Handling Methods of Failure of Servo System of CNC Machining Center

The faults of the servo system of the CNC machining center include alarms such as abnormal alarm indicator lamps on the speed unit of the CNC, blown fuses, and various protective trip switches.

The servo system of the CNC machining center is a system that provides power to the machine tool. Without the servo system, the CNC machining center cannot process the workpiece. Therefore, the servo system is in the CNC machining center. Once the servo system of the precision CNC machining center fails, the entire processing and production will stop. Next, the following is the solution to the common failures of the servo system of CNC machining center.

The meaning of the alarm indicator lamps varies with the design of the speed control unit. Generally, there are the following types:

1. The switch that protects the CNC machining starts to alarm. The protection switch is a device to protect the machine tool. For example, high voltage which burns some components and other emergencies that the machine tool cannot control. When encountering these situations, the protection switch will start to avoid unnecessary component damage, similar to safety stop and the like.

2. When the voltage is too low during CNC machining, the machine tool alarms. The chance of this happening in the CNC machining center is very low. This situation may occur when the input voltage is lower than 85% of the rated value, and it may be caused by the poor connection of the power supply.

3. During CNC machining, the feedback line of detection speed is broken and the alarm is caused. This is a false alarm, because the machine tool itself has no problem, and there is a problem with the detection feedback system. This alarm is mostly caused by broken speed feedback line of the servo motor of the CNC machining center or caused by poor contact of the detection feedback line.

4. Overload alarm of CNC machining center. The cause of the overload alarm is abnormal mechanical load of the CNC machining center, or the upper limit of the motor current on the speed control unit is set too low. The loss of magnets on permanent magnet motors can also cause overload alarms. If the CNC machining center without a brake motor cannot be rotated by hand or the shaft is hard to rotate when there is no load, it means that the magnets have completely fallen off.

5. The fuse on the CNC speed control unit of the CNC machining center is blown or the circuit breaker is tripped.

6. Large current during CNC machining causes the machine tool to alarm. In general, there are two possibilities for a large current alarm, that is, the large current alarm caused by the damage or short circuit of the power drive element on the speed control unit of the CNC machining center.

7. High voltage during CNC machining will also cause machine tool to alarm. There are generally three possibilities for high voltage alarms. It may be that the input voltage of the CNC machining center exceeds 10% of the rated value, or the insulation performance of the servo motor is reduced, or high voltage caused by the circuit of the speed control unit of the machining center.