[变频空调维修]-第6章-通信故障-第10节-室外机通信电路稳压管漏电,室外机运行15min停机

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第10节 室外机通信电路稳压管漏电,室外机运行15min停机

故障说明

海信KFR-26GW/27FZBPC挂式直流变频空调器遥控开机后室外机运行,空调器开始制冷,但室内机显示屏不能显示室外环温,室外机运行约15min后停机,且不再启动。按压遥控器上“高效”键4次,显示屏显示代码为“36”,含义为“通信故障”。室外机通信电路原理图参见图6-52。

1.测量室外机接线端子通信电压

遥控开机后,在室外机运行时,首先使用万用表交流电压挡,测量室外机接线端子上1号L相线和2号N零线电压为交流220V,说明室内机主板已输出供电;将万用表挡位换用直流电压挡,如图6-60左图所示,黑表笔接2号N零线端子,红表笔接4号通信SI端子,实测为0V—18V跳动变化的直流电压,低于正常值的0V—24V跳变电压。取下室外机外壳,测量室外机主板和模块板上直流300V、15V、12V、5V电压均正常。

如图6-60右图所示,拔下空调器电源插头,待3min后重新将插头插上电源但不开机,使空调器处于待机状态,再使用万用表直流电压挡测量室外机接线端子上通信电压,实测为直流18V,而正常为稳定的直流24V,初步判断通信电路有漏电故障。为判断故障,在室外机接线端子处断开4号通信SI线,再测量通信电压已变为直流24V,判断室外机通信电路有漏电故障。

图6-60 测量室外机接线端子通信电压和断开通信线后测量通信电压

图6-60 测量室外机接线端子通信电压和断开通信线后测量通信电压

2.测量室外机主板通信电路电压

如图6-61所示,恢复室外机接线端子上通信SI线,在空调器处于待机状态时,使用万用表直流电压挡,黑表笔接室外机主板上通信电路N零线,红表笔首先接通信线(①处),电压为直流18.4V,和室外机接线端子电压相等。

图6-61 测量室外机主板通信电路电压

图6-61 测量室外机主板通信电路电压

红表笔接分压电阻R24上端(②处),实测为直流17.4V,和①处电压基本相等,说明PTC电阻TH01阻值正常。

红表笔接二极管D05正极(③处,即分压电阻R24下端),实测为直流12.7V,低于②处电压较多,由于室外机通信电路有漏电故障,也说明R24阻值正常(断电后实测R24阻值为正常值4.7kΩ)。

红表笔接发送光耦PC01次级侧集电极引脚(④处),实测为直流12.1V,低于③处电压约0.6V,说明二极管D05正常。

3.在路测量电容阻值

如图6-62所示,断开空调器电源,待到室外机主板直流300V电压下降至0V时,使用万用表电阻挡测量通信电路中电容C31、C15、C14引脚阻值,实测C31、C15引脚阻值接近无穷大,C14引脚阻值约为12kΩ,判断电容C14漏电损坏。

图6-62 在路测量电容阻值

图6-62 在路测量电容阻值

4.单独测量C14电容和断开稳压二极管

如图6-63左图所示,为准确判断,将C14电容焊下,使用万用表电阻挡单独测量,实测结果为无穷大,说明电容无漏电故障。

如图6-63右图所示,查看主板上C14与30V稳压二极管ZD01并联,试将ZD01焊开一个引脚,再将空调器通上电源但不开机,即处于待机状态时,使用万用表直流电压挡测量室外机接线端子通信电压为稳定的直流24V,说明稳压二极管出现漏电故障。

图6-63 单独测量C14阻值和断开稳压二极管引脚

图6-63 单独测量C14阻值和断开稳压二极管引脚

5.测量损坏和正常的稳压二极管

如图6-64和图6-65所示,将稳压二极管ZD01从室外机主板上拆下,使用万用表电阻挡正反两次测量,实测阻值为12.7kΩ、12MΩ,而相同稳压功能的二极管使用万用表电阻挡测量时,两次结果均为无穷大,可以说明二极管漏电损坏;使用万用表二极管挡测量时,损坏的稳压二极管正向为419mV,而正常的稳压二极管为642mV,反向均为无穷大,综合判断稳压二极管漏电损坏。

图6-64 电阻挡和二极管挡测量稳压二极管

图6-64 电阻挡和二极管挡测量稳压二极管

图6-65 电阻挡和二极管挡测量正常的稳压二极管

图6-65 电阻挡和二极管挡测量正常的稳压二极管

维修措施

更换稳压二极管(见图6-66),原型号为MCC 1N5930B,代替型号为30B2,稳压值均为30V。

图6-66 更换室外机主板稳压二极管

图6-66 更换室外机主板稳压二极管

更换后将空调器处于待机状态(即通上电源但不开机),使用万用表直流电压挡测量室外机接线端子通信电压为稳定的直流23.5V,如图6-67所示。

图6-67 测量室外机主板通信电路电压

图6-67 测量室外机主板通信电路电压


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