ABBDCSAC700FCPU模块：CD722FAX721FABBDCSAC700FCPU模块：CD722FAX721FABBDCSAC700FCPU模块：CD722FAX721F在实际维修中变频器u、v、w三相输出不平衡可分为三种情况：(1)变频器显示器显示：(mis***gmotophase)输出缺相，如排除检测电路故障，则通过直接检查igbt模块和驱动电路，结论为igbt模块损坏，同时驱动电路也有问题。通过更换igbt模块和驱动电路上元器件如光耦，pnp，npn一对驱动晶体管，电解电容，稳压管等基本能解决问题。(2)变频器输出u、v、w之间相差100v左右，(输出380v为例)驱动电路中s1~s6中间的某一路驱动电路无驱动电压和驱动信号波形，通过测量输出端子u、v、w—p之间。(3)u、v、w—n之间直流电压，可找到这一路驱动电压不正常或没有驱动信号波形，它导致u、v、w中的某一相不能正常工作所引起相位差。解决办法为检查驱动电路电压是否正常，光耦是否坏了，电解电容是否漏液等。通过示波器测量6路波形符合技术要求，问题也就可解决了。还有另一种现象是变频器u、v、w三相输出交流电压之间相差大于3%，虽然能使用，但是不能长期使用和大负载使用。这主要是驱动电路s1~s6之间主要器件不对称所至，如晶体管的技术参数，稳压管的参数，电容的液枯，漏液和漏电等，6路驱动电路上器件的耗损使其参数上有一定的差别，导致变频器输出u、v、w之间产生微小的电位差。上述情况虽然能使用，但是技术上是不能容许的。我公司追求精益求精对各种器件通过筛选老化，如晶体管技术参数和稳压管技术参数一致、配对等，保证驱动电路中驱动信号符合技术要求，确保igbt模块饱和，导通时间上一致是由器件上的质量保证，修理好的变频器在做负载试验时，电动机运转中电动机声音轻盈，在修理前和修理后带相同功率电动机和相同功率负载，后者的电动机三相电流相对要小得多。P0923FQP0931GEP0931JDP0931KFP0931KJP0931NCP0931NDP0931NEP0931NFP0931NGP0931QRP0931QSP0931QVP0931QXP0931RMP0931RNP0931RPP0931RQP0931RRP0931RSP0931RTP0931RUP0931RVP0931URP0931USP0931UTP0940***P0940AWP0940AXP0940BAP0940BBP0940BRP0940BWP0940BYP0940CCP0940CDP0940CGP0940CTP0940CUP0940CVP0940CWP0940CXP0940CYP0940CZP0940DAP0940DHP0940DKP0940DRP0940FDP0940FPP0940FSP0940FTP0940FUP0940GAP0940GCP0940GDP0940GEP0940GFP0940GGP0940GHP0940GJP0940GKP0940GLP0940GMP0940GNP0940GPP0940GQP0940GRP0940GSP0940GVP0940GWP0940HAP0940HBP0940HCP0940HDP0940HEP0940HFP0940HGP0940HHP0940HJP0940HQP0940JDP0940JEP0940JFP0940JGP0940JHP0940JJP0940JKP0940JLP0940JMP0940JNP0940JPP0940JQP0940JRP0940JSP0940JTP0940JUP0940JVP0940JWP0940JXP0940KPP0940KSP0940LWP0940LYP0940MAP0940MBP0940MCP0940MDP0940MTP0940MUP0940MVP0940MWP0940MXP0940MYP0940MZP0940NBP0940NCP0940NDP0940NEP0940NFP0940NJP0940NNP0940NPP0940NQP0940NRP0940NSP0940NVP0940NXP0940NZP0940PAP0940PFP0940PMP0940PNP0940PQP0940PRP0940PSP0940PTP0940PUP0940PVP0950BMP0950BNP0950DAP0950DFP0951APP0951BAP0951BVP0951BXP0951BYP0951BZP0951CBP0951CCP0951CDP0951CEP0951CFP0951CHP0951CJP0951CKP0951CLP0951CMP0951CNP0951CPP0951CQP0951CRP0951CSP0951CTP0951CUP0951CVP0951CWP0951CXP0951CZP0951DAP0951DEP0951DFP0951DKP0951DLP0951DVP0951EFP0951EGP0951ELP0951EQP0951ESP0951ETP0951EWP0951FJP0951FKP0951FLP0951FMP0951FNP0951FPP0951GGP0951GPP0951GQP0951GRP0951GSP0951SDP0951SEP0951SFP0960AHP0960AWP0960GCP0960GXP0960HAP0960JAP0960KAP0960LFP0960MAP0960MKP0960NBP0961AAP0961BCP0961BDP0961BSP0961CAP0961CNP0961CPP0961DHP0961DKP0961DMP0961DNP0961DWP0961EFP0961EGP0961FRP0961FXP0970BCP0970BMP0970BPP0970BVP0970BWP0970BXP0970DCP0970DFP0970DGP0970EJP0970GWP0970HHP0970HSP0970HTP0970HVP0970HXP0970JAP0970JBP0970JDP0970JEP0970JGP0970JHP0970JJP0970JKP0970JLP0970JRP0970JWP0970JZP0970KEP0970KFP0970KGP0970KHP0970KJP0970KTP0970KUP0970KVP0970KWP0970LJP0970LKP0970LWP0970MMP0970MNP0970MUP0970MVP0970MYP0970MZP0970NGP0970NLP0970NMP0970NRP0970PAP0970PBP0970PCP0970PDP0970PEP0970PFP0970PJP0970PKP0970PLP0970PMP0970PNP0970PPP0970PQP0970PRP0970PSP0970PTP0970PUP0970PVP0970PXP0970PYP0970PZP0970QSP0970QTP0970QUP0970QVP0970QWP0970QXP0970QYP0970QZP0930HYP0930WGP0931DMP0931DT)