SJ-22C Rotational Speed Measurement and Control Device

Introduction

SJ-22C rotational speed measurement and control device can be applied for the rotational speed measurement and protection for thermal and water turbine generator sets, and also for the industry area where rotational speed needs to be measured or a frequency meter independently. 

This device can be configured optionally according to field situation. There are three types totally:

  • SJ-22C rotational speed measurement and control device for both mechanical and electrical input modes.
  • SJ-22P rotational speed measurement and control device for only mechanical input mode.
  • SJ-22F rotational speed measurement and control device,including electrical speed measurement input mode.

Functions

  • Direction judgement and creeping detection
  • Analog output
  • Communication interface
  • Wave recording and memory function
  • Flexible display method
  • High disturbance resistant performance
  • Complete self diagnosis and restoration function

Features

  • Completely passed electromagnetic compatibility test, the results are better than national standards, great disturbance resistant performance.
  • Both mechanical and electrical speed measurement methods combined ideally, outputs strategy is able to be configured, and used conveniently and flexibly. 
  • Specially designed electrical rotational speed sensor, which completely solves the problem that the accurate measurement is not achieved when the residual voltage signal is ultra low frequency and ultra low amplitude.
  • Mechanical rotational speed sensor is used, and the problems on photoelectric sensor or encoder installation difficulty and associated low reliability are overcome.
  • Friendly MMI is convenient for rotational speed setting and display.
  • Maximum value memory, wave recording and over speed analysis software are convenient for over speed result analysis and saving for field.
  • Accurate and stable analog output signal can connect with other system directly.
  • Isolated RS232/RS485 communication interface, Modbus protocol is adopted to support communication with other computers.
  • Simple structure, convenient installation.

Technical Parameters

  • Working power: AC 85 V~265 V, or DC 120 V~360 V
  • Power consumed:<40 W
  • Speed measurement scope
  • Voltage signal: signal amplitude:0.10 V~250 V
  • Signal frequency:0.1 Hz~100 Hz
  • Mechanical rotational speed: 5000 rpm
  • Measurement accuracy:0.01 Hz
  • Analog output: 4 mA~20 mA/0~100 Hz
  • Accuracy : 0.2%
  • Speed measurement output: 8 channels, each 2 ordinary open contactor
  • Alarm output: 1 channel, ordinary open contactor

Engineering Application

SJ-22C has been used widely in dozens of power plants in Hubei province, Fujian province, and shichuan province, Danjiangkou, Gutianxi, and Gongzui hydro-power plants, etc.