In different states, the effect of centrifugal fan is different. In order to debug the centrifugal fan to the ideal state, we can start from many aspects. For example, centrifugal fans allow full-voltage start or step-down motor, but attention should be paid to the rated current of about 5-7 times when full-voltage start. The step-down starting torque is proportional to the square of voltage. When the power grid capacity is insufficient, step-down start should be adopted.
In the test run of centrifugal fans, the product specifications should be read carefully to check whether the wiring method is in accordance with the wiring diagram, whether the working voltage of the power supply to the fans meets the requirements, whether the power supply is out of phase or in phase, and whether the capacity of the components of the distributor meets the requirements.
When the centrifugal fan starts to run, it should check whether the running current of each phase is balanced and whether the current exceeds the rated current immediately; if there is abnormal phenomenon, it should stop to check. After running for five minutes, stop the fan to check if there is any abnormal phenomenon, confirm that there is no abnormal phenomenon and then start the operation.
If it is a two-speed centrifugal fan, it should start at low speed to check whether the rotation direction is correct; when starting at high speed, it must wait until the fan is still before starting, in order to prevent high-speed reverse rotation, causing switch tripping and motor damage. In addition, it is necessary to measure whether the fan input current is normal and the operating current cannot exceed its rated current. If the operating current exceeds its rated current, it is necessary to check whether the supplied voltage is normal.
When the centrifugal fan is tested, it is better to close the valve on the inlet or outlet pipeline of the fan, and gradually open the valve after operation until the required working condition is reached, and pay attention to whether the operating current of the fan exceeds the rated current.