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Common Problems and Solutions in CNC Finishing Process

October 14, 2022

With the development of science and technology, machining equipment is gradually moving towards numerical control. CNC finishing has become the processing technology of more and more enterprises. Although CNC machining centers have certain skill requirements for operators, CNC machining centers are welcomed by the majority of machining enterprises because of their advantages of high precision, high quality and high efficiency. In this paper, we will specifically introduce the problems encountered in the use of CNC finishing centers and solutions.

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Troubleshooting of CNC finishing:
1. Sudden loss of parameters
In the process of using the horizontal machining center, 930AL and CRT display bar garbled codes appear. After the machine is restarted, the parameters are lost. The machine tool can operate normally when the input parameters are in the startup state.
The sudden loss of parameters is generally related to the memory board, battery or external interference. The appearance of 930AL also indicates that there may be external interference, causing the CPU to work abnormally, so a system alarm occurs. However, it does not rule out motherboard or other PCB failures.

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2. 926 alarm
926 alarm occurs when using the CNC machining center, and there is no display on the LCD of the control system except for the alarm information.
The 926 alarm (FSSB alarm) is caused by the failure of FSSB (servo serial bus) connecting CNC and servo amplifier. If the FSSB, optical cable and servo amplifier connected to the axis control card have problems, this alarm will occur, and the LED on the servo amplifier can confirm the fault location. If the power supply of the servo amplifier fails, FSSB alarm will occur. This is mainly due to the FSSB alarm caused by the voltage drop of the control power supply of the amplifier fault device or the+5V grounding of the encoder cable.

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3. Alarm
The lathe often gives 920, 911 and 930 alarms, among which 930 alarms are the most frequent.
·With the appearance of 911, parity errors occurred in some program memory RAM. The RAM needs to be fully cleared, or the SRAM module or motherboard needs to be replaced, and then the parameters and data can be reset to improve.
·920 is a servo alarm (first to fourth axes), a monitoring alarm or a RAM parity error in the servo module. It can be improved by replacing the servo control module on the motherboard.
·930 is an abnormal alarm interruption. It is mainly caused by the bad motherboard or CPU card. The faulty parts can be confirmed by exchanging parts. In addition, attention should be paid to machine tool grounding, external interference, etc.