The centrifugal fan is a complex device, which mainly consists of an air inlet, a damper, an impeller, a motor, and an air outlet. Under different conditions, the effect of the centrifugal fan is also different. Therefore, the operating conditions of different parts are not uniform, and the effect of the centrifugal fan will be affected. To debug the centrifugal fan to the best condition, you can start from many aspects.
1. The centrifugal fan allows full-voltage starting or reduced-voltage electric, but it should be noted that the current at full-voltage starting is about 5-7 times the rated current, and the reduced-voltage starting torque is proportional to the square of the voltage. When the grid capacity is insufficient, Start with reduced voltage.
2. When the centrifugal fan is being tested, read the product manual carefully to check whether the wiring method is consistent with the wiring diagram; carefully check whether the working voltage of the power supply to the fan meets the requirements, whether the power supply is lacking or in the same phase, and the power distribution components Whether the capacity meets the requirements.
3. There are no less than two people during the test run. One person controls the power supply, and the other observes the operation of the fan. If abnormalities are found, the machine should be shut down and checked immediately; first check whether the direction of rotation is correct; after the centrifugal fan starts to run, check whether the operating current of each phase is balanced 、Whether the current exceeds the rated current; if there is any abnormality, stop the machine for inspection. After running for five minutes, stop the machine and check whether the fan is abnormal, and then start the machine after confirming that there is no abnormality.
4. When the two-speed centrifugal fan is tested, start at a low speed first to check whether the direction of rotation is correct; when starting at a high speed, wait until the fan is stationary before starting to prevent high-speed reverse rotation, which may cause the switch to trip and damage the motor.
5. When the centrifugal fan reaches the normal speed, measure whether the input current of the fan is normal, and the operating current of the centrifugal fan cannot exceed its rated current. If the operating current exceeds its rated current, check whether the supplied voltage is normal.
6. The motor power required by the centrifugal fan refers to the larger power required for the centrifugal fan and the air box under certain working conditions when the air inlet is fully opened. If the air inlet is fully opened for operation, the motor may be damaged. It is best to close the valve on the inlet or outlet pipe of the fan during the test run, 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.
