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MVME162-510A工控备品PLC卡件现货

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MVME162-510A工控备品PLC卡件现货

类目:MOTOROLA
型号:MVME162-510A
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MVME162-510A工控备品PLC卡件现货

MVME162-510A工控备品PLC卡件现货 MVME162-510A工控备品PLC卡件现货 MVME162-510A工控备品PLC卡件现货
MVME162-510A工控备品PLC卡件现货
MVME162-510A工控备品PLC卡件现货
MVME162-510A工控备品PLC卡件现货
系统供水采用变频泵循环方式,以“先开先关”的顺序关泵,工作泵与备用泵不固定死,这样,既保证供水系统有备用泵,又保证系统泵有相同的运行时间,有效地防止因为备用泵长期不用发生锈死现象,提高了设备的综合利用率,降低了维护费用。 (2)系统硬件

系统选用了西门子公司的S7-214PLC,辅以输入/输出扩展模块组成,主要检测元件有光电开关、压力检测开关,共计12个输入信号。执行部件有电机、变频调速器、声光报警器等,共3个输出点。PLC主要完成现场的数据采集、转换、存储、报警、控制变频器完成压力调节等功能。3台水泵由变频器直接驱动,进行恒压控制,变频器的起动、停止分为手动和PLC控制。控制面板上设有一个手动/自动转换开关,PLC对该开关的状态实时检测,当选择手动功能时,PLC只进行检测报警,由人工通过面板上的按钮和开关进行水泵的起、停和切换。当选择自动功能时,所有控制、报警均由PLC完成。控制系统原理图如图1所示。 2 系统软件   为方便调试和编程,系统控制器采用模块化编程,主要由手动运行模块、自动运行模块和故障诊断与报警模块组成。 (1)手动运行模块   当系统处于手动运行时,PLC只接收各电路保护信号和各传感器信号,并由此判断各工作水泵的运行状态,在出现故障的情况下,输出报警信号。水泵的起、停和切换由人工通过面板上的按钮和开关来实现。 (2)自动运行模块

自动运行模块包括系统的初始化、开机命令的检测、数据采集子程序、控制量运算子程序、置初值子程序、电机控制子程序等。模块流程图如图2所示。其中:数据采集子程序完成对主水管压力的数据采集。   控制量运算子程序完成变频器控制量的计算和控制量的输出,其中控制量的计算按PID控制规律进行。

电机控制子程序完成对3台水泵的运行和停止控制。由于变频器的输出频率与水泵的运转速度直接相关,用水量大时,变频器输出频率升高,水泵的运转速度大;用水量小时,频率降低,水泵的运转速度小。因此程序根据变频器的输出频率的大小就可以判断和控制水泵的工作状态。当频率上升到50 Hz(即水泵全速运转时)仍不能满足供水需要时,则PLC自动将一台泵切换到工频运行;第2台泵由变频器供电投入运行,如果第2台泵电机达到满转速时仍不能满足供水要求,则PLC自动将第2台泵切换到工频运行,第3台泵由变频器供电投入运行,依此规律逐个投入运行;当2台泵都处于工频全速运行方式,第3台泵处于变频运行工作方式时,如果此时用水量减小,变频器输出频率下降,当频率到达一定的下限Fmin时,供水量仍大于用水量,则系统自动将第三台泵停止运行。同样,第三台泵停机后,如果此时供水量还大于用水量,则系统自动将第二台泵停止运行,依此类推。程序功能图如图3所示。 (3)故障诊断和报警输出模块 变频器具有短路、过载等保护功能,当变频器所驱动的水泵电机发生短路、过载等故障时,变频器将自动切断一次供电回路,进入保护状态并输出报警信号。系统把各故障点相应的接触器、断路器等元件的辅助触点接到PLC,PLC扫描输入这些触点的状态,并通过PLC程序将这些状态存放在数据存储区,再结合控制程序和设备预置状态进行逻辑分析,判断设备或元件是否出了故障,如果发生故障,则切断该泵的接触器,然后对变频器复位,再将备用水泵的接触器接通,启动变频器运行备用泵,同时输出该泵故障报警信号。如电机故障指示灯亮等。各I/O点对应的故障信息如表1所示,报警回路梯形图如图4所示。


3 结语   变频调速恒压供水系统具有节能、安全、高品质的供水质量等优点。the division ratio of 1:10 or ≤ 1:10, they enter the mixer for full mixing to achieve homogenization. When the set sampling time is reached, the control RAM will open automatically, the sampling spoon will move to the right, and the samples with fixed capacity (about 150g) will be transferred into the sample cylinder in the sample cylinder holder. The excess samples will enter the feeder, and the materials in the feeder will accumulate more and more, The material level rises gradually. When it comes into contact with the anti rotation level meter, the ash return fan starts to blow the materials in the reclaimer back to the grinding system. Under the control of a set of pneumatic mechanical device, the sample cylinder automatically completes the capping, steering and other actions, and is transmitted to the receiving station 100 meters away under the blowing of the sample cylinder (shell) transmission fan. After the receiving station takes out the samples, it is sucked back to the sampling station, The sample cylinder returns to the initial receiving position, repeats the cycle and completes the sampling function. The execution of all actions is controlled by a simatic50 small programmable controller. 2 common faults and solutions of automatic control part 2.1 the level meter is out of control. During use, due to the lax sealing of the system, when the ash return fan runs, the system has positive pressure and ejects some sample powder, resulting in the increase of ambient dust concentration. Dust is easy to flow into the material level meter, resulting in misoperation of the contact of the material level meter. Sometimes the ash return fan runs continuously. Sometimes the fan should have started to perform soot blowing action but does not run because there is no signal, resulting in excessive ash accumulation in the feeder until it enters the divider and then into the mixer. Finally, the mixer is overloaded and the overcurrent protection switch loses its protection function, Cause the motor to burn down for many times. After cleaning, although