Key Start Switch Test Description
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图 1 | g01276592 |
本测试测量钥匙起动开关两个极点两端的电压降。 测试点 (5) 和测试点 (6) 两端的电压降表示"开始"极点。 测试点 (5) 和测试点 (8) 两端的电压降表示"继电器"极点。
电压降将导致钥匙起动开关的指示灯点亮。 一个或两个极点的两端可能产生电压降。 电压降必须大于 2.50 ± 0.15 伏。 灯点亮是了为说明有缺陷。 所有测试步骤中的故障均会指示。
该故障可能的原因如下:
- 断开开关极点
- 带有过大电压降的闭合开关
- 带有焊结触点的开关的极点
注: 在三个测试中,钥匙开关开始位置开路。 三个测试为"测试设置 A,连接"、"测试步骤 C,起动辅助"和"测试步骤 D,高怠速"。 在这写步骤中钥匙开关指示灯点亮。 正确。
在"测试步骤 B,启动"中,取代钥匙起动开关的钥匙启动开关按钮可能导致故障。 使用空档起动开关直接驱动机器,以禁止发动机起动。
禁止发动机 (N) 起动的开关通常安装在测试点 5 和测试点 6 之间。
此测试中也检查导线线束及导线线束接头。 有关部件的位置,请参阅正在维护机器的导线示意图。 线束中的开路将指示故障。
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