[维修案例] 变频柜机室外交流电机烧坏的维修案例

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一、机器型号:

KFR-72LW/BP2DN1Y-YA400(B3)

二、故障现象:

原机室外变频电控坏,更换72室外变频通用板,运行几天后,用户保修外机风机不转,师傅上门检测,发现室外电机烧坏,然后申请原装电机更换,过两天,电机又烧了。

 三、检修过程

  • 步骤1:根据机型,BP2外机使用的是如下图的铁壳交流电机,主板直接继电器控制,运行电压交流220V,正常只有电压过高才会烧坏。

  • 步骤2:检测电机输入电压,220V正常,然后核对室外主板型号,用了17222000010228老外机通用电控盒,而YA400(B3)对应的是新外机,故障原因找到。
  • 步骤3:更换新外机的通用电控盒17222200001433,然后再申领一个原装的电机,一起配套更换后,故障问题解决。

四、故障原因分析

1、新旧外机交流电机插头对比:

由上图可以看出,新老外机风机端子的区别在于黑线和白线的位置刚好相反,红线位置不变,且对接端子也是一样的,不具备防呆功能,需要注意根据新老外机来选择相应的售后电控。其中红色线代表高风档线圈连接L线端,白色线代表低风挡线圈连接L线端,黑色线代表N线。

2、电机内部接线示意图:

不配套使用时工作模式,注意风机内部有一组辅助绕组,此绕组较短,阻抗小,若接错风机,则等效电路如下,可见LN间高压直接加到辅助绕组上,电流非常大,会把辅助绕组烧断,风机失效。

五、注意事项

我们72新老外机交流电机的插头接线是相反的,所以在维修是必须使用正确的通用电控盒或者转接线,否则用错会烧电机。


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