Commissioning requirements for centrifugal fans

1. Centrifugal fans are allowed to start at full voltage or to reduce voltage, but it should be noted that the current at full voltage starting is about 5-7 times the rated current, and the starting torque of reduced voltage is proportional to the square of the voltage. When the power grid capacity is insufficient, A reduced voltage start should be used. 

2. When testing the centrifugal fan, you should carefully read the product manual and check whether the wiring method is consistent with the wiring diagram; you should carefully check whether the working voltage of the power supply to the fan meets the requirements, whether the power supply is out of phase or in the same phase, and whether the electrical components are distributed. whether the capacity meets the requirements. 

3. There are no less than two people in the test machine, one person controls the power supply, and the other person observes the operation of the fan. If any abnormality is found, immediately stop the inspection; first check whether the rotation direction is correct; after the centrifugal fan starts to run, immediately check whether the operating current of each phase is correct. Balance, whether the current exceeds the rated current; if there is any abnormal phenomenon, it should be stopped for inspection. After running for five minutes, stop the fan to check whether there is any abnormal phenomenon, and then start the operation after confirming that there is no abnormal phenomenon. 

4. When testing the two-speed centrifugal fan, start at low speed first to check whether the rotation direction is correct; when starting at high speed, wait for the fan to stand still before starting it to prevent high-speed reverse rotation, causing switch tripping and motor damage. 

5. When the centrifugal fan reaches the normal speed, it should be measured whether the input current of the fan is normal, and the running current of the centrifugal fan should not exceed its rated current. If the operating current exceeds its rated current, check whether the supplied voltage is normal.

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