"Micro Cooling Fan" improperly adjusted; Rotor long-term placement improperly changed the dynamic balance precision; failure to overhaul rules, undermining the original machine with the nature and accuracy. "Micro Cooling Fan" Operation Run Cause: In the course of the fan, the fan maintenance, maintenance of good or bad, on the quality of the fan running plays a decisive role. Such as: the process parameters (such as temperature medium, pressure, flow, load, etc.) deviate from the design value, the machine operation condition is not normal; the machine super speed, overload operation, the change in the operating characteristics of the machine; poor lubrication or cooling; Rotor partial damage or fouling; improper start or stop the lift speed operation, thermal expansion uneven or too critical zone residence time waiting. "Micro Cooling Fan" machine deterioration Cause: Usually apparatus is in use has a certain number of years, up to a certain number of years the device performance will deteriorate. For fans concerned, too, such as: long-term operation, the rotor deflection increases or balancing deterioration; rotor local damage, loss or cracks; parts wear, pitting or corrosion; mating surface by the force of the deterioration, produced a lack of interference or loosening, damage to nature and the accuracy of the fit; uneven foundation settlement machinery, machine housing deformation.