The centrifugal fan cannot be used directly after installation. It must be debugged to confirm that there is no abnormality before it can be put into use, which can reduce the failure rate.
1) Debugging method of centrifugal fan
1. Select the starting method
Centrifugal fans can start at full pressure or start at reduced pressure, but it should be noted that the current at full pressure starting is about 5-7 times the rated current, and the starting torque of reduced pressure is proportional to the square of the voltage. If the grid capacity is insufficient, it can be Start with reduced voltage.
2. Inspection before commissioning
During the test run, check whether the wiring method is consistent with the wiring diagram according to the product manual, check whether the working voltage of the power supply to the fan meets the relevant requirements, whether the power supply is phase-missing or in the same phase, and check whether the capacity of the electrical components meets the requirements.
3. Start-up test run
There should be no less than two staff members for debugging work, because one person needs to control the power supply and one person observes the operation of the fan. If any abnormality is found, stop the machine immediately for inspection, first check whether the operation mode is correct, and observe each phase after starting the operation. Check whether the running current is balanced and whether the current exceeds the rated current. If there is any abnormality, please stop the machine immediately to check. After running for about 5 minutes, stop the fan to check whether there is any abnormality, and then start the operation after no problem.
4. Pay attention to the starting sequence
If it is a two-speed centrifugal fan, you should start the low speed first during the test run, and also check whether the selected direction is correct. When starting the high-speed fan, you need to wait until the fan is stationary before starting it, so as to avoid high-speed reverse rotation, which may cause tripping or damage to the motor.
5. Measure the input current
When running to normal speed, it is necessary to measure whether the input current of the fan is normal, and it is required that the running current cannot exceed the rated current. If it exceeds, check whether the supplied voltage is normal.
6. Debug the air inlet
Under certain working conditions, the motor power required by the centrifugal fan is relatively large when the air inlet of the centrifugal fan and the fan box are fully opened. If the air inlet is fully opened, it will easily cause damage to the motor, so the fan can close the air inlet or the valve on the outlet official road during the test run of the fan, and gradually open the valve after running until the required working condition is reached, and Pay attention to whether the operating current of the fan exceeds the rated current.
Whether it is encountered in the process of debugging or use, we can solve it through appropriate adjustments. Let’s take a look at how to solve some common faults!
2) Solutions to common faults of centrifugal fans
1. When using the centrifugal fan, if the startup fails or the startup time is too long, it is necessary to check the problem: if the rated power of the motor is too low, the motor needs to be replaced; if the motor cannot be dragged, the Check the setting of the safety mechanism; if the power consumption is too large when starting, check whether the gas flow control mechanism is in the closed position when starting; if the starting procedure is not correct, the starting equipment needs to be adjusted.
2. If the rotor is stuck, you can use the fan to check the cause of the jam, whether it is because of friction or obstacles, so as to solve it in a targeted manner.
3. When the voltage at the wiring of the motor is too low, check the voltage of the power line. If the loss is too large, increase the power line.
4. If the fan vibrates, the speed of the fan can be directly reduced.
After the above introduction, it can be seen that the debugging steps of the centrifugal fan include selecting the starting method, checking before the test, starting the test run, paying attention to the starting sequence, measuring the input current, and debugging the air inlet. In case of various abnormal conditions such as fan vibration, it is necessary to stop the machine for inspection, analyze the cause and solve it, and pay attention to the correct operation in the subsequent use, which can effectively reduce the occurrence of the failure rate.
