"Cross Flow Fan" centrifugal cooling fan is a complex structure of the equipment, the main air inlet valve, impeller, motor, the outlet composition. In different states, the effect of centrifugal cooling fan is not the same. Therefore, different operating conditions partly dissenting, centrifugal fan cooling effect will be affected. The centrifugal fan debugging to the best condition, can start from several aspects. Centrifugal fan allow full pressure start or step-down power, it should be noted that the current full voltage starting is about 5-7 times the rated current, voltage starting torque is proportional to the square of the voltage, when there is insufficient network capacity, should buck starter.