[变频空调维修]-第9章-模块故障-第1节-模块P/U端子击穿,报模块故障

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第1节 模块P/U端子击穿,报模块故障

故障说明

海信KFR-28GW/39MBP挂式交流变频空调器遥控开机后室外风机运行,但压缩机不运行,空调器不制冷。

1.查看故障代码

如图9-1所示,遥控开机后室外风机运行,但压缩机不运行,室外机主板直流12V电压指示灯点亮,说明开关电源已正常工作,模块板上以LED1和LED3灭、LED2闪的方式报故障代码,查看代码含义为“模块故障”。

图9-1 压缩机不运行和模块板报故障代码

图9-1 压缩机不运行和模块板报故障代码

2.测量直流300V电压

如图9-2所示,使用万用表直流电压挡测量室外机主板上滤波电容的直流300V电压,实测为直流297V,说明电压正常。由于代码为“模块故障”,应拔下模块板上的P、N、U、V、W 5根引线,使用万用表二极管挡测量模块。

图9-2 测量直流300V电压和拔下5根引线

图9-2 测量直流300V电压和拔下5根引线

3.测量模块

如图9-3所示,使用万用表二极管挡,测量模块的P、N、U、V、W 5个端子,测量结果见表9-1,在路测量模块的P和U端子,正向和反向测量均为0mV,判断模块P与U端子击穿;取下模块,单独测量P与U端子正向和反向均为0mV,确定模块击穿损坏。

图9-3 测量模块P和U端子击穿

图9-3 测量模块P和U端子击穿

表9-1 测量模块

表9-1 测量模块

维修措施

如图9-4所示,更换模块板。

图9-4 更换模块板

图9-4 更换模块板

总结

①本例模块P和U端子击穿,在待机状态下由于P、N未构成短路,因而直流300V电压正常,而遥控开机后室外机CPU驱动模块时,立即检测到模块故障,瞬间就会停止驱动模块,并报出“模块故障”的代码。

②如果为早期模块,同样为P和U端子击穿,则直流300V电压可能会下降至260V左右,出现室外风机运行、压缩机不运行的故障。

③如果模块为P和N端子击穿,相当于直流300V短路,则室内机主板向室外机供电后,室外机直流300V电压为0V,PTC电阻发烫,室外风机和压缩机均不运行。


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