ABBDCSAC700FCPU模块：DA701FDC732FABBDCSAC700FCPU模块：DA701FDC732FABBDCSAC700FCPU模块：DA701FDC732F在变频器维修的过程中经常能够看到电源变压器出毛病其主要原因为内部短路.这时可通过万用表检查电源电压来判断其是否正常.输出变压器绝缘性能下降或有匝间局部短路现象时,将使电流激增,开关电源输出电压下降.因此,可通过测量电源电压来判断输出变压器是否短路.1.通过观察变压器的外貌来检查其是否有明显异常现象.如线圈引线是否断裂、脱落,绝缘材料是否有烧焦痕迹,铁芯紧固螺杆是否有松动,硅钢片有无锈蚀,绕组线圈是否外露等.2.绝缘性能测试.用万用表R*10K挡分别测量铁芯与初级,初级与各次级,铁芯与各次级,静电屏蔽层与各次级,次级各绕组间的电阻值,万用表指针均应指在无穷大位置不动.否则,说明变压器绝缘性能不良.3.线圈通断的检测.将万用表置于R*1挡,测试中,若某个绕组的电阻值为无穷大,则说明此绕组有断路性故障.4.判别初、次级线圈.电源变压器初级引脚和次级引脚一般都是分别从两侧引出的,并且初级绕组多标有220V字样,次级绕组则标出额定电压值,如15V、24V、35V等.可根据这些标记进行识别.工业现场信号传输干扰处理参考方案(变频器抗EMC干扰专用隔离放大器)：工业现场有变频控制设备、大功率电磁起动设备、GPS高频信号无线收发装置等存在EMC干扰源的系统，需要针对不同的干扰源及系统控制信号的特性来分析确定干扰信号处理解决方案。1、传感器输出模拟信号上的干扰在传感器输出端加装ISO系列模拟信号隔离放大器可以有效解决模拟信号传输过程中的衰减和EMC干扰，增强显示控制系统的稳定性和可靠性。用于变频器抗EMC干扰的模拟信号隔离放大器：ISOEMU-P-O-M系列，是在IC内部加装输入信号干扰抑制滤波电路和输出干扰谐波吸收电路，增强抗EMC电磁干扰和高频信号空间干扰功能。特别适用于现场有变频控制设备、大功率电磁起动、GPS高频信号无线收发装置的场合。2、高频信号辐射的空间干扰将各控制系统、设备分别加装金属屏蔽盒(不同频率段使用的金属成分不同)并将外壳可靠接地，信号通讯传输线路采用双绞屏蔽电缆。3、RS232/RS485的远程通讯线路干扰在RS232/RS485通讯接口上加装DC-DC隔离模块电源，将通讯供电电源与其它电源直接隔离开来。信号通讯传输线路也要采用双绞屏蔽电缆(屏蔽层接地)。4、系统供电电源电路中的干扰现场有大电流晶闸管、变频控制设备、大功率电磁起动装置的，对电源系统的供电参数会产生畸变影响。通过电源电路，干扰信号会进入到现场的各个控制装置。因此，首先要确定现场的各个装置接地良好，各装置的供电电源要加装与其相匹配的电源滤波器(低通EMI滤波器或抑制电抗器)。模拟信号隔离放大器隔离变送器的带宽与频响工业现场技术指标选型应用参考：1、模拟信号在变化频率缓慢(<50Hz)的场合(如测量温度、压力、位移、流量等)，可选用带宽较小、低频响的隔离放大器：ISOEMU(A)-P-O-M系列产品(M：表示低频响)。所以在变频器控制系统中，为抑制和隔离EMC干扰，常选用：ISOEMU-P-O-M系列的隔离放大器。2、模拟信号在变化频率高(>2KHz)的场合(如测量转速、调节高速电子开关、开关电源的PWM控制等)，为保障采集数据的完整和可靠，常选用高带宽、高低频响的隔离放大器：ISOEMU(A)-P-O-H系列产品(H：表示高频响)。3、高频与低频响环境以外的大多数系统都选择常规频响(2K)产品：ISOEMA-P-O或ISOEMU-P-O系列。4、对现场环境有强磁空间干扰(高频电磁大电流负载)场合可选用光电隔离放大器：ISOU(A)-P-O-M系列。P0997FWP0997FXP0997FYP0997JAP0997JBP0997JCP0997JDP0997JEP0997JFP0997JGP0997JHP0997JJP0997JKP0997JLP0997JMP0997JNP0997JPP0997JQP0997JRP0997JSP0997JTP0997JUP0997JVP0997JWP0997JXP0997JYP0997JZP0997KAP0997KBP0997KCP0997KDP0997KEP0997LAP0997LBP0997LCP0997LDP0997LEP0997LFP0997LGP0997LHP0997LJP0997LKP0997LLP0997LMP0997LNP0997LPP0997LQP0997LRP0997LSP0997LTP0997LUP0997LVP0997LWP0997LXP0997LYP0997LZP0997MAP0997MBP0997MCP0997MDP0997MEP0997MFP0997MGP0997MHP0997MJP0997MKP0997MMP0997MNP0997MPP0997MQP0997MRP0997MSP0997MTP0997MUP0997MVP0997MXP0997MYP0997MZP0997NAP0997NBP0997NCP0997NDP0997NEP0997NFP0997NGP0997NHP0997NJP0997NKP0997NLP0997NMP0997NNP0997NPP0997NQP0997NRP0997NSP0997NTP0997NUP0997NVP0997NWP0997NXP0997NYP0997NZP0997PAP0997PBP0997PCP0997PDP0997PEP0997PFP0997PGP0997PHP0997PJP0997PKP0997PLP0997PMP0997PNP0997PPP0997PQP0997PRP0997PSP0997PTP0997PUP0997PVP0997PWP0997PXP0997PYP0997PZP0997QAP0997QBP0997QCP0997QDP0997QEP0997QFP0997QGP0997QHP0997QJP0997QKP0997QLP0997QMP0997QNP0997QPP0997QQP0997QRP0997QSP0997QTP0997QUP0997QVP0997QWP0997QXP0997QYP0997QZP0997RAP0997RBP0997RCP0997RDP0997REP0997RFP0997RGP0997RHP0997RJP0997RKP0997RLP0997RMP0997RNP0997RPP0997RQP0997RRP0997RSP0997RTP0997RUP0997RVP0997RWP0997RXP0997RYP0997RZP0997SAP0997SBP0997SCP0997SDP0997SEP0997SFP0997SGP0997SHP0997SJP0997SKP0997SLP0997SMP0997SNP0997SPP0997SQP0997SRP0997SSP0997STP0997SUP0997SVP0997SWP0997SXP0997SYP0997SZP0997TAP0997TBP0997TCP0997TDP0997TEP0997TFP0997TGP0997THP0997TJP0997TKP0997TLP0997TMP0997TNP0997TPP0997TQP0997TRP0997TSP0997TTP0997TUP0997TVP0997TWP0997TXP0997TYP0997TZP0997UAP0997UBP0997UCP0997UDP0997UEP0997UFP0997UGP0997UHP0997UJP0997UKP0997ULP0997UMP0997UNP0997UPP0997UQP0997URP0997USP0997UTP0997UUP0997UVP0997UWP0997VAP0997VBP0997VCP0997VDP0997VEP0997VFP0997VGP0997VHP0997VJP0997VKP0997VLP0997VMP0997VNP0997VPP0997VQP0997VRP0997VSP0997VTP0998AAP0998ABP0998ACP0998ADP0998AEP0998AFP0998AGP0998AHP0998AJP0998AKP0998ALP0998AMP0998ANP0998APP0998AQP0998ARP0998ASP0998ATP0998AUP0998AVP0998AWP0998AXP0998AYP0998AZP0998BAP0998BBP0998BCP0998BDP0998BEP0998BFP0998BGP0998BHP0998BJP0998BKP0998BLP0998BMP0998BNP0998BPP0998BQP0998BRP0998BSP0998BTP0998BUP0998BVP0998BWP0998BXP0998BYP0998BZP0998CAP0998CBP0998CCP0998CDP0998CEP0998CFP0998CGP0998CHP0998CJP0998CKP0998CLP0998CMP0998CNP0998CPP0998CQP0998CRP0998CSP0998CTP0998CUP0998CVP0998CWP0998CXP0998CYP0998DAP0998DBP0998DCP0998DDP0998DEP0998DFP0998DGP0998DHP0998DKP0998DLP0998DMP0998DNP0999AAP0999ABP0999ACP0999ADP0999AEP0999AFP0999AGP0999AHP0999AJP0999AK)