1. The running current is too large. For the centrifugal fan with high power, it is recommended to use the blood pressure lowering operation;
2. If the load of the cooling fan is too large, the adjustment valve of the duct air supply or the air inlet can be adjusted to a small value;
3. The volume of the power switch is too small, or the adjustment value of the overload protector is unscientific;
4. If the centrifugal impeller rotates in the opposite direction, the rotation direction of the centrifugal impeller should be adjusted immediately;
5. The three-phase five-wire contact phenomenon or the same phase difference causes the phase failure;
6. The characteristics of the control cabinet accessories are poor, or the poor contact of the route causes the centrifugal fan to loosen;
7. Insufficient power grid capacity and reduced working voltage
