Load Haul Dump Machine Electrical System Caterpillar


Heating and Air Conditioning

Usage:

R2900G NLK


图 1g06039294
加热器和空调电路

空调电路的部件是:风扇转速开关、温度控制开关、空调开关、继电器、风扇马达、节温器、电弧抑制器、保险丝、增压器风扇马达、制冷剂压力开关和压缩机离合器电磁阀。



图 2g06028282
驾驶室
(1) 空调开关
(2) 温度控制开关
(3) 风扇转速开关


图 3g06028284
空调装置的内部元件
(4) 继电器
(5) 风扇马达
(6) 节温器
(7) 电弧抑制器
(8) 保险丝


图 4g06028288
驾驶室右视图
(9) 增压器风扇马达


图 5g06028293
发动机右视图
(10) 制冷剂压力开关
(11) 压缩机离合器电磁阀

钥匙起动开关处于接通位置时,蓄电池通过断路器 6 向风扇转速开关 (3) 和继电器 (4) 提供 24 伏电源。

钥匙起动开关处于接通位置时,蓄电池通过断路器 6 提供 24 伏电源。 从断路器 6 经保险丝 (8) 和电弧抑制器 (7) 向增压器风扇马达 (9) 提供 24 伏电源。

风扇转速开关 (3) 是一个控制风扇马达 (5) 操作的五位开关。 风扇转速开关 (3) 转到一档、二档、三档或四档位置时,将会向风扇马达 (5) 和节温器 (6) 提供 24 伏电源。

温度控制开关 (2) 调节操作台内的温度。

节温器 (6) 防止系统过冷。 当出现过冷时,将会中断从节温器 (6) 输送到继电器 (4) 的 24 伏电源,导致压缩机离合器电磁阀 (11) 断电。

空调开关 (1) 将接通或断开空调。

空调开关 (1) 处于接通位置时,继电器 (4) 将通电,并将向制冷剂压力开关 (10) 提供 24 伏电源。 空调系统加注制冷剂后,制冷剂压力开关 (10) 将会闭合。 然后,将会提供 24 伏电源,以通电压缩机离合器电磁阀 (11),激活压缩机,导致制冷剂压力升高。

制冷剂压力高出制冷剂压力开关 (10) 的设定值后,制冷剂压力开关 (10) 将会断开,中断向压缩机离合器电磁阀 (11) 的供电。 此时压缩机停用,并且制冷剂压力将会缓慢下降。

制冷剂压力降到制冷剂压力开关 (10) 的正常设定值后,制冷剂压力开关 (10) 将会闭合,压缩机将会启动。

如果制冷剂压力降到正常工作压力以下,制冷剂压力开关 (10) 将会断开,中断向压缩机离合器电磁阀 (11) 的供电,压缩机将不工作。 在经过维修之前,系统将不会再次启用。

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