9905-885 独立速度感应单元 监控原动机速度
【产品详情】
9905-885 Woodward ProTech 203 由三个相同的独立速度感应单元组成，可连续监控原动机速度并激活跳闸继电器
ProTech 203 型号 9905-885 是采用 NEMA 4X 标准外壳的超速保护系统 （如果使用可选的不锈钢轮毂）。该器件使用磁性拾音器 （MPU） 来检测超速情况，并在满足条件时激活跳闸继电器。9905-885 型号是三个相同速度感应单元的通电跳闸型号。
该型号拥有 5ms 的速度采样时间，总响应时间仅为 40 ms。它具有 100 Hz 至 32 kHz 的速度感应频率范围。ProTech 203 型号 9905-885 的精度等级为 0.1%（25 °C 时）。
当发生跳闸继电器时，它由报警输出和跳闸速度感应单元前面的 LED 指示。单元的三分之二投票配置意味着如果只有一个单元跳闸，系统可以继续运行。如果两个单元跳闸，系统将停止运行。9905-885 系统的跳变点频率范围为 250 Hz 至 25 kHz。
9905-885 系统前面有三个操作界面，内部每个单元一个。这些接口具有双行 LCD、键盘和自己的一组 LED 功能状态指示灯。LCD可以显示当前速度，峰值速度，跳闸速度设定点和跳闸原因等参数。
9905-885 型的其他特性使其成为超速保护应用的理想选择，包括：
热更换
内置自检
远程复位
MPU 故障指示灯
中央处理器故障指示器
可在 ProTech 9905 手册 885（版本 B）中找到可显示的参数的完整列表以及型号 203-85191 的附加功能。
9905-885 独立速度感应单元 监控原动机速度
【英文介绍】
The 9905-885 Woodward ProTech 203 consists of three identical independent speed sensing units that continuously monitor the prime mover speed and activate the trip relay
ProTech 203 Model 9905-885 is an overspeed protection system with a NEMA 4X standard housing (if optional stainless steel wheels are used). The device uses a magnetic pickup (MPU) to detect overspeed and activate the trip relay when conditions are met. Model 9905-885 is a power trip model with three identical speed sensing units.
This model has a speed sampling time of 5ms and a total response time of only 40ms. It has a speed sensing frequency range of 100 Hz to 32 kHz. ProTech 203 Model 9905-885 has an accuracy class of 0.1% (at 25 °C).
When a trip relay occurs, it is indicated by the alarm output and the LED in front of the trip speed sensing unit. The two-thirds voting configuration of the cells means that if only one cell trips, the system can continue to operate. If two units trip, the system will stop operating. The 9905-885 system has a jump point frequency range of 250 Hz to 25 kHz.
The 9905-885 system has three operating interfaces on the front, one for each unit inside. These ports feature a dual-row LCD, keyboard, and their own set of LED function status indicators. LCD can display the current speed, peak speed, trip speed set point and trip reason and other parameters.
Other features of the Model 9905-885 that make it ideal for overspeed protection applications include:
Hot change
Built-in self-test
Remote reset
MPU fault indicator
CPU failure indicator
A complete list of displayable parameters and additional features for models 203-85191 can be found in ProTech 9905 Manual 885 (version B).
9905-885 独立速度感应单元 监控原动机速度
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