浅析继电器在化工仪表控制系统中的应用

本文以和泉RJ系列IDEC RJ2S-CLD-D24薄型功率继电器为例,简单介绍了继电器的工作原理以及通过不同接线方式实现不同功能的应用实例。在数字量输入信号控制回路中,继电器发挥隔离保护及遥控监测功能,既避免了220VAC或380VAC电压窜入到24VDC回路中,又实现了现场电动机运行反馈、就地/远程切换等状态的监测与报警。在数字量输出信号控制回路中,通过干接点和湿接点两种不同的接线方式,继电器不仅可以实现电磁阀的开/关、指示灯的亮/灭等小型设备的控制功能,还可以实现大型机泵远程启动/停止的控制功能。因此,在化工仪表自动控制系统中,通过对继电器科学合理地深入应用,不仅可以提高控制系统的安全稳定性,还减少了人工劳动强度,实现了企业高效率的稳定运行。

Analysis on the Application of Relay in Chemical Instrument Control System

This article takes the IDEC Global RJ series IDEC RJ2S-CLD-D24 thin power relay as an example,briefly introduces the working principle of the relay and the application examples of different functions realized by different wiring methods.In the digital input signal control loop,the relay plays the role of isolation protection and remote monitoring,which not only prevents 220VAC or 380VAC voltage from entering the 24VDC loop,but also realizes the monitoring and alarm functions of on-site motor operation feedback,local/remote switching,etc.In the digital output signal control loop,through the two different wiring methods of dry and wet contacts,the relay can not only realize the control functions of small equipment such as the opening/closing of the solenoid valve,and the on/off of the indicator light,but also can realize the control function for remote start/stop of pump.Therefore,in the chemical instrument automatic control system,through the scientific and reasonable in-depth application of the relay,not only can the safety and stability of the control system be improved,but also the labor intensity is reduced,and the stable and efficient operation of the enterprise is realized.