production site. The rapid troubleshooting should follow the core principles of "starting with the easy tasks, then the difficult ones; starting from the external components, then the internal ones; starting with the electrical system, then the mechanical system". Avoid blindly disassembling the equipment, which can significantly reduce the inspection time. Here is a feasible rapid troubleshooting process:

Step 1: Basic operation and status check (about 10% of the faults can be resolved here). First, confirm if the emergency stop button has been reset - operators often mistakenly press the emergency stop button during production and fail to reset it, which will cut off the power output of all axes; then check for overtravel alarms: if the screen shows an overtravel prompt, manually move the axis in the opposite direction of the overtravel until the alarm is eliminated; check the operation status: confirm that the system is not in program pause, the feed rate is 0, or the axis is in locked mode, and the selected coordinate axis for startup is correct. These checks do not require disassembling the equipment, and can be completed in 1 minute, quickly resolving faults caused by improper operation.

Step 2: Power and power supply circuit inspection. After the basic operation is normal, check the power indicator light of the servo driver: if the light is not on, first check if the external circuit breaker has tripped or the fuse has blown, and measure the three-phase voltage of the servo main circuit with a multimeter to confirm if there is a phase missing or abnormal voltage; if the power light is on, check if the power line of the servo motor is loose - long-term vibration of the equipment can cause the terminals to loosen, pull out and reinsert them to fix them; at the same time, confirm if the control power is normal, some axes' enable function relies on the control circuit power supply, and the absence of control power will directly prohibit the axis from starting.

Step 3: Signal and feedback circuit diagnosis. After the power is normal, check the alarm codes of the CNC system: common alarms such as "axis enable disconnected", "safety circuit interrupted", "encoder fault", etc. If the alarm indicates disconnected enable, check the peripheral safety signals: is the safety door fully closed, is the limit switch triggered, are the travel switches of each protective device reset - the absence of these safety signals will trigger PLC interlock, locking the power output of the axis; if the alarm is encoder fault, check if the encoder wiring is damaged or loose, confirm that the plug is inserted tightly, then restart the system, if no improvement, test the encoder itself.

Step 4: Drive and motor fault troubleshooting. If the signal is normal but the axis still fails to start, check the operating status of the servo driver: if the driver shows overload or overcurrent alarms, manually rotate the screw of the axis: if the screw cannot rotate, it indicates that the mechanical load is stuck; if the screw rotates smoothly, check the motor winding: use a multimeter to measure the resistance of the three-phase winding of the motor, confirm if it is balanced, if there is an abnormal resistance in any phase, it indicates a short circuit or burnout inside the motor; if the driver shows a fault light, you can try to power off and restart, some temporary communication failures can be restored by yourself.

Step 5: Mechanical transmission rapid detection. After the electrical troubleshooting is normal, check the mechanical part: manually rotate the coupling between the motor and the screw, if the coupling is loose or disengaged, re-tighten the bolts; if it is difficult to rotate the screw, check if the guide rail insert strip is too tight, or if there is iron filings accumulated on the guide rail surface, clean the iron filings or appropriately adjust the insert strip; at the same time, confirm if the lubrication system is working, dry grinding of the guide rail due to lack of oil will also cause the axis to be unable to move.

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