795F AC and 795F AC XQ Off-Highway Trucks Caterpillar


Ground Fault - Check

Usage:

795F AC ERM

------ DANGER! ------

在机器工作中和发动机停机后的短时间内,动力传动系电驱动系统中将包含危险电压水平。

在发动机运行中,不要拆下将使通电的高电压电气部件露出的任何盖板。

以下部件任何形式的保养只能在动力传动系电气系统维修断电程序完成后进行:

  • 变频器柜内的高电压腔室

  • 包含电驱动牵引马达的后桥壳体

  • 发电机

  • 减速电阻器栅极、栅极鼓风机马达和栅极系统电缆

  • 励磁磁场调节器

  • 高电压电缆和连接外壳

不遵从这些说明会造成人身伤亡。


  1. 准备维修的机器。 完成高压电气系统的断电和放电。 请参阅操作和保养手册, "使机器作好保养准备"。


    图 1g01872774

  2. 打开变频器柜上减速接触器腔室的盖 (1)。

  3. 将一条绝缘跨接导线接地凸台 (2) 连接 (DC) 正极母线条 3 (或) DC 负极母线条 4。

  4. 关闭减速接触器腔室盖。

  5. 停用发动机锁定控制装置。 关于更多信息,请参阅操作和保养手册, "发动机锁定控制装置"。

  6. 起动发动机,并让直流电源母线的电压升至 500 V 以上。

    注: 可以在 Advisor 屏幕上或者通过 ET 监视直流电源母线电压。

  7. 确认激活了 1 级警告接地故障事件。 消息 "DC Ground Fault(直流接地故障)"将出现在 Advisor 屏幕或 ET 上。

    注: 消息 "DC Ground Fault(直流接地故障)"需要大约 10 秒才能出现在 Advisor 屏幕上。

  8. 如果 1 级警告接地故障事件未激活,则执行接地故障诊断与排除程序。 关于更多信息,请参阅系统操作、故障诊断与排除、测试和调整, KENR8588 或联系您的 Caterpillar 代理商。

  9. 停止发动机。

  10. 执行传动系电气系统断电程序。

  11. 打开减速接触器腔室盖。

  12. 拆下跨接导线并关好检修门。

  13. 关闭减速接触器腔室盖。

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