Troubleshooting Method for Servo System of NC Machining Center

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Troubleshooting Method for Servo System of NC Machining Center


The fault forms of CNC machining center servo system include alarm light abnormality on speed unit, fuse fuse fuse and jump switch for various protection. CNC Machining Center Servo System is a power supply system for machine tools, CNC Machining Center can not process workpieces without servo system, so servo system in CNC Machining Center should stop the whole processing production when the servo system of CNC Machining Center fails. The following is the solution to the common faults of CNC Machining Center Servo System.

The meaning of alarm light varies with the design of speed control unit. Generally, there are the following kinds:

1. Protective switch start alarm. Protective switch is a kind of device to protect machine tools. For example, high voltage will burn some components and other emergency measures that machine tools can not control. When encountering these situations, the protective switch will start to avoid unnecessary component damage, similar to safety stop and so on.

2. Too low voltage leads to machine tool alarm. The probability of this happening in the machining center is very small. It may be that the input voltage is lower than 85% of the rated value, or the power connection is not good.

3. Feedback line break of detection speed leads to alarm, which is an error alarm, because the airport is not a problem, and there are problems in the detection feedback system. Most of the alarms are caused by speed feedback line break of CNC servo motor in machining center or bad contact of its detection feedback line.

4. Overload alarm, the causes of overload alarm are abnormal load of CNC machine in machining center, or too low upper limit of motor current in speed control unit. The falling off of magnet on permanent magnet motor can also cause overload alarm. If the CNC motor without brake is idle, it is hard to rotate by hand or to rotate the axis, that is to say, the whole falling off of magnet.

5. Fuse burning or circuit breaker tripping in NC speed control unit of machining center.

6. High current causes machine tool alarm. In general, there are two possibilities for high current alarm, that is, the damage of power drive components in NC speed control unit of machining center and the high current alarm caused by short circuit.

7. High voltage will also lead to machine tool alarm. There are generally three kinds of situations where high voltage alarm occurs. It may be that the input voltage of NC machining center exceeds 10% of the rated value, or the insulation performance of servo motor decreases, or the high voltage caused by the circuit of speed control unit of machining center.

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