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1.故障现象1台LHM250型高塔吊在进行生产作业时,出现无法回转故障,此时CPU无报警信号。技术人员到现场进行回转操作实验。通过反复操作、仔细观察,初步判断是回转电控系统出现故障。2.工作原理LHM250型高塔吊回转系统采用液压驱动、电气控制,并设置了常闭式制动器,回转系统由操纵手柄操控。其电气控制线路如附图所示。
1. Symptom 1 LHM250 tower crane in production operations, there can be no rotation failure, this time CPU no alarm signal. Technical staff to the scene for rotary operation experiment. Through repeated operation, careful observation, the initial judgment is rotary electrical control system failure. 2. Working principle LHM250 tower crane slewing system with hydraulic drive, electrical control, and set the normally closed brake, slewing system controlled by the joystick. The electrical control circuit shown in the figure.