Kunshan Shengtang ventilation introduction: centrifugal fan commissioning method 

 Centrifugal fan is a complex equipment, mainly composed of air inlet, air valve, impeller, motor and air outlet. In different states, the effect of centrifugal fan is not the same. Therefore, different parts of the operating conditions do not agree, the effect of centrifugal fans will be affected. Commissioning the centrifugal fan to the best state can be started from many aspects. 

 1. The centrifugal fan allows full voltage starting or step-down electric, but it should be noted that the current at full voltage starting is about 5-7 times the rated current, and the step-down starting torque is proportional to the square of the voltage. When the power grid capacity is insufficient, the step-down starting should be used. 

 2. When the centrifugal fan is on trial run, it should carefully read the product manual and 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 out of phase or in the same phase, and whether the capacity of the electrical components meets the requirements. 

 3. There shall be at least two people during the test run. One person shall control the power supply and one person shall observe the operation of the fan. First check whether the rotation direction is correct; After the centrifugal fan starts running, check whether the running current of each phase is balanced and whether the current exceeds the rated current immediately. If there is any abnormal phenomenon, stop the machine for inspection. After five minutes of operation, stop the machine to check whether the fan has any abnormal phenomenon, and then start the machine after confirming that there is no abnormal phenomenon. 

 4. When the two-speed centrifugal fan is being tested, the low speed should be started first to check whether the rotation direction is correct; When starting at high speed, the fan must be stationary before starting, in case of reverse rotation at high speed, which may cause switch trip and motor damage. 

 5. When the centrifugal fan reaches the normal speed, the input current of the fan should be measured whether it 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 supply 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 chassis under certain working conditions when the air inlet is fully open. If the air inlet is fully open for operation, the motor is in danger of damage. 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 running current of the fan exceeds the rated current. In strict accordance with the above debugging methods, the efficiency of the centrifugal fan can reach more than 98%.