基于PLC的离心风机变频调速控制系统中英文资料

System structure and control scheme system design features The control system of ventilation units with centrifugal activation of interlocking and over-temperature protection. And conventional relays compared to the implementation of the ventilation system, PLC system has a low failure rate, high reliability and wiring is simple, easy maintenance and many other advantages, PLC control functions so that thventilation systems greatly enhance the degree of automation, reducing the labor jobs intensity. PLC and frequency converter with the use of air pressure transmitter, allowing the system to control the security, reliability, greatly improved, but also run the fan significantly reduce the failure rate, not only saves energy but also improve the operation rate of equipment. Mine ventilation system to meet the requirements of automatic control system the specific design requirements are as follows: (1) This system provides manual / automatic mode of the two, with a state of alarm display and features such as faults. (2) Analog PID operator via pressure input, output analog converter control. (3) In the automatic mode, when the downhole pressure below the set pressure limit, two sets of fans will be running to work at the same time, at the same time and issued instructions and alarm signals. (4) Analog input gas, when the gas concentration is greater than the upper limit of alarm settings, and report to the police to give directions. When the gas concentration is greater than the upper limit of power settings, PLC will cut off the face and wind power generating units to prevent the gas explosion. (5) The use of temperature sensors measured temperature or the wind bearing unit stator temperature, bearing temperature or when the stator temperature exceeds the set alarm on the line, give directions and warning signals. When the stator temperature or the wind bearing temperature exceeds the set temperature of the line unit conversion, PLC will cut off the instructions and alarm signal and automatically cut off the air unit is currently running in automatic mode and can automatically access another run Typhoon unit, if in the hand dynamic manner, staff manually switch 1. (6) In order to prevent fatigue centrifugal fan operation in any state, set the fan to run in a total time will automatically switch to another unit operation typhoon. system architecture and program Ventilation control system is mainly composed of 2 sets of centrifugal fans, centrifugal fans each have two motors, each motor drives a set of fan films, two films on the rotating fan and a set of wind suction, a group to increase wind speed, for the wind to carry out underground. Underground air volume in accordance with the different, using different types of fans. The design of 2 45 kW fan as an example, the selection of a S72200 PLC, the air pressure sensor and transducer, such as the formation of a complete closed-loop control system. Including contactors, intermediate relays, thermal relays, Mine Explosion-proof magnetic starter, circuit breaker protection of electrical systems, electrical and PLC to achieve effective protection, as well as motor control switch.PLC control system with the fan motor to start and run, monitor, interlock and over-temperature protection. PLC and with the use of air pressure transmitter, allowing the system tocontrol the security, reliability, greatly improved, but also run the fan significantly reduce the failure rate and improve the operation rate of equipment 2. For coal mine ventilation system to meet the requirements of automatic control, design of control programs is as follows: The system provides manual / automatic mode of the two, with scene control, status display and alarm failure. In manual mode, the fan control through the switch from the effects of air pressure inside the mine. In order to prevent fatigue fan running, in any state in the cumulative fan run time set to switch to another machine running the typhoon. A Group B Group centrifugal fan centrifugal fan with two switches can be converted. Time cycles and timing can be randomly set. Are sound and light alarm signal form. Voice Alarm (electric flute) button can be used to lift, alarm troubleshooting instructions automatically disappear. In automatic mode, the use of air pressure FarEasTone mine detection sensors within the pressure signal, the signal transmitter will transform the site into a unified standard signal (eg, 4 20 mA DC current signal, 0 5 V DC voltage signal, etc.) , into the A / D converter analog-digital conversion module, and then into the PLC, PLC to detect the pressure value with set values of pressure and deal with the work of the output signal to control fan. When the air pressure inside the mine in an atmospheric pressure or in the setting of a value above atmospheric pressure, the work of centrifugal fan centrifugal fan with back-up cycle of the work; when a sudden accident, the mines air pressure is lower than a set of atmospheric pressure value, the work of centrifugal fan centrifugal fan with back-up cycle is no longer work, and automatically switch to the work at the same time, increase the volume of the mine ventilation, mine until the pressure rose to values set above atmospheric pressure, the work of ventilation centrifugal fan with back-up machine to resume the cycle of work 3. Gas in the mine for wind systems, coal mine gas concentration in the gas concentration detection sensor with a transmitter signal will be the site transform into a unified standard signal, into the A / D converter analog-digital conversion module, and then into the PLC , the same will be detected by the PLC and set numerical values for comparison, when the gas concentration greater than the value after the set, PLC output signals to control fan to stop working, and the output signal power was automatically cut mine to meet the requirements of wind power interlock to avoid electronic sparks lit the gas to prevent gas explosion accident.系统的设计功能本控制系统具有离心通风机组的启动、互锁和过热保护等功能。与常规继电器实施的通风系统相比，PLC系统具有故障率低、可靠性高、接线简单、维护方便等诸多优点，PLC的控制功能使通风系统的自动化程度大大提高，减轻了岗位人员的劳动强度。PLC和变频器与空气压力变送器配合使用，使系统控制的安全性、可靠性大大提高，也使通风机运行的故障率大大降低，不仅节约了电能，而且还提高了设备的运转率。为满足矿井通风系统自动控制的要求，系统的具体设计要求如下：（1）本系统提供手动自动两种工作模式，具有状态显示以及故障报警等功能。（2）模拟量压力输入经PID运算，输出模拟量控制变频器。（3）在自动方式下，当井下压力低于设定压力下限时，两组风机将同时投入工作运行，同时并发出指示和报警信号。（4）模拟量瓦斯输入，当矿井瓦斯浓度大于设定报警上限时，发出指示和报警。当瓦斯浓度大于设定断电上限时，PLC将切断工作面和风机组电源，防止瓦斯爆炸。（5）运用温度传感器测定风机组定子温度或轴承温度，当定子温度或轴承温度超过设定报警上线时，发出指示和报警信号。当定子温度或轴承温度超过设定风机组转换温度界线时，PLC将切断指示和报警信号并自动切断当前运行风机组，在自动方式下并能自动接入另一台风机组运行，若在手动方式下，工作人员手动切换1。（6）为防止离心风机的疲劳运行，在任何状态下，风机在累计运行设定时间后都会自动切换至另一台风机组运行。结构和方案通风控制系统主要由 2 台离心风机组成，每台离心风机有两台电机，每台电机驱动一组扇片，两组扇片是对旋的，一组用于吸风，一组为增加风速，对井下进行供风。根据井下用风量的不同，采用不同型号的风机。本设计以风机 2 45 kW 为例，选用一台S72200 PLC、空气压力传感器和变频器等组成一个完整的闭环控制系统。其中还包括接触器、中间继电器、热继电器、矿用防爆型磁力启动器、断路器等系统保护电器，实现对电机和 PLC的有效保护，以及对电机的切换控制。本PLC控制系统具有对通风机的电动机启动与运行，进行监控、联锁和过热保护等功能。PLC与空气压力变送器配