Judge the quality of air conditioner capacitors

Capacitors are closely related to our lives, such as televisions, LED lights, switching power supplies, etc.The air conditioner is started by the capacitor of the outdoor unit. Do you all know that? If the capacitor is broken, the entire air conditioner will not cool, which is also a common fault that causes the air conditioner to not cool or heat. How should we judge the quality of the capacitor during daily maintenance? If the air conditioner capacitor is broken, it can usually be seen from the appearance.Some capacitors are bulging and leaking, which can be seen from the outside. Some of them require a capacitance meter to measure, because they look good on the outside and must be measured with specific tools.

The method to judge whether the capacitor is good or bad is as follows:

① Very direct and simple method: connect it directly with 220V AC power. You can connect one pole first and touch the other capacitor pin with another power cord. If there are small sparks when touching, you can be sure that the capacitor is charged, which means that the capacitor is not broken.

② Pointer multimeter,you can also use the digital meter to measure capacitance.If you use a pointer multimeter, generally use the R × 1K scale, and connect the test leads to the two poles of the capacitor. At this time, the multimeter pointer will swing and then slowly return to zero or near zero.Such capacitors are good. The larger the capacity of the capacitor, the longer the charging time, and the slower the pointer swings in the 00 direction.If after connecting, the pointer does not move and the resistance displayed is very small and does not move, it is definitely bad.

③ Digital multimeter inspection and measurement.Check with a digital multimeter, set the digital multimeter to the appropriate resistance level, and touch the red test lead and the black test lead to the two poles of the capacitor under test.At this time, the displayed value will gradually increase from 000 until the overflow symbol "1" is displayed.If it always displays 000, it means the capacitor is internally short-circuited. If overflow is always displayed, it may be that the internal poles of the capacitor are open circuited, or that the selected resistance level is inappropriate.

After the capacitor breaks down or opens, it cannot be repaired and can only be replaced with a new capacitor of the same model. The development of science and technology is inseparable from electronic components, and capacitors also shape our high-quality life.