Debugging Method Of Centrifugal Fan

A centrifugal fan is a device with a complex structure, mainly composed of an air inlet, an air valve, an impeller, a motor, and an air outlet. The effect of centrifugal fans varies in different states. Therefore, the operating conditions of different parts are not uniform, which will affect the effectiveness of the centrifugal fan. Debugging the centrifugal fan to its optimal state can be approached from multiple aspects.
1. Centrifugal fans allow full pressure starting or voltage reduction electric, but it should be noted that the current during full pressure starting is about 5-7 times the rated current, and the voltage reduction starting torque is proportional to the square of the voltage. When the grid capacity is insufficient, voltage reduction starting should be used.
2. During the testing of centrifugal fans, it is necessary to carefully read the product manual and check whether the wiring method is consistent with the wiring diagram; It is necessary to carefully check whether the working voltage of the fan power supply meets the requirements, whether the power supply is out of phase or in phase, and whether the capacity of the electrical components provided meets the requirements.
3. During the test drive, there should be no less than two people, one controlling the power supply and the other observing the operation of the fan. If any abnormal phenomena are found, the machine should be stopped immediately for inspection; Firstly, check if the rotation direction is correct; After the centrifugal fan starts running, it should be immediately checked whether the operating currents of each phase are balanced and whether the current exceeds the rated current; If there are any abnormal phenomena, the machine should be stopped for inspection. After running for five minutes, stop the machine and check if there are any abnormalities in the fan. Confirm that there are no abnormalities before starting the machine.
4. When testing a dual speed centrifugal fan, start at low speed first and check if the rotation direction is correct; When starting at high speed, the fan must be stopped before starting to prevent reverse rotation at high speed, which may cause switch tripping and motor damage.
5. When the centrifugal fan reaches normal speed, the input current of the fan should be measured to ensure that it is normal. The operating current of the centrifugal fan should not exceed its rated current. If the operating current exceeds its rated current, check if the supplied voltage is normal.
6. The required motor power for a centrifugal fan refers to the higher power required for the centrifugal fan and fan case when the air inlet is fully open under certain operating conditions. If the air inlet is fully open for operation, there is a risk of damage to the motor. It is best to close the valves on the inlet or outlet pipelines of the fan during the fan test run. After operation, gradually open the valves until the required working conditions are reached, and pay attention to whether the operating current of the fan exceeds the rated current.
Strictly following the above debugging method to debug the centrifugal fan can achieve an efficiency of over 98%.