How do I start a fan when it is reversed? The forward and reverse wind direction of the fan

Boilers with two supply fans or two induced draft fans often run one day and the other standby fan reverses due to the lax inlet guide vanes. Since the starting current of the asynchronous motor is very large, while the starting torque is small. The inertia of the fan is larger, and the time required for the fan to start to normal is longer, about 50s, when the fan restaurant is, because the direction of rotation of the impeller is opposite to the direction of the rotating magnetic field of the motor nail, the starting current is greater, and the inertia of the impeller is much greater than that when it is stationary, the current and time of the fan start exceed the action current and time set by the current relay for the safety of the motor, so that the reversed fan can not be started.

To start the reversed fan, first stop the reversed impeller, such as working overtime at the inlet of the reversing fan, or use external force (friction) to stop the impeller from rotating, and then start. What situations should stop the operation of the fan immediately: when the fan has strong vibration and severe impact friction.

When the temperature of the fan bearing rises abnormally and exceeds the allowable value. The temperature rise of the motor exceeds the allowable value; When the fan or motor has serious defects, endangering the safety of people and equipment.

When the electrical equipment fails, it is necessary to stop the operation of the equipment. In the event of a personal accident, the fan must be stopped to be rescued. When a fire endangers the safety of the equipment.

What are the inspection items in the operation of the motor: the ammeter indicates that it is stable and does not exceed the allowable value. The sound of the motor is normal, and the vibration and channeling do not exceed the specified value.

The bearing should avoid oil leakage and heating. The oil level of the sliding bearing is within the specified range, and the oil ring is good, and the motor housing should not be overheated. The grounding wire of the shell and the connecting screws of each part should be firm.

Determination of motor insulation resistance: The insulation resistance of a high-voltage motor for one week in a wok during the standby period and a low-voltage motor for more than two weeks during the standby period should be measured before starting or before power transmission.

Because the starting current of the asynchronous motor is very large, and the starting torque is +, the inertia of the fan is larger, and the time required for the fan to start to normal is longer. When the fan is reversed, because the rotation direction of the impeller is opposite to the direction of the rotating magnetic field of the motor stator, the starting current is greater, and the inertia of the impeller is much larger than that when it is stationary, the current and time of the fan start exceed the current current and the time set by the current relay for the safety of the motor, so that the reversed fan cannot be started. To start the reversing fan, first of all, the reversing impeller should be stationary, such as adding a plug plate to the inlet or outlet of the reversing fan, or using external force; (friction) to stop the impeller from rotating and then start again.

Due to the special structure of the impeller, if it is reversed, the efficiency of the induced draft fan is greatly reduced, and it cannot meet the needs of the work at all. The electrical diagram is divided into reversal and positive transmission, which is due to the change of rotation direction due to the constraints of site conditions and the influence of the inlet and outlet of the fan when the induced draft fan is installed, and the angle of the fan impeller blades is also changed, so that two directions are formed. Forward or reverse rotation (i.e. left- or right-handed) is the motor relative to the fan impeller, while the direction of rotation of the impeller itself is fixed.

The forward and reverse rotation of the induced draft fan here refers to the motor, not the impeller. It is determined before installation. After the fan is installed, the motor is not allowed to be reversed.

If the volute or blade of the fan is generally marked with the direction of rotation, the rotation according to the direction marked by the arrow is the positive direction, and the reverse direction is the reverse direction.

Summary. Hello dear, taking Gree air conditioner as an example, the solution to the reversal of the fan in the air conditioner: 1. Reconnect the capacitor line:

First of all, disconnect the power supply of the air conditioner, turn on the panel of the air conditioner, and remove the internal filter. Then, find the electronic control board inside the air conditioner to see the capacitance of the internal fan and the wires connected to the two ends. One is the neutral line of the power supply loop, and the other is the capacitor line.

By reversing the position of the two wires, the internal fan can be turned forward. 2. Replace the motor coil: unplug the power supply of the air conditioner, then open the air conditioning panel, and remove the filter screen and electric control board in it, you can see the position of the internal coil of the motor, replace the burned coil, and install a new click coil.

However, before replacement, you need to use professional testing tools for testing, and then repair it after determining that it is a coil problem. Generally, the motor coil will be burned out because the fan is running abnormally, which makes the internal capacitor heat and shut down. The above two solutions need to be operated under the guidance of professionals, or directly contact the product after-sales maintenance personnel for professional maintenance.

Can you elaborate on that a little bit more?

Hello dear, take Gree air conditioner as an example, the solution to the reversal of the fan in the air conditioner: 1. Reconnect the capacitor line: First, disconnect the power supply of the air conditioner, turn on the panel of the air conditioner and remove the internal filter.

Then, find the electric control board inside the air conditioner to see the capacitance of the fan shed and the wires connected to the two ends. One is the neutral line of the power supply loop, and the other is the capacitor line. By reversing the position of the two wires, the internal fan can be turned forward.

2. Replace the motor coil: unplug the power supply of the air conditioner, then open the air conditioning panel, and remove the filter screen and electric control board in it, you can see the position of the internal coil of the motor, replace the burned coil, and install a new click coil. However, before replacement, you need to use professional testing tools for testing, and then repair it after determining that it is a coil problem.

Generally, the motor coil will be burned out, but the fiber will be shut down due to the abnormal operation of the fan, which makes the internal capacitor heated. The above two solutions need to be operated under the guidance of professionals, or directly contact the product after-sales maintenance personnel to come to the door for professional maintenance. Hope it helps.

The fan didn't reverse when it left the factory, why did it reverse for no reason, what reason did you not make it clear, if it was repaired, it may be the wrong wire. The wrong connection is easy to do, and the solution is as follows:

The air conditioner unit will not be reversed for no reason. It may be that the air conditioner is connected to the wrong wire when repairing, so the blades will be reversed.

The wiring is wrong, or the fan motor is broken.