How to troubleshoot a CNC lathe?
Aug 28,2024

1. Initialization reset method: In general, system alarms caused by transient faults can be cleared by hardware reset or switching the system power supply in sequence. If the system's working storage area is chaotic due to power failure, unplugging or unplugging circuit boards, or low battery voltage, the system must be initialized and cleared. Before clearing, attention should be paid to copying and recording the data. If the fault cannot be eliminated after initialization, hardware diagnosis should be performed.
2. Parameter modification and program correction method: System parameters are the basis for determining system functions, and incorrect parameter settings may cause system failures or render certain functions invalid. Sometimes, user program errors can also cause malfunctions and shutdowns. In this case, the system's block search function can be used to check and correct all errors to ensure its normal operation.
3. Adjustment, optimization adjustment method: Adjustment is the simplest and most feasible method. Correct system faults by adjusting the potentiometer. During the maintenance of a certain factory, the system display screen was chaotic, but after adjustment, it returned to normal. In a certain factory, the main shaft experiences belt slippage during start-up and braking due to the high load torque of the main shaft and the setting of the drive device's tilt time being too small. After adjustment, it returns to normal.
Optimization adjustment is a comprehensive adjustment method that systematically achieves the best match between the servo drive system and the dragged mechanical system. The method is simple, using a multi line recorder or a dual track oscilloscope with storage function to observe the response relationship between instructions and speed feedback or current feedback, respectively. By adjusting the proportional coefficient and integration time of the speed regulator, the servo system can achieve the optimal working state with high dynamic response characteristics without oscillation. In the absence of an oscilloscope or recorder on site, based on experience, adjust the motor to start oscillating, then slowly adjust it in reverse until the oscillation is eliminated.
4. Spare parts replacement method: Use good spare parts to replace the diagnosed faulty circuit board, and perform corresponding initialization startup to quickly put the machine tool into normal operation. Then repair or rework the faulty board. This is the most commonly used troubleshooting method.
5. Improving power quality method: Generally, a regulated power supply is used to improve power fluctuations. For high-frequency interference, capacitor filtering can be used as a preventive measure to reduce power board failures.
6. Maintenance information tracking method: Some large manufacturing companies continuously modify and improve system software or hardware based on occasional failures caused by design defects in actual work. These modifications are continuously provided to maintenance personnel in the form of repair information. As a basis for troubleshooting, this can correctly and thoroughly eliminate faults
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