[变频空调维修]-第11章-室外机运行不正常故障-第2节-电压检测电路中电阻开路,室外机不运行

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空调培训资料缩略图

第2节 电压检测电路中电阻开路,室外机不运行

故障说明

海信KFR-26GW/18BP挂式交流变频空调器遥控开机后,室外风机运行,模块板上3个指示灯同时闪,表示无任何限频因素,待压缩机运行约5s后,室外风机和压缩机均停机。如图11-9所示,模块板上指示灯报故障代码为LED01和LED02灯亮、LED03灯闪,查故障代码含义为“过/欠压故障”。

图11-9 故障代码为“过/欠压故障”

图11-9 故障代码为“过/欠压故障”

1.电压检测电路工作原理

图11-10所示为室外机电压检测电路原理图。图11-11所示为实物信号流程。本机电压检测电路检测直流300V电压,由CPU引脚计算,通过检测直流电压达到检测输入交流电压的目的。电路由检测电阻R104、R105,分压电阻R109,钳位二极管D172,电容C341,电阻R44组成。R104和R105为上分压电阻,R109为下分压电阻,在中点形成与直流300V成比例的电压,经R44送至CPU,由CPU通过引脚电压计算出直流300V实际电压值,从而计算出交流输入电压值,D172钳位二极管防止CPU输入电压过高。

CPU引脚正常电压为直流2~3V。

图11-10 海信KFR-26GW/18BP室外机电压检测电路原理图

图11-10 海信KFR-26GW/18BP室外机电压检测电路原理图

图11-11 电压检测电路工作流程

图11-11 电压检测电路工作流程

2.测量电压检测电路电压

如图11-12所示,使用万用表直流电压挡,黑表笔接接线端子N,红表笔接R104上端(①处)即P端子,正常电压应为直流300V,实测电压为直流309V,说明交流220V经硅桥整流后的直流电压正常。

红表笔接R104下端(②处)即R105上端电压,实测电压为直流164V。

红表笔接R105下端(③处)即R105和R109分压点电压,实测电压为直流5.6V,正常电压约3V,判断分压电路出现故障。

红表笔接R44下端(④处)即CPU引脚电压,实测电压为直流5.6V,和分压点电压相等,说明电阻R44阻值正常。

图11-12 测量电压检测电路电压

图11-12 测量电压检测电路电压

3.测量分压电路电阻阻值

如图11-13所示,断开空调器电源,待室外机主板开关电源停止工作后,使用万用表电阻挡测量分压电阻阻值,实测R104和R105阻值均为220kΩ,说明上分压电阻阻值正常,测量下分压电阻R109时阻值为无穷大,其参数为4701,正常阻值为4.7kΩ,判断R109开路损坏。

图11-13 测量电压检测电路电阻阻值

图11-13 测量电压检测电路电阻阻值

维修措施

如图11-14所示,代换贴片电阻R109。原电阻使用贴片电阻,规格4701,说明阻值为4.7kΩ,由于无相同规格的贴片电阻更换,使用相同阻值的普通四环电阻代换。

更换后再次将空调器通上电源,遥控开机后压缩机和室外风机均开始运行,制冷正常,故障排除。使用万用表直流电压挡测量电压检测电路电压如图11-15所示。

图11-14 使用4.7kΩ普通四环电阻更换贴片电阻

图11-14 使用4.7kΩ普通四环电阻更换贴片电阻

图11-15 测量正常的电压检测电路电压

图11-15 测量正常的电压检测电路电压


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