English Author: Site Editor Publish Time: 2025-12-10 Origin: Site
Typical common fault situations of CNC machining centers
1. The leakage protection device trips frequently
This is usually due to abnormalities in the grounding system, such as poor connection of the grounding body or excessive contact resistance. It could also be caused by a decline in the insulation performance of the frequency converter and servo driver inside the control cabinet, resulting in excessive leakage current. A short circuit or ground fault at the output end of the power transformer can also cause this problem.
2. Hydraulic system lock alarm (such as 1040DAC code)
This is mostly due to hydraulic pump failure or oil circuit leakage, which causes a sudden drop in system pressure. Clogging of the filter element or insufficient oil level, which affects oil supply, is also a common cause.
3. Abnormal axis movement (such as overload of X-axis load)
Jamming or insufficient lubrication of mechanical transmission components (such as lead screws and guide rails), as well as improper parameter Settings of servo drives, may all lead to jamming or overload alarms during shaft movement.
4. Spindle heating and decrease in rotational accuracy
Dust and moisture mixed in the lubricating grease of the main shaft bearing, or slight scratches on the positioning surface of the inner taper hole, causing eccentricity in the fit, can all lead to this problem. A decrease in the preload of the front bearing and fatigue failure of the disc spring may also cause tool movement.
5. The steel ball of the pull rod of the main shaft component is damaged
This is usually related to the Y-axis moving to a specific position and then stopping. It might be a problem with the fit between the limit switch stop iron and the pneumatic-hydraulic booster cylinder, causing the mechanical hand to attempt to draw the tool before the tool holder is fully released.
6. No response when the system is powered on
Phase loss or short circuit of the external power supply, tripping of the power protection device, incorrect address of the PLC, problem with the interlock device, and damage to components (such as blown fuses) may all cause this fault.
7. The circuit breaker trips immediately after the strong current part is connected
A common cause is that the capacity of the air switch is too small, or the current fluctuation when the frequency converter or servo drive is powered on is too large, exceeding the limit current of the air switch.
8. Abnormal pressure and noise in the hydraulic system
Overheating of the oil tank, excessively high temperatures of the hydraulic pump and motor housing, as well as sharp sounds emitted by the system when the Z-axis ram drops, may all be manifestations of the pressure gauge pointer exceeding its range, severe pressure fluctuations, or abnormal noise from the hydraulic station.
9. External signal failure
If the "1008 Insufficient hydraulic pressure" alarm is triggered, it might be due to a damaged pressure relay. This type of malfunction usually follows a pattern and the actual pressure may fully meet the requirements.
10. Abnormal operation of the numerical control system
Unstable power supply, control system failure, sensor damage, mechanical component failure, program errors, electrical circuit problems, and environmental factors (such as abnormal temperature and humidity) can all lead to abnormal system operation.
11. Servo system error alarm
This might be caused by a component failure in the feed servo drive device, while the overheat alarm could be due to excessive current in the servo motor causing the thermal control switch to act.
12. System self-check error
If the panel indicator lights of the SIEMENS880M system keep jumping in a loop after startup and the monitor shows no display, this is usually due to an error in the system CPU board or system software. It can be eliminated through initialization processing.
