ZKZ-3/T type speed monitoring device is connected with the speed pulse sensor, signal of voltage transformer, the speed of real-time monitoring of hydrogenerator and in the unit the speed output switch quantity signal and corresponds to the rotational speed of the unit, analog signal, automatic start and stop and power plant monitoring system service.

Two, features

Exergy ZKZ-3/T type speed monitoring device set frequency meter, tachometer, speed relay, speed testing instrument in one, is a multipurpose speed monitoring instrument;

- speed measurement using the principle of advanced measurement gate door cycle, has the characteristics of high measuring precision, strong real-time;

Device control precision depends only on the error and stability of the crystal, so speed contact export value can maintain long-term operation and does not change;

- speed contact output used to difference the locking prevents the waveform distortion caused by the misoperation of the output, according to the needs of the plant operation can be at the scene easily speed are exported to eight values for a range of tuning.

- the device has a standard 4 ~ 20mA current output, optional RS485 (MODBOS RTU), communication output can facilitate the connections and computer monitoring system of the whole plant.

Three, the main technical performance

A number of measurement signals: pulse signal, a PT signal (or magnetic signal)

Measurement frequency range: 0.05 ~ 100Hz

The measurement accuracy: the nonlinear degree is 1%, the speed of the dead zone is 0. 2%

Digital content: generator frequency, speed of rotation, the output of the whole set value.

The output signal of the switch output signal: the speed value signal: 8 way, each point can be determined by the user within the range specified.

1 way (SPST) of the output signal of the alarm output signal of the unit

Device power failure alarm signal 1 way

Analog output: 4 ~ 20mA (corresponding to the unit speed 0%Ne ~ 200%Ne)

Communication output: RS485 (RTU MODBOS)

Working environment: temperature 50 ~ 0 humidity < 85%

Dimensions: 160 x 80 x 250mm

Working mode: continuous

Power supply: DC110 ~ 340V or AC85 ~ 265V/50Hz

Power consumption: 12W

四、工作原理

ZKZ-3/T型转速监控装置由齿盘、传感器及监测装置本体三部分构成。监测装置采用了MCS-51系列单片机系统。系统内部分频后产生测量定时脉冲，周期为2us,其测量精度可达0.01HZ,稳定性高，长期不变。显示电路采用高亮度动态显示方案，亮度高。

信号测量电路有隔离、放大、整形功能，两路信号*独立，当齿盘信号断线时，自动切入PT信号，0.3V~250V范围内的信号电压能长期可靠工作，300V以内也能断短期可靠工作。测速齿盘将其方波信号取入计算机内，再换算对应的频率、转速、转速百分比等内容提供显示、记忆。ZKZ-3/T测速装置具有机组蠕动报警功能，当机组停机发生蠕动时，便发出蠕动报警信号。 

五、面板说明

N1~N8输出状态指示灯：输出继电器动作状态指示

四位LED数码管显示窗：显示运行及设置参数

性质指示灯：n%亮，表示显示值为转速百分比

fp亮，表示输入信号源为齿盘信号f_M亮，表示输入信号源为残压信号

按键区：设置操作仪表参数

六、接线端子

电源：电压范围AC85-265V/50Hz或DC110-340V，无极性限制，本仪器无电源开关，电源接上以后便长期连续运行。

PT： 电压互感器输入信号；+24V：脉冲传感器供电电源；f_C ：脉冲输入信号；

COM： 脉冲传感器信号公共端；4~20mA：标准电流模拟量输出端子。

J1~J8：转速输出接点端子（SPST）；J9： 电源异常报警接点（SPST）；

J10： 蠕动输出接点端子（SPST）；GND： 机壳接地。

A、B: RS485通讯输出端子

七、外形及尺寸图