我厂一台B2016A型龙门刨床电气系统出了一次很特殊的故障。故障的出现带有随机性,以致使机床不能正常运行,影响生产。故障现象工作在自动循环工作过程中,当工作台后退行程结束,前进换向后,工作台会突然以高速向前进方向运动(前进速度不受调速控制电路控制),等到操作工采取紧急停车措施,虽然电机停下,但工作台早已越出极限位置。同时,在故障发生时,欲使 I plant a B2016A gantry planer electrical system out of a very special fault. The emergence of failure with randomness, so that the machine can not operate normally, affecting production. Fault phenomenon work in the automatic cycle of work, when the back-end workbench at the end of the forward change, the workbench will suddenly move forward at high speed (forward speed control circuit from speed control), until the operator to take emergency stop Measures, although the motor stopped, but the table has been beyond the limit position. At the same time, in the event of a malfunction, want to make