[变频空调维修]-第12章-跳闸故障-第2节-连接线之间绝缘下降,上电空气开关跳闸

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第2节 连接线之间绝缘下降,上电空气开关跳闸

故障说明

海信KFR-50LW/BP柜式交流变频空调器只要通上电源,即使不开机,空气开关也断开保护。

1.上电后空气开关跳闸

如图12-8所示,观察空气开关带有漏电保护功能,只要将空调器通上电源,空气开关即跳闸。

图12-8 空气开关跳闸

图12-8 空气开关跳闸

2.断开室内外机连接线

使用万用表电阻挡测量电源插头上N线与地线阻值约为20kΩ,初步判断空调器有漏电故障。

如图12-9左图所示,取下室内机外壳及电控盒接线盖,使用螺丝刀取下室内外机连接线,这样就断开了室外机电控部分和连接线。空调器上电时只给室内机电控部分供电,此时空气开关不再跳闸,使用遥控器开机室内风机运行,判断故障在室外机电控部分。拆开室外机外壳,测量容易出现故障的硅桥、模块等元器件均正常,试代换室外机主板,故障仍未排除。

如图12-9右图所示,为判断故障原因,在室内机接线端子上恢复室外机连接线,在室外机接线端子处断开室外机供电,并将接头使用绝缘胶布包好(防止交流220V上电后对地漏电),这样空调器上电后只给室内机电控部分和连接线供电,此时空气开关仍旧跳闸,由于室内机电控部分正常,应重点检查连接线阻值。

图12-9 断开室内外机连接线

图12-9 断开室内外机连接线

3.测量连接线阻值

如图12-10所示,使用万用表电阻挡测量连接线之间阻值,结果见表12-1。由结果可知,连接线出现漏电故障。

图12-10 测量线与线之间阻值

图12-10 测量线与线之间阻值

注:接线端子上1号为室外机供电L相线,2号为室外机供电N零线,3号为地线,4号为室内机主板和室外机主板的通信线SI。

表12-1 测量连接线之间阻值

表12-1 测量连接线之间阻值

4.查看连接线

如图12-11所示,此机室内机和室外机距离较远,加长约4m管线,此机又使用有10年左右时间,而加长线一般质量较差,因此重点检查加长连接线。

图12-11 加长连接线及接头

图12-11 加长连接线及接头

如图12-12所示,仔细查看连接线接头,发现连接线绝缘层已经严重破损,有些已露出内部的铜线,判断是加长连接线绝缘下降而引起的故障。

图12-12 加长连接线绝缘层严重破损

图12-12 加长连接线绝缘层严重破损

维修措施

如图12-13所示,更换加长4m连接线,将接头使用防水胶布缠好,恢复线路后上电试机,空气开关不再跳闸,遥控开机后室内机和室外机均开始运行,制冷恢复正常。

图12-13 更换加长连接线

图12-13 更换加长连接线

总结

此机安装时加长管线约4m,而加长的连接线一般质量较差,在使用几年之后绝缘下降,通常引起上电或开机后空气开关跳闸、连接线接头由于发热导致烧断等故障,在维修时需要仔细检查。


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