Can the 47 F filter capacitor on the cabinet air conditioner board be replaced by 100 F?

The bypass capacitor is to filter out the interference in the input signal, while the decoupling capacitor is to filter out the interference of the output signal to prevent the interference signal from returning to the power supply. This should be their essential difference. The decoupling capacitor is equivalent to a battery, which avoids the voltage drop due to a sudden change in current, and is equivalent to a filter ripple.

The specific capacitance value can be calculated according to the size of the current, the expected ripple size, and the size of the action time. Decoupling capacitors are generally large and are largely ineffective against higher frequency noise. The bypass capacitor is for high frequencies, that is, the frequency impedance characteristics of the capacitor are used.

However, the bypass capacitor generally refers to the high-frequency bypass, that is, to improve the high-frequency switching noise to improve a low-impedance leakage prevention path. The high-frequency bypass capacitance is generally small, according to the resonant frequency, etc., while the decoupling capacitor is generally larger, 10U or larger, according to the distribution parameters in the circuit, and the change of the driving current to determine.

In this case, it cannot be replaced, the main reason is that their power difference is relatively large, so this aspect cannot be replaced.

If the filter capacitor is larger, it doesn't matter.

The emerald capacitor on the air conditioning panel is illegal if it was originally 47. So now I don't have 100 micro-substitutions, it's completely fine.

Can the 47 F filter capacitor on the cabinet air conditioner board be replaced by 100 F?

Answer: It is not recommended to use it, the capacity difference between the two is too much, and the system is easy to be unstable.

The 47 micro-filter capacitors on the hang-up board can be replaced with 100-bit transmitters.

OK. The maximum applicable power supply voltage for the start-up and operation of the compressor and fan motor of the outdoor unit of the air conditioner is 450V, and it can be used in the range below 450V. In addition, the capacitance capacity of the manufacturer for the compressor and fan motor is the most suitable specification obtained by the manufacturer after a lot of tests in the laboratory, but it is not necessarily the best specification.

In the actual use process, if the power supply voltage of the air conditioner is generally low, the capacitor capacity can be appropriately changed; If the supply voltage is generally high, the capacitor capacity can be appropriately changed to a smaller one. Generally speaking, there is no problem if the capacitor capacity of the manufacturer is up or down by less than 15%.

In the process of using air conditioning, if the air conditioning outdoor unit is installed in the south or southwest direction of the house and is exposed to strong direct sunlight for a long time, you can consider installing an awning above the outdoor unit of the air conditioner, and at the same time, the ventilation around the outdoor unit of the air conditioner should be kept smooth to slow down the aging rate of the capacitor.

Yes, but it must be greater than the original withstand voltage value and should not exceed 35% of the original withstand voltage value

The capacitance of the capacitor cannot be changed, and the withstand voltage is higher than the original withstand voltage.

Pay attention to a few points.

1. The properties of the capacitors should be the same. Particular attention should be paid not to use electrolytic capacitors;

2. The rated voltage of the capacitor should be greater than the one to be replaced;

3. On the basis of , multiple capacitors are allowed to be connected in parallel, so that the total capacity [and] remains unchanged.

Or the total capacity change range is controlled within plus or minus 5%-10%, and it is necessary to test run and verify [current and power measurement].

Change the air conditioner. 1: Use a soldering iron to remove the capacitor.

2: Attach a new soldering iron.

3: Reuse.

Judge the quality of capacitors:

Method 1: The most direct and simple way: connect directly with 220V alternating current, you can connect one pole first, and touch the other capacitor pin with another power cord. If there is a noticeable small spark when touched, you can be sure that the capacitor is charged, which means that the capacitor is not broken.

Method 2: Pointer multimeter, you can also use the capacitance file of the digital meter.

If you use an analog multimeter, generally use the R 1k file, and connect the pen to the two poles of the capacitor. At this point, the multimeter needle will swing and then slowly return to or near zero. Such capacitors are good.

The larger the capacitor's capacity, the longer the charging time and the slower the pointer swings in the 00 direction. If the pointer does not move and the resistance value is rarely displayed and does not move, it is definitely bad.

Method 3: Digital multimeter detection.

Check with a digital multimeter, dial the digital multimeter to the appropriate resistance level, and touch the two poles of the capacitor under test with the red and black pencils. In this case, the display value will gradually increase from 000 until the overflow symbol "1" is displayed. If 000 is always displayed, it means that there is a short circuit inside the capacitor.

If spill is always displayed, it may be that there is an open circuit between the internal poles of the capacitor, or it may be that the selected resistance level is not suitable.

In order to be able to see the charging process of the capacitor from the display, different resistance levels should be selected for the capacitors with different capacitances. The principle of selecting the resistance level is: when the capacitor is large, the low resistance level should be selected; When the capacitance of the capacitor is small, a high resistance level should be selected.

If you inspect a small-capacitance capacitor with a low resistance setting, it is easy to misinterpret the capacitor as an open circuit because the charging time is very short, and the overflow will always be displayed and the change process will not be visible. If a high-capacity capacitor is inspected in a high resistance setting, the measurement time will need to be long due to the slow charging process. For the above capacitors, you can select the resistance level in the following table (the charging time in the table refers to the time required for the display file to change from 000 to overflow).

The selection of the resistance gear when measuring the capacitor, the resistance range (uf) of the capacitor under test (uf) charging time (after the capacitor breaks down or opens the circuit, it cannot be repaired, and only a new capacitor of the same model can be replaced.) In order to facilitate the selection of repairs, the following table lists the selection of capacitor capacity and compressor motor output power for reference. Capacitor capacity and compressor motor output power of the optional compressor motor output power compressor motor output power (W); Capacitor Capacitance (uf.)