[CNC lathe machine supplier]Analysis and troubleshooting examples of common faults in CNC system

Analysis and troubleshooting examples of common faults in nc system

(1) hardware failure

CNC lathe machine china manufacturer shares that the 850/880 system adopts large-scale integration and special integrated circuit, with good reliability. Therefore, the hardware failure rate of the is relatively low compared with other alarms and faults. Generally, the hardware failure should be analyzed. To the hardware and basic system software and comprehensive in-depth analysis of understanding, according to the phenomenon analysis of the fault, so as to use the same type of board to replace, general eprom submodule is not easy to go wrong, can be erased to replace the board to use, according to the actual situation to adjust, make the system back to normal work; "Replacement method" is the most effective method to solve the fault of the hardware itself. Finally, the faulty board is repaired by the instrument and used as spare parts after repair.

[Example] central controller on the 5 v power supply indicator not on (green), the system work, check the fan is operating normally, should be a 5 v power supply current green light should be bright, not bright now, prove that there is a problem, the electricity supply separate remove the test, the green light, the problem is not power, but outside the board has a problem, use "plug" test (note: brush drawing boards should be a power outage, and should be a power outage 8 min can be carried out after finish discharge) prove that there was a piece of measuring circuit board has fault, in the same model spare parts (note: the small dial the code switch to choose). All the tests were normal, and it was proved that there was something wrong with replacing the measuring circuit board. It was found that a 47uf capacitor seriously leakage caused by short-circuit was found in the multimeter inspection.

Inspection found that the operation of a few boards in the panel often gray, clean board after normal. Therefore, it is relatively important to keep the central controller and operating panel clean. Since there are fans in the central controller and operating panel, it is easy for the fans to turn and breathe in dust easily.

[Example] a large number of alarm Numbers appear on the 37crt screen, but cannot be eliminated, such as 40com-cpufault, 41nc-cpufault, 43plc-cpufault, 47, 71, 77, 78, 70 and other alarms. By understanding the cause and effect of the operation, the cause of the fault can be analyzed. Originally, when the operator installed 2 hydrostatic trailers on VDF truck, due to no power failure and live plug, he switched several backplates and found that the ram sub-module for storing machine data was damaged. After replacement of spare parts, all formatting, into the original machine data program after normal, therefore, must pay attention to not live plug, otherwise the consequences are very serious.

PLC output board fault can be roughly divided into three kinds; (1) PLC output a=1, led indicator light, but the control of the relay or solenoid valve does not work, which is often caused by loose wiring head. (2) PLC output a=0 but led indicator light has been on, indicating that there is a problem with this output board, output tube damaged on. (3) PLC output a=0, sometimes there is output, sometimes no output, unstable, easy to cause judgment error, fault is not easy to find, for (2) only replacement of spare parts.

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