[变频空调维修]-第6章-通信故障-第12节-加长连接线接头氧化,室外机不运行

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空调培训资料缩略图

第12节 加长连接线接头氧化,室外机不运行

故障说明

海信KFR-26GW/27BP挂式交流变频空调器不制冷,用遥控器开机后室外风机和压缩机均不运行。

1.测量接线端子电压

如图6-75左图所示,使用遥控器开机,室内机主板向室外机供电后,使用万用表直流电压挡,黑表笔接室内机接线端子2号N零线,红表笔接4号通信SI线,测量通信电压,正常值为直流0V—24V跳动变化的电压,实测为直流15V—24V跳动变化的电压。

如图6-75右图所示,到室外机接线端子处测量通信电压时,实测为-10V—(-4V)跳动变化的直流电压,判断通信电路存在故障。

图6-75 测量室内机接线端子和室外机接线端子通信电压

图6-75 测量室内机接线端子和室外机接线端子通信电压

2.测量室内机接收光耦电压

如图6-76所示,由于室内机接线端子通信电压在15V—24V跳变,为判断室内机CPU是否接收到通信信号,使用万用表直流电压挡,首先测量接收光耦PC2次级侧电压为直流5V,正常值为0V—5V跳动变化的电压,说明接收光耦未将通信信号送至室内机CPU;测量PC2初级侧电压,正常为0V—1.1V跳动变化的直流电压,实测电压为0V,说明通信信号未送至接收光耦初级侧引脚,确定通信回路存在故障。

图6-76 测量室内机主板接收光耦初级和次级电压

图6-76 测量室内机主板接收光耦初级和次级电压

3.待机状态测量通信电压

如图6-77左图所示,拔下空调器电源等待约2min,使室内机主板和室外机主板上的电压均完全释放,再将空调器通上电源,但不开机即处于待机状态,测量室内机接线端子电压为直流24V,说明室内机主板通信电压产生电路正常。

如图6-77右图所示,测量室外机接线端子电压为直流10V,正常时应和室内机接线端子电压相同,为直流24V。在室外机接线端子上端取下通信线,电压仍为直流10V,排除室外机主板通信电路漏电故障,应检查室内外机连接线。

图6-77 待机状态测量室内机和室外机接线端子通信电压

图6-77 待机状态测量室内机和室外机接线端子通信电压

4.检查室内外机连接线

如图6-78所示,此机室外机距室内机位置较远,中部加长了约2m管线,首先检查连接线接头,剥开包扎带后,发现2号N零线接头严重氧化,用手一摸接头便断开为两截了。原因为原配引线较粗,而加长引线使用护套线且线径较细(非标1.5mm2电源线),由于运行时电流较大,连接线发热变黑,又由于护套线本身并不防水,在室外使用时受雨水和露水的侵袭,连接线接头逐渐严重氧化,因而内阻变大,电源N零线又为通信电路提供回路,N线接头氧化相当于串联了一个阻值较大的电阻,在接线端子测量通信电压时室内机为直流24V,室外机为直流10V左右。

图6-78 加长连接线中电源零线接头严重氧化

图6-78 加长连接线中电源零线接头严重氧化

应急措施

如图6-79左图所示,找3段引线更换连接线中1号L相线、2号N零线、4号通信SI线,地线不用更换,将空调器通上电源但不开机即处于待机状态下,测量室外机接线端子通信电压为直流24V,和室内机接线端子通信电压相等。遥控开机,室内机主板向室外机供电后,压缩机和室外风机均开始运行,制冷恢复正常。

图6-79 更换3段引线

图6-79 更换3段引线

维修措施

如图6-79右图所示,将加长引线更换为质量较好的黑色绝缘线,以防止类似故障再次发生。


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