The electric fan doesn't work at home. In most cases, the capacitor is broken. Today, let's get to know the capacitor on the fan. Let's see how to allocate capacitance according to the power of the fan. How to judge the quality of capacitance?
First, let's take a look at the above information. CBB is a non-polar polystyrene capacitor, 61 is its model, 1.5UF is its capacity, and 5% plus or minus is its capacity error. SH indicates that it is a self-healing capacitor. 450VAC indicates that its withstand voltage value is AC 450V, 50/60HZ is the frequency of the working power supply, 25/70/21 is its working environment, and it can work normally between low temperature minus 25 ° C and high temperature 70 ° C. 21 is the number of days of the test under constant humidity conditions, and C corresponds to its level. CBB61 capacitor has three levels, A, B, and C, which correspond to the capacitor life, which is 3000h for C, 10000h for B, and 30000h for A respectively. P0 is its explosion-proof grade. If the following number is 0, it must not be explosion-proof. If it is 1,2, it is the corresponding grade.
Generally, three wires are reserved for the motor. Use a multimeter to measure the resistance in pairs. The two wires with the largest resistance are directly connected to the capacitance.
If the fan does not rotate, it is confirmed that the capacitor is broken. You can add another one according to the model of the bad capacitor. If there is no capacitor, you can refer to the value I give.
The electric fan of about 40W can use a capacitor of 1-1.5UF, the electric fan of about 70W can use a capacitor of 2UF, and the electric fan of about 180W can use a capacitor of about 3UF. If the capacitance is too small, it will burn the motor, and it will not start up. It is OK as long as it does not exceed 20% of the standard capacitance.
Discharge before measuring. These are small capacitors that can be touched quickly. After the discharge, turn the multimeter to the capacitance position and directly contact the red and black probes with each pole to measure the capacity. If the capacity is abnormal or greatly reduced, it needs to be replaced.