The centrifugal fan allows full-voltage starting or reduced-voltage starting. However, it should be noted that the starting current under full-voltage starting is approximately 5 to 7 times the rated current. The starting torque of reduced-voltage starting is proportional to the square of the voltage. When the power grid capacity is insufficient, reduced-voltage starting should be adopted.

When commissioning the centrifugal fan, carefully read the product manual and check whether the wiring method is consistent with the wiring diagram. Seriously check whether the working voltage of the power supply for the fan meets the requirements, whether the power supply is missing a phase or has the same phase, and whether the capacity of the electrical components equipped meets the requirements.

During the commissioning, there should be no less than two people present. One person controls the power supply, and the other observes the operation of the fan. Immediately stop the machine for inspection if any abnormal phenomena are found. First, check whether the rotation direction is correct. After the centrifugal fan starts running, immediately check whether the running currents of each phase are balanced and whether the current exceeds the rated current. If there are any abnormal phenomena, stop the machine for inspection. After running for five minutes, stop the machine to check whether there are any abnormal phenomena on the fan. Confirm that there are no abnormal phenomena before starting the machine again for operation.

When commissioning a two-speed centrifugal fan, first start it at a low speed and check whether the rotation direction is correct. When starting at a high speed, it is necessary to wait until the fan stops completely before starting again to prevent reverse rotation at high speed, which may cause the switch to trip and damage the motor.

When the centrifugal fan reaches the normal rotational speed, measure whether the input current of the fan is normal. The running current of the centrifugal fan should not exceed its rated current. If the running current exceeds its rated current, check whether the supplied voltage is normal.

The motor power required by the centrifugal fan refers to the relatively large power required when the centrifugal fan and the fan box are in a certain working condition with the air inlet fully open. If the fan runs with the air inlet fully open, there is a risk of damage to the motor. When commissioning the fan, it is best to close the valves on the inlet or outlet pipes of the fan. After starting the operation, gradually open the valves until the required working condition is reached, and pay attention to whether the running current of the fan exceeds the rated current.