PM620, PM622, PM820, PM822 and PM825 Cold Planers Electronic System Caterpillar


Wiring Harness (Open Circuit) - Test

Usage:

PM825 3C6
断路是指使电流不流动的电路故障。 有故障的电线或连接不良的电气接头可能会导致开路。 电气导线或连接断开时,电路中的电流就会中断流动。 常闭电路的电阻值应小于 5 欧姆。 下述步骤将说明断路测试:

参考: 有关完整的电气示意图,参考正在维修的机器的电气系统示意图。

测试有无开路

  1. 确定可疑电路中的接头和导线编号。 使用机器的电气系统示意图检查电路。

  2. 将钥匙起动开关和断路开关转到断开位置。

  3. 从部件和 ECM 上断开机器线束。

  4. 在断开的机器线束接头处,从可疑导线的触点至机架接地之间放置一条跨接导线。

  5. 在另一个机器线束接头上,使用万用表测量可疑导线的触点与机架接地之间的电阻。

    预期结果:电阻小于 5 欧姆。

    确定 - 电阻小于 5 欧姆。 线束电路正常。

    停止。

    异常 - 电阻大于 5000 欧姆。 机器线束中存在断路。

    修理:修理或更换机器线束。

    停止。

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