Troubleshooting of CNC machine tools

1, initialization reset method: Under normal circumstances, the system alarm caused by transient faults can be cleared by hardware resetting or switching the system power supply in turn. If the system working storage area is chaotic due to power failure, circuit board removal or battery undervoltage, the system must be initialized and cleared. Before clearing, pay attention to making data copy records.

2, parameter change, program more correct method: system parameters are the basis for determining the function of the system, parameter setting error may cause system failure or a function is invalid. Sometimes due to user program errors can also cause fault shutdown, which can be checked by the block search function of the system to correct all errors to ensure its normal operation.

3, adjustment, optimization adjustment method: adjustment is one of the most simple and easy way. Correct system faults by adjusting the potentiometer. For example, in the maintenance of a factory, the system display screen is chaotic, and it is normal after adjustment. For example, in a factory, the main shaft in the starting and braking of the belt slip, the reason is that the main shaft load torque is large, and the drive device oblique lift time is set too small, after adjustment normal.

The optimal adjustment is a comprehensive adjustment method to achieve the best match between the servo drive system and the driven mechanical system. The method is very simple. A multi-wire recorder or a dual-trace oscilloscope with storage function is used to observe the response relationship between the command and the speed feedback or the current feedback respectively. By adjusting the proportional coefficient and integration time of the speed regulator, the servo system can achieve the best working state with high dynamic response characteristics and no oscillation. In the case of no oscilloscope or recorder in the field, according to experience, that is, the adjustment makes the motor vibrate, and then slowly adjust to the reverse until the shock is eliminated.

4, spare parts replacement method: replace the diagnosed bad circuit board with good spare parts, and do the corresponding initial start, so that the machine tool is quickly put into normal operation, and then the bad board repair or repair, which is the most commonly used troubleshooting method.

5, improve the quality of power supply method: generally use a regulated power supply to improve power supply fluctuations. For high-frequency interference, capacitor filtering can be used to reduce the failure of the power supply board through these preventive measures.

6, maintenance information tracking method: some large manufacturing companies according to the actual work due to the accidental failure caused by design defects, constantly modify and improve the system software or hardware. These changes are continuously provided to maintenance personnel in the form of maintenance information. As a basis for troubleshooting, the fault can be correctly and completely eliminated.