[变频空调维修]-第9章-模块故障-第3节-PFC模块中硅桥击穿,室外机不运行

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第3节 PFC模块中硅桥击穿,室外机不运行

故障说明

海信KFR-35GW/08FZBPC-3挂式直流变频空调器,用户反映不制冷。遥控开机后,室内风机运行,但室外机不运行,一段时间以后,按压遥控器上“高效”键4次,显示屏显示故障代码为“36”,含义为“通信故障”。

1.测量直流300V电压

如图9-10所示,由于室外机不运行,因此先到室外机检查。取下室外机上盖,使用万用表直流电压挡,黑表笔接模块N端子,红表笔接模块P端子,测量直流300V电压,实测电压为直流0V,说明交流220V强电通路有开路或直流300V负载有短路故障。使用万用表交流电压挡,黑表笔接电源N端子,红表笔接主控继电器后端触点,正常电压为交流220V,实测电压为交流0V,测量前端触点电压为交流220V,初步判断PTC电阻出现开路故障。用手摸PTC电阻表面发烫,说明后级负载有短路故障。

图9-10 测量直流300V电压和手摸PTC电阻发烫

图9-10 测量直流300V电压和手摸PTC电阻发烫

2.本机硅桥与模块板简介

如图9-11所示,本机未使用常见形式的硅桥,而是使用PFC模块,将硅桥和PFC电路集成在一个模块内,和变频模块做在同一块电路板上。

图9-11 模块板正面与背面

图9-11 模块板正面与背面

如图9-12所示,模块板正面共有10个接线端子。变频模块引脚有4个,分别为P、U、V、W端子。硅桥引脚4个,为2个交流输入端(AC-N-IN、AC-L-IN)和2个直流输出端(N为直流负极、L1为直流正极)。PFC引脚2个,L2为输入端、CAP+为输出端。

说明:硅桥直流负极经水泥电阻直接连至模块N引脚,因此未设模块N端子。

图9-12 模块板正面10个端子功能

图9-12 模块板正面10个端子功能

3.测量模块引脚

如图9-13所示,检查容易出现击穿故障的模块引脚,使用万用表二极管挡,黑表笔接N即硅桥负极引脚,红表笔接P端子,结果为751mV;红表笔改接U/V/W端子,结果均为419mV,初步判断模块正常。测量N与U/V/W端子的正反向结果,及U/V/W端子之间均符合要求,没有出现短路数值,判断模块正常。

图9-13 测量模块端子

图9-13 测量模块端子

4.测量硅桥引脚

如图9-14所示,使用万用表二极管挡测量硅桥引脚,黑表笔接负极N,红表笔接2个交流输入端AC-L和AC-N,正常时应为正向导通,而实测结果均为0mV。

图9-14 测量硅桥端子

图9-14 测量硅桥端子

如图9-15所示,表笔接2个交流输入端,正常时应为无穷大,而实测结果为0mV;将黑表笔接负极N,红表笔接正极输出L1,相当于测量2个串联的二极管,正常结果通常在700mV以上,而实测仅为470mV。综合以上3次测量结果,可以判断PFC模块内硅桥中至少有2个二极管击穿。

图9-15 测量硅桥端子

图9-15 测量硅桥端子

维修措施

由于硅桥集成在PFC模块内部,且PFC模块不能更换,因此在实际维修时更换模块板,新更换的模块板实物外观如图9-16所示。原模块板上变频模块使用三菱系列,新更换的模块板使用仙童系列。

图9-16 更换模块

图9-16 更换模块


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