1、PLC给信号到变频器时,经常出不必要的故障,比如给假信息,或者变频器不接收信息. 由于客户比较急,也找不到好的处理方法.也没有专业的技术员.只好要求我们技术员赶到现场处理,我们检测了变频器,PLC,电源,设备均正常.初步认定是干扰引起.在PLC的电源模块及输入/输出的电源线上接入滤波器,问题还是得不到明显的改善,后来把变频器和PLC的电源线,控制线分开走线,这时故障才解除..
2、,由三台变频器组成的调速系统(装在同一个变频柜里),出现如下情况:用外接的电位器调频率时,发现异常,变频器转速产生波动.频率波动也比较大.然后就会报故障. 我们到现场后检查了也是查外围电源,负载,电位器,控制线路都正常.后上电运行变频器,在调试变频器时,当一台单独运行时,工作正常不报故障,当三台同时运行时就会出现异常.这就是干扰引起啊! 对策:将三台变频器移出变频柜,分别装在一个单独的变频柜里,电位器也分开,然后改用屏蔽线。最后干扰清除,三台都能同时运行.
3、多段速运行。(3。7KW)变频器单独运行印刷机很正常,当与印刷机的送纸机同步运行时,报软件过流故障。代理商技术员调了一天,没有调好,就认定是我们的机器有问题,不能用要退货。后来到现场维护处理,检测了线路,变频器都无问题。看了一下设备,印刷机里有两台电机,一台主电机,(就是改造的3。7KW的),还有一台是给送纸机用的,起上下降作用。变频器单独运行印刷机正常,就是与送纸机同步运行时报故障。这些动做都是通过接触器,继电器工作。印刷机设备也没有接地,而我们变频器的接地也就是接在印刷机设备上,所以根本没有接地,认定是干扰故障。
1)良好的接地。电机等强电控制系统的接地线必须通过接地汇流排可靠接地,微机控制板的屏蔽地,应单独接地。对于某些干扰严重的场合,建议将传感器、I/0接口屏蔽层与控制板的控制地相连。
2)给微机控制板输入电源加装EMI滤波器、共模电感、高频磁环等,可以有效抑制传导干扰。另外,在辐射干扰严重 的场合,如周围存在GSM、或者小灵通基站时,可以对微机控制板添加金属网状屏蔽罩进行屏蔽处理。
3)给变频器输入端加装EMI 滤波器,可以有效抑制变频器对电网的传导干扰,加装输入交流和直流电抗器,可以提高功率因数,减小谐波污染,综合效果好。在某些电机与变频器之间距离超过100 m 的场合,需要在变频器侧添加交流输出电抗器,解决因为输出导线对地分布参数造成的漏电流保护和减少对外部的辐射干扰。一个行之有效的方法就是采用钢管穿线或者屏蔽电缆的方法,并将钢管外壳或者电缆屏蔽层与大地可靠连接。值得注意的是在不添加交流输出电抗器时,如果采用钢管穿线或者屏蔽电缆的方法,增大了输出对地的分布电容,容易出现过流。当然在实际应用中一般采取其中的一种或者几种方法。
4)对模拟传感器检测输入和模拟控制信号进行电气屏蔽和隔离。在变频器组成的控制系统设计过程中,建议尽量不要采用模拟控制,特别是控制距离大于1m,跨控制柜安装的情况下。因为变频器一般都有多段速设定、开关频率量输入输出,可以满足要求。如果非要用模拟量控制时,建议一定采用屏蔽电缆,并在传感器侧或者变频器侧实现远端一点接地。如果干扰仍旧严重,需要实现DC/DC隔离措施。可以采用标准的DC/DC模块,或者采用对v/f转换光隔离,再采用频率设定输入的方法。 变频器本身抗干扰问题提出几点处理方法: 当变频器的供电系统附近,存在高频冲击负载如电焊机、电镀电源、电解电源或者采用滑环供电的场合,变频器本身容易因为干扰而出现保护。建议用户采用如下措施:
(1) 在变频器输入侧添加电感和电容,构成LC滤波网络。 (2) 变频器的电源线直接从变压器侧供电。 (3) 在条件许可的情况下,可以采用单独的变压器。 (4) 在采用外部开关量控制端子控制时,连接线路较长时,建议采用屏蔽电缆。当控制线路与主回路电源均在地沟中埋设时,除控制线必须采用屏蔽电缆外,主电路线路必须采用钢管屏蔽穿线,减小彼此干扰,防止变频器的误动作。 (5) 在采用外部模拟量控制端子控制时,如果连接线路在1M以内,采用屏蔽电缆连接,并实施变频器侧一点接地即可;如果线路较长,现场干扰严重的场合,建议在变频器侧加装DC/DC隔离模块或者采用经过V/F转换,采用频率指令给定模式进行控制。 (6) 在采用外部通信控制端子控制时,建议采用屏蔽双绞线,并将变频器侧的屏蔽层接地(PE),如果干扰非常严重,建议将屏蔽层接控制电源地(GND)。对于RS232通信方式,注意控制线路尽量不要超过15m,如果要加长,必须随之降低通信波特率,在100m左右时,能够正常通信的波特率小于600bps。对于RS485通信,还必须考虑终端匹配电阻等。对于采用现场总线的高速控制系统,通信电缆必须采用专用电缆,并采用多点接地的方式,才能够提高可靠性。 以上就是干扰问题一些处理方法,希望能帮到楼主.也希望能帮到大家.
变频器是把工频电源(50Hz或60Hz)变换成各种频率的交流电源,以实现电机的变速运行的设备。其中控制电路完成对主电路的控制,整流电路将交流电变换成直流电,直流中间电路对整流电路的输出进行平滑滤波,逆变电路将直流电再逆变成交流电。对于如矢量控制变频器这种需要大量运算的变频器来说,有时还需要一个进行转矩计算的CPU以及一些相应的电路。
1. 整流器 ,它与单相或三相交流电源相连接,产生脉动的直流电压。
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QJ1DN91 New Mitsubishi PLC Devicenet Master Card
MITSUBISHI FR-A0E-.K-UL INVERTER DRIVE FREQROL -A00
MELSEC PROGRAMMABLE CONTROLLER A0JCPU, MELSEC A0J-EDT, MELSEC A0J-EDT
MITSUBISHI HCPQNKUE NSFP HCPQNKUE
Mitsubishi Transistor Unit FXN-0MT, Melsec, #1
MITSUBISHI FRA00KUL NSFP FRA00KUL
MITSUBISHI FR-K-100BM USPP FRK100BM
MITSUBISHI HF-MP USPP HFMP
Mitsubishi MELSEC AUSCPU with A1SJ1LP1 , A1SJ1UC-R and extral
Mitsubishi PLC AUSCPU , A1SJ1PT-S , A1SX1/Y1 , A1SJ1LP1 & A1SJ1UC-R
Mitsubishi AY1C, Used, AY1CMitsubishi, Fast
Mitsubishi FX0N-0MR-DS, Used, FX0N0MRDS, Fast
Mitsubishi FX0N-0MR-ES/UL, Used, FX0N0MRESUL, Fast
Mitsubishi FXN-ER-ES/UL, New, FXNERESUL, Fast
Mitsubishi AX0Y1CEU, Used, AX0Y1CEU, Fast
Mitsubishi AJ1QBT11, Used, AJ1QBT11, Fast
Mitsubishi A0J-ET, New, A0JET, Fast
Mitsubishi A0J-EDR, New, A0JEDR, Fast