How to measure air conditioner indoor fan wiring with a multimeter
The indoor fan of household fixed-frequency air conditioners generally uses a single-phase AC motor to serve as the driving force for the cold/hot exchange of the indoor cold susceptor or evaporator. The input voltage is 220V from the mains and the power is between 15 and 25W, which is configured according to the size of the air conditioner model.
In order to provide large, medium and small different air volume, it taps way in the coil winding to regulate the speed. The high, medium and low speeds of the fixed-frequency air conditioner are controlled by three miniature DC relays, which are programmed in the electronic board to indicate one of the actions. But they control the output voltage is 220 V. The speed of the fan is regulated by the coil connected in series inside the motor.
This is done by embedding speed-regulating windings in the stator core slots of the motor as appropriate, and these speed-regulating windings can be in the same slots as the main windings. Whether it is the same slot with the main winding, or the same slot with the secondary winding speed control winding is always in the upper layer of the slot. The working principle of this kind of motor is, in essence, to change the strength of the stator magnetic field, as well as the ellipticity of the stator magnetic field, to achieve the purpose of changing the motor speed.
For this type of motor with a wiring diagram labeled on the motor case, it is sufficient to look at its wiring diagram, because in the circuit wiring diagram, the color of the wires is also clearly labeled. The labels of indoor fans are generally not easy to damage or see clearly, just to the right number.
This motor has five wires, of which white is the common wire, which is connected to the capacitor with the yellow wire, A winding coil for the main winding coil, which is connected in series with black ~ gray, gray ~ red two sets of coil winding, red ~ yellow winding coil for the secondary winding coil, the capacitor is always connected to the yellow wire together. When the white~black wire is connected to 220V power supply, the fan is high speed, when the white~gray wire is connected to 220V power supply, at this time, the speed of the motor is medium speed, and when the white~red two wires are connected to 220V power supply, then it is running at low speed. Air conditioning indoor fan brand is too much, its color is not the same, if the fan's label can not see the wiring schematic, which requires a multimeter dialed to the R × 1 gear, measuring fan, the resistance value of the resistance value between them with the resistance value comparison method. Because they are all in series, so one wire as the basis, with the other four wires to measure, any measurement of the resistance value between them the largest, it means that at this time the two wires for the wire connected to the capacitor. One of them here is certainly a public line, at this point you can assume that one of them is a public line, and then use the resistance file to measure its resistance value, the resistance value of the running winding than the resistance value of the secondary winding coil is small, at this point you can determine the running winding, high, medium, low in fact, the resistance value between them than the resistance value of the coil of the main winding and the secondary winding coil is small, and then the resistance value will be a little bit larger than the medium-speed power line, the secondary winding that One end of the resistance value is a little larger for the low-speed gear wires.
According to this method is no way out, although a little trouble, but is one of the effective way.
