1 look at random files
The motor fans are randomly equipped with instructions, product certificate, electrical wiring diagram and packing list, to check the packing list and check the parts.
2 look at the shape of the motor fan
Check whether the fan mesh and fan blade have obvious deformation. Turning the fan leaf should be light and flexible, and should not stop in the same position.
3 look at startup performance
The starting performance is the important quality index of the motor fan. During the test, when the rated speed is 85%, the motor fan should start from static state and run normally. The shorter the time required for starting the motor fan to normal operation, the better the starting performance of the motor fan.
4 look at the performance of speed regulation
After electricity, there should be no abnormal noise in the mechanical transmission part of the fan. When the electric fan operates at high, medium and low speed, both the motor and the fan leaf should be stable, small vibration and low noise. The motor fan, should be shut down without a break, agile, stagnation and jitter.
5 see if the electricity is leaks
Electric motor fan, touch such as hemp electricity feeling, with a test pencil test, test pencil has led display, can judge the housing leakage, not to.
6 see the continuous operation of the motor fan
After 2 hours of continuous operation of the electric fan, if the head of the head is scald on the surface of the head, it shows that the temperature is too high and can not be used. Under normal conditions, the surface temperature of the head of the machine is below 50 degrees C, and it should not feel hot.