机监控与保护由电路的机引擎控制器，控制器,转速传感器，机油压力传感器，水温传感器，继电器J1、KT1、KAI、KA2、KA6，故障喇叭HA，预报警灯HLL，报警灯HL2，充电失败指示灯等完成。(1)监测电路 在起动完成并进入运行期间，将转速传感器、机油压力传感器(油压1)、水温传感器(水温1)及蓄电池送来的信号，处理后显示。充电机正常工作运行时，充电失败指示灯的两端因无电位差而熄灭，表明充电机工作运行正常，否则将点亮。(2)保护电路1)当系统得电进入起动操作时，对机组参数的检测与保护会根据事前设定的延时进行，以避开机起动过程的误检与误保护。2)当水温高时，检测到水温传感器的阻抗减小达到预报警阈值时，使预报警端子8变为低电平，KA1得电，其触点接通，故障预报警灯HL1亮，但并不关机，报警设定阈值可设置为98℃；当T-P检测到水温升高到设定的报警值时，使报警端子17变为低电平，KA2得电，其触点接通，报警灯HL2亮，电喇叭HA响，T-P同时进入停机程序，关闭机并将故障记忆，多功能报警表上显示“TEMP”字样。3)当机的机油压力低时，T-P检测到机油压力传感器的阻抗减小达到报警值后，T-P使预警报警端子8和17变为低电平，KA1、KA2得电，此时故障预警灯HL1及故障报警灯HL2亮，电喇叭HA响，T-P同时进入停机程序，关闭机。并将故障记忆，多功能报警表上显示“OIL”字样。4)当蓄电池电压过高或过低时通过端子3检测后也会发出预报警信号(使T-P端子8产生低电位)，故障预报警灯HL1亮，但并不关机，多功能报警表显示“HVOLT”或“LVOLT”但不停机。5)当机转速过高时，T-P检测到转速传感器输入到端子10的脉冲频率过高，T-P使预警报警端子8和17变为低电平，接通报警电路，此时故障预警灯HL1及故障报警灯HL2亮，电喇叭HA响，T-P同时进入停机程序，关闭机。并将故障记忆，多功能报警表上显示“OR—EV”字样。超速保护阈值可设置为1650r/min。
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