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FANUC i 系列维修讲义....................................................................................1 一 、数控机床的基本结构.............................................................................4

1-1.数控机床的命名................................................................................................................4 1-2. 数控机床机械结构及特点..............................................................................................6 1-3．数控机床控制方式.........................................................................................................7 1-4. 数控系统的组成..............................................................................................................8 1-5. 数控系统的软件分类：................................................................................................11

二、FANUC i系列数控系统的连接（18i）..................................................12

2-1.系统的组成......................................................................................................................12 2-2. i系列数控系统连接框图...............................................................................................17 2-3. 外围电路及主要接口信号............................................................................................19 2-4. RS232C外围输入输出设备的连接.............................................................................21 2-5. 高速跳过信号................................................................................................................23 2-6. 主轴信号........................................................................................................................24 2-7. 数字伺服的连接............................................................................................................28 2-8. FANUC I/O LINK........................................................................................................36

三、数控机床故障诊断步骤.........................................................................40

3-1．接口电路的诊断——数控系统的诊断画面...............................................................40 3-2．机床返回参考点方式（增量、绝对）.......................................................................53 3-3．绝对位置检测时的零点设置.......................................................................................55 3-4 实际解决不能自动运行的故障.....................................................................................56 3-5．PMC辅助手段——TRACER和FORCE的使用说明............................................63

四．伺服参数的设置...................................................................................69

4-1. 数字伺服框图及工作原理............................................................................................69 4-2. 与数字伺服相关的参数................................................................................................71 4-3. 数字伺服画面调用........................................................................................................75 4-4 数字伺服参数的初始化设置.........................................................................................77

五．伺服报警与故障处理............................................................................84

5-1伺服的基本连接和电压规格..........................................................................................84 5-2报警显示（CRT/LCD报警内容）................................................................................86 5-3电源单元状态灯说明......................................................................................................90 5-4电源单元七段显示管报警..............................................................................................92 5-5 伺服放大器模块的报警.................................................................................................95

六．伺服报警诊断.......................................................................................97 报警内容说明..............................................................................................99 详细报警分析及解决方案..........................................................................100

6-1-1．过载报警 (Soft Thermal, OVC)...........................................................................100 6-1-2．反馈断线报警.........................................................................................................101 6-1-3．过热报警.................................................................................................................102 6-1-4．无效的伺服参数设定.............................................................................................102 6-1-5．串行编码器报警.....................................................................................................102 6-1-6．其他报警.................................................................................................................104 6-1-7．如何更换保险和交换线路板..................................................................................105 6-2．FANUCα系列部分参数说明（iB/iC/18i）.............................................................106 6-2-1．参数的修改.............................................................................................................106 6-2--2．参数分类及主要参数说明....................................................................................108