Trouble-shooting and troubleshooting: Considering that the machine tool is damaged during processing, the fault is most likely to occur in places where the drive and high-frequency power supply have large currents. First check the X, Y, Z DMD? 07 board separately found no problems. Then check the high-frequency part, unplug the GHP? 25 board and found that the +300V printed line on the printed board has burned, and then check the 4 sets of power amplifiers in the latter stage, and found that Q101IRF740 and IN5418 have all penetrated. Considering that this group is in parallel with the other three groups, removing this road should not affect the normal work. At that time, it was decided to solder the components, solder the +300V wire, plug the board, and start the machine normally. Later, the IRF740 was bought on the market, but the IN5418 has never been available, and this group of components has not been connected. This machine has been working normally so far (more than 4 years). 1681 and 1682 are the servo enable signals for the Y and Z axes, respectively. When the Y-axis is manually moved, it is found that the coordinate value of the Y-axis on the screen changes, but the Y-axis does not move. When the value on the screen changes to about 14, the 1121 alarm occurs. The same is true when manually moving the Z axis. Check the servo unit of the machine. When a fault occurs, the H1/A alarm light on the corresponding servo controller lights up, indicating that the servo motor is overloaded. According to the analysis of these phenomena, it may be that the mechanical resistance of the shaft movement is too large. The operator reported that the night before, the machine tool had stopped because of insufficient lubrication pressure, so the suspected failure was caused by poor lubrication and increased mechanical resistance. Checking the lubrication control system found that the lubrication pump did not work because one of the output relays of the PLC was damaged. After replacing it with a new one, the lubrication system returned to normal operation. In order to fully lubricate the machine tool, after the lubrication system is normal, the machine tool runs empty for a period of time and no other operations are performed. After two or three hours, the reference point is operated, and the Z axis returns to normal, and the 1121 and 1681 alarms are generated when the Y axis moves. At this time, we are convinced that the cause of the failure is poor lubrication, and the mechanical resistance becomes large, so that the servo motor does not move to generate an overload alarm. According to the working principle of the machine tool, the Y-axis servo motor drives the upper and lower robots to rotate through a synchronous tooth belt. Manually moving the robot, it is really a lot of resistance. To this end, we first disconnected the servo motor from the robot's rotating shaft. At this time, it was found that the rotating shaft of the robot was very light and easy to rotate, while the servo motor shaft was tight and the disk did not move. According to the working principle of the machine tool and the electrical schematic diagram analysis, the original robot's rotating shaft has an angle of less than 10° with the vertical direction. In order to prevent the manipulator from slipping during power failure, the Y-axis uses a servo with a brake. The motor, so the motor shaft does not move. In order to confirm whether there is any problem with the servo motor brake, the brake coil, PLC brake control output signal was checked, and a new relay was replaced, but the problem was not solved. Later, the connection line was inspected, and it was found that among the numerous serial terminals, one terminal screw was loosened, so that the power supply connection was not good, and there was no power supply in the rear part. Re-tighten this terminal and restart it. At this time, check the brakes of the two shafts and the power supply is normal. Manual movement of all axes is also normal and the fault disappears. Because the Y-axis synchronous toothed belt has been removed, in order to find the reference point, the process of finding the reference point of the Y-axis is normal after multiple adjustments. The machine tool showed 222 alarms and a CNC milling machine with Siemens SINUMERIKSYSTEM3TT. When the power is turned back to the reference point, there is no problem with the X and Z axes of the two stations. When the three stations return to the reference point, the alarm 222 "CONTROLLOOPNOTREADY" appears, and the Z axis generates a 222 alarm. Check the servo control system, which also has alarm information. The machine tool servo system uses the Siemens 6SC610 system, the fourth axis of the control board, that is, the three failure phenomenon: the z-axis electrode discharges on the workpiece for a while, and stops. Fault analysis and overhaul: At first it was suspected that the high-frequency board SBC?02, MCI?01, GHP?50 were faulty. After being interchanged with the Mondo30 machine board, it can only work normally for 1 day, and the above failure occurs again. It is suspected that other related boards are faulty. During the search, I suddenly found that the SBC?02 board had a fiber optic cable connected to the PIF?01, so the PIF?01 board was removed, and no problem was found. All the integrated circuits were put in place before the board was loosened. Press the hand by hand. After starting up, the machine works normally. It is now estimated that there is a poorly connected integrated circuit in the PIF?01 board, so that the signal is not transmitted, and the above failure occurs. (Finish) TIG Welding Torch，TIG Welding Torch Jy-Wp26，TIG Welding Torch Body Xingyu Welding Equipment Co.,Ltd. , http://www.rqwelding.com