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If the dragon carving and milling machine problems, the most important thing is making comprehensive inspection, find out what the reason, such ability according to the reasons to solve the fault. 
Such as dragon carving and milling machine table speed has a problem, check the content is as follows:
1, if the forward and backward dragon carving and milling machine control handle rotating to the right in the end, to reach a speed, then the reason is: low pressure loop to jilt, voltage negative feedback excitation class have formed as a result. 
2, strong negative pressure anti talked often because 200 - s, -f internal caused by open circuit, voltage between 200 v - SY - F originally, for half of the generator voltage below, v - 200 s, after open circuit voltage between two points between the -f is basically equal to the generator voltage, namely, on the basis of original increased 2 times. 
3, in the process of transition, dragon carving and milling machine overshoot phenomenon is important to note that, in the process of the rotational speed is to rely on in the process of maximum overshoot as IF close, such as the overshoot phenomenon happened, so we will appropriate relief. 
4, gantry milling machine in the process of production, the phenomenon of workbench, motionless, its reason is caused by current positive feedback, the more serious is to translate into negative feedback current positive feedback phenomenon, these can cause the phenomenon of workbench does not move.So closely check the level of positive and negative feedback, let in under 10 m/min speed droop not more than 1 after turning off the best.