Alternator Test Description
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图 1 | g01287589 |
本测试测量交流发电机输出的电压降。 测量测试点 (9) 和测试点 (7) 两端的电压降。 测试点 (9) 为正极触点而测试点 (7) 为负极触点。
如果电压小于 26.2 ± 0.15 伏,两个测试点之间的电压测量值使交流发电机指示灯保持关闭。 最少两分钟后该灯关闭以指示存在故障。 故障指示交流发电机电量不足。
故障可能由下列情况引起:
- 松开风扇上的带子
- 松开交流发电机上的带子
- 从起动马达连接至发动机体的接地电缆损坏、松动或缺少。
- 交流发电机出故障
- 蓄电池出故障
如果电压测量值大于 28.9 ± 0.15 伏,两个测试点之间的电压测量值使交流发电机指示灯保持关闭。 该灯点亮一分钟,然后熄灭,以指示存在故障。 故障指示交流发电机充电过足。
故障可能由下列情况引起:
- 交流发马达
有故障的交流发电机使灯点亮。 然后,当所有电气载荷均开启时,该灯关闭。 报警灯仍然不亮。
在这种情况下,使用安培表确认交流发电机正确的输出电流。 为了纠正交流发电机输出,请参阅本测试中机器的维修手册。
当交流发电机严重充电过足时,分析仪将关闭至安全模式。 当分析仪的所有指示灯均关闭时,说明处于安全模式。
可确定为充电过足。 缓慢降低发动机转速到怠速。 分析仪开启。 交流发电机指示灯关闭。 测试灯随后点亮。 确定为充电过足。 如果在蓄电池盒内发现了少量水,则可确定为充电过足。
Caterpillar Information System:
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