瓦里安Clinac IX直线加速器故障维修实例

Troubleshooting Example of Varian Clinac IX Linear Accelerator

本文列举了我院瓦里安Clinac IX直线加速器3例故障的维修过程并对故障原因、维修结果进行分析。第1例为CARR和FOIL联锁故障,根据系统提示错误信息,首先更换了S9开关,重新执行Carrousel校准程序后提示S4开关信号异常,根据信号走向逐级排查,确定W32线缆4号信号线故障,在进行调线处理后故障消除;第2例为KVS机械臂故障,系统提示KVS机械臂各关节位置未校正,使用BMC手控盒校准发现机械臂只能做收回运动,通过交换测试排除MDB板和I/O板故障,进一步排查确定W112线缆5号信号线断路,在进行调线处理并执行校准程序后故障排除;第3例为HWFA联锁故障,该故障多与运动部件有关,经过排查确定因机头链条松动导致S1和S2开关接触不良引发HWFA联锁,调节好链条张力后故障排除。通过对3例故障的维修,更加深刻理解瓦里安Clinac IX直线加速器的工作原理与物理结构,并能更快地发现并解决故障,提高工作效率,提升设备使用质量,可更好地服务于临床。

The maintenance process of three faults cases of Varian Clinac IX linear accelerator in our hospital was listed in this paper,and the causes of the faults and the maintenance results were analyzed.The first case was CARR and FOIL interlock fault.According to the error message prompted by the system,the S9 switch was replaced first.After re-executing the Carrousel calibration procedure again,the S4 switch signal was prompted to be abnormal.According to the signal trend,it was determined that the No.4 signal line of W32 cable was faulty,and the fault was eliminated after line adjustment.The second case was the fault of KV source(KVS)arm.The system prompted that the position of each joint of KVS arm was not corrected.After calibration with the backup motion control box,it was found that the arm could only retract.Then,the fault of motor driving board and I/O board was eliminated through the exchange test.Further troubleshooting confirmed that the No.5 signal line of W112 cable was open circuit,and the fault was eliminated after the line adjustment and calibration procedures were performed.The third case was HWFA interlock fault,which was mostly related to the moving parts.After checking one by one,it was determined that the HWFA interlock was caused by the poor contact between S1 and S2 switches.After adjusting the chain tension,the fault was eliminated.Through the maintenance of three cases of fault,we had a deeper understanding of the working principle and physical structure of Varian Clinac IX linear accelerator,which could find and solve the faults faster,improve the working efficiency and the service quality of the equipment,and provide better sevivce for clinical services.