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140ERT85410工控备件PLC模块卡件

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140ERT85410工控备件PLC模块卡件

类目:140系列PLC
型号:140ERT85410
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140ERT85410工控备件PLC模块卡件 140ERT85410工控备件PLC模块卡件 140ERT85410工控备件PLC模块卡件
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140ERT85410工控备件PLC模块卡件 140ERT85410工控备件PLC模块卡件

140ERT85410工控备件PLC模块卡件
LED数码管    3个7段数码管。
小键盘指示灯    上下方向灯UP、DOWN,用于显示上下运行方向;OP指示灯,用于显示操作模式

部件名称
功能说明
LED数码管
3个7段数码管。
小键盘指示灯
上下方向灯UP、DOWN,用于显示上下运行方向;OP指示灯,用于显示操作模式某石化集团有2台石油气压缩机,单机额定功率75kW,一开一备运行方式,而在实际生产中只需大约45kW输出功率。压缩机在低于额定工况下运转,负载率较低,而且其风压与流量大小要靠手动阀调节,操作困难,也浪费大量电能。为此,考虑采用变频调速技术进行改造,用
PLC
实现自动调节和各种控制功能。运行实践证明,该方案稳定可靠,经济效果明显。
一 工艺要求
(1)正常生产过程中,2台压缩机应至少有1台运行,即使在相互切换时,也不允许发生两台机器全部停止的现象。
(2)保持压缩机出口压力在预定值上。
(3)能实现对压缩机运行状态进行分析,以实现预测性检修。
二 系统控制原理
(1)工艺专业设定压缩机管网正常出口压力为P1,而现场实际测定压力为P2,根据ΔP(=P2-P1)值大小由PLC内PID功能模块进行PID运算,控制变频器来改变电动机转速,达到所要求的压力。当ΔP>0时,现场压力偏高,则提高变频器输出频率,使电动机转速加快,提高实际风压;当ΔP<0时,现场压力偏低,则使转速降低,ΔP减小。这样不断调整,使ΔP趋于0,现场实际压力在设定压力附近波动,保证压力稳定。系统结构如图1。

(2)压缩机长期运行,造成各部件间隙变大,这样引起的振动会越来越大,容易造成压缩机各部件的损坏。由PLC对现场振动情况进行判断分析,可提前对压缩机进行计划性维护保养,这样可大大延长设备的使用寿命,提高设备运行可靠性,减少设备故障引起的非计划性停车。
三 设计方案
该方案主要由1台Siemens ECO1-7500/3变频器、1台S7-200型PLC(CPU215/216,配套EM235扩展模块)以及接触器、操作按钮、1台现场压力变送器和2台振动测量装置(振动变送器)组成,用PLC实现压缩机出口压力单回路闭环PID控制以及压缩机起动、停止、切换、故障处理等各种电气控制功能,由振动变送器对压缩机状态进行监控分析,以实现预测性维护维修。主回路如图2。

(1)PID运算功能的实现
S7-200系列中CPU215/216具有32位浮点运算指令和内置PID调节运算指令等特殊功能。使用时,只需在PLC内存中填写1张PID控制参数表(见下表),再执行指令:PID TABLE, LOOP,即可完成PID运算。其中操作数TABLE使用变量存储器VBxfor the transmitter, ensure that each transmitter has an independent power supply, but also isolate and transmit the transmitter signal to DCS. PLC Analog board interface is a two-wire loop power supply mode, and the signal needs to be isolated. How to choose products? Two wire loop power supply mode is a common analog interface. The products suitable for this interface are called two-wire loop isolation series products. The isolation devices inside the isolation transmitter adopt the transformer mode. On the one hand, it transmits the signal, on the other hand, it also transmits the electric energy at the power supply end to the input part, so that various circuits of the input part can work normally. For example, ph2217 and other electrical distribution products. There are several commonly used two-wire distributorsThe commonly used two-wire isolation distributor has two series varieties to choose from. The common point of the two series products is that they can provide an independent isolation power supply for the two-wire transmitter after isolation through the external power supply; The power distribution of the transmitter depends on the PLC and DCS analog quantity transmission equipped on site. First of all, we need to understand how many kinds of on-site system interference will occur? Why interfere? How to solve it? 1) Various automatic instruments, control systems and actuators are needed to realize the monitoring and control of ground circulation interference in the process of industrial production. The signal transmission between them includes small signals ranging from weak to millivolt level and milliampere level; There are large signals of tens of volts, even thousands of volts and hundreds of amperes; There are both low-frequency DC signals and high-frequency