protection model 9905-989 monitors the prime mover speed for overspeed situations. This is done by using three magnetic pickups (MPUs) that interface with three separate, identical speed sensing units. The speed is sampled every 5 ms, and cells A, B, and C perform separate speed calculations. The subsequent hardware two-thirds vote determines whether to activate the trip relay. If only one unit detects an overspeed situation, that unit will trip, but the other two units will continue to operate and continue to provide accurate output.

The current speed of each device can be viewed on that device's LCD located on the front panel. Peak speeds for each unit can also be viewed here. When an overspeed condition is detected, if the speed exceeds the peak speed previously recorded by the device, the new peak speed is updated and stored in non-volatile memory.

Each unit also has a keyboard, LED indicator and potentiometer. The Type 9905-989 speed sensing units are all contained in the same locked IP 65 (similar to NEMA 4) certified housing. Units A, B and C are equipped with their own 2V DC power supply.

Some of the functions of the 9905-989 system are realized through the modular design of the equipment. This system is capable of running when one of the units is offline, allowing continued operation during unit testing (built-in self-testing), troubleshooting of any unit, and unit replacement. Some of the additional features of the ProTech model are remote reset, alarm output and LED indicators. The complete product specifications for this power trip device are in Woodward ProTech manual 85196.

9905-989 测速探头 采用模块化设计的在线测试

【其他型号推荐】