[变频空调维修]-第9章-模块故障-第2节-模块P/N端子击穿,室外机不运行

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空调培训资料缩略图

第2节 模块P/N端子击穿,室外机不运行

故障说明

海信KFR-2601GW/BP挂式交流变频空调器制冷开机,“电源、运行”灯亮,室内风机运行,但室外风机和压缩机均不运行,室内机指示灯显示故障代码内容为“通信故障”。使用万用表交流电压挡测量室内机接线端子上1号L和2号N端子电压为交流220V,说明室内机主板已输出交流电源,由于室外风机和压缩机均不工作,室内机又报出“通信故障”的故障代码,因此应检查室外机。

1.测量直流300V电压和室外机主板输入端电压

如图9-5左图所示,使用万用表直流电压挡测量直流300V电压,黑表笔接主滤波电容负极、红表笔接正极,正常值为直流300V,实测为直流0V,判断故障部位在室外机,可能为后级负载短路或前级供电电路出现故障。

如图9-5右图所示,向前级检查故障,使用万用表交流电压挡测量室外机主板输入端电压,正常为交流220V,实测说明室外机主板供电正常。

图9-5 测量直流300V和室外机主板输入端电压

图9-5 测量直流300V和室外机主板输入端电压

2.测量硅桥输入端电压

如图9-6左图所示,使用万用表交流电压挡测量硅桥的2个交流输入端子电压,正常为交流220V,而实测电压为交流0V,判断直流300V电压为0V的原因由硅桥输入端无交流电源引起。

如图9-6右图所示,室外机主板输入电压正常,但硅桥输入端电压为交流0V,而室外机主板输入端到硅桥的交流输入端只串接有PTC电阻,初步判断其出现开路故障,用手摸PTC电阻表面,感觉很烫,说明后级负载有短路故障。

图9-6 测量硅桥交流输入端电压和手摸PTC电阻

图9-6 测量硅桥交流输入端电压和手摸PTC电阻

3.断开模块P/N端子引线

引起PTC电阻发烫的原因主要是模块短路和开关管击穿。如图9-7所示,拔下模块P和N端子引线,再次上电开机,使用万用表直流电压挡测量直流300V电压已恢复正常,因此初步判断模块出现短路故障。

图9-7 断开模块P/N端子引线后测量直流300V电压

图9-7 断开模块P/N端子引线后测量直流300V电压

4.测量模块

如图9-8所示,使用万用表二极管挡,首先测量P、N端子,模块正常时应符合正向导通、反向无穷大的特性,但实测正向和反向均为58mV,说明模块P、N端子已短路。

图9-8 测量模块

图9-8 测量模块

说明:此处为使图片清晰,将模块拆下测量,实际维修时模块不用拆下,只需要将模块的P、N、U、V、W 5个端子引线拔下,即可测量。

维修措施

更换模块(见图9-9),再次上电开机,室外风机和压缩机均开始运行,空调器开始制冷,使用万用表直流电压挡测量直流300V电压已恢复正常。

图9-9 更换模块

图9-9 更换模块

总结

本例模块P、N端子击穿,使得室外机上电时因负载电流过大,PTC电阻过热,阻值变为无穷大,室外机无直流300V电压,室外机主板CPU不能工作,室内机CPU因接收不到通信信号,报出“通信故障”的故障代码。


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