Centrifugal fan is a complex structure of equipment, mainly air inlet, air valve, impeller, motor, air outlet composition. In different states, the effect of centrifugal fan is also different. Therefore, different parts of the operation conditions do not agree, centrifugal fan effect will be affected. The centrifugal fan debugging to the best state, can start from a number of aspects.
1. The centrifugal fan is allowed to start at full voltage or lower voltage, but it should be noted that the current at full voltage starting is about 5-7 times of rated current, and the starting torque is proportional to the square of voltage. When the capacity of power grid is insufficient, the reduced voltage starting should be adopted.
2. The centrifugal fan should carefully read the product specification and check whether the wiring method is in accordance with the wiring diagram during the test run; it should carefully check whether the working voltage of the power supply to the fan meets the requirements, and whether the power supply is lacking in phase or in the same phase, Whether the capacity of the distribution components meets the requirements.
3 No less than two people are involved in the test run, one person controls the power supply, one person observes the operation of the fan and finds out the abnormal phenomenon and immediately stops to check; first, check whether the direction of rotation is correct; after the centrifugal fan starts to operate, Check immediately whether the current in each phase is balanced and whether the current exceeds the rated current; If there is an abnormal phenomenon, should stop checking. After five minutes of operation, stop to check if the fan is abnormal and confirm that there is no abnormal phenomenon before starting the machine.
4 . During commissioning of the double - speed centrifugal fan , start the low - speed and check whether the rotation direction is correct ; When starting high speed , the fan must be stopped after the fan is stationary to prevent high - speed reverse rotation , causing the switch to trip and the motor is damaged .
5. When the centrifugal fan reaches the normal speed, it should be measured whether the fan input current is normal or not, and the operating current of the centrifugal fan should not exceed its rated current. If the operating current exceeds its rated current, check that the supply voltage is normal.
6, the motor power required for centrifugal fans refers to the high power required when the inlet of the air inlet is fully open to the centrifugal fan and the fan box under certain working conditions. If the inlet of the air inlet is fully open, the motor has the danger of damage. When the fan is in test, the valve is best to shut the valve on the inlet of the fan or the outlet pipe, and the valve is gradually opened after running to reach the required work. Pay attention to whether the running current of the fan exceeds the rated current.
The centrifugal fan shall be debugged strictly in accordance with the above debugging methods, Then the efficiency of centrifugal fan is over 98%. http://www.jnblower.com/