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How to Use Capacitor

Views:12     Author:Jenny     Publish Time: 2019-08-20      Origin:Site

1. The aluminum electrolytic capacitor has a two-polar structure (see the mark on the capacitor body). Pay attention to the polarity when installing, and do not install it. AC or reverse

 

Application of the voltage may cause a short circuit or damage to the capacitor: the polarity in the AC circuit may be reversed or uncertain, so bipolar capacitors are not suitable for AC applications. 

2. The DC voltage applied to the capacitor terminal must not exceed its rated operating voltage. Otherwise, the leakage current will increase rapidly, and thus the capacitor will be damaged, even causing short circuit and open flame. To delay product life, it is recommended to use capacitors at 70-80% of rated voltage. 

3. The ripple current applied to the capacitor must be within the allowable range. If overloaded, the capacitor will be overheated and the electrical performance will be impaired. The machine may be damaged or even cause an open flame. Please note that the sum of the peak value of the ripple voltage and the DC operating voltage must not exceed the rated DC voltage. 

4. The capacitor must be used within the allowable range of its operating temperature. Room temperature operating conditions extend service life. 

5. Capacitors with a casing diameter of 8 mm or more are equipped with a safety valve. In the solder aluminum electrolytic capacitor, the safety valve is usually located at the bottom of the housing, and the bolt aluminum electrolytic capacitor is usually located at the leading end face (cover) of the capacitor. There needs to be enough space around the valve.

 

In order to maintain the best working condition. The recommended sizes are as follows: when d=18~35mm, keep more than 3mm; when d=40mm or above, keep more than 5mm. 


5. Capacitors with a casing diameter of 8 mm or more are equipped with a safety valve. In the solder aluminum electrolytic capacitor, the safety valve is usually located at the bottom of the housing, and the bolt aluminum electrolytic capacitor is usually located at the leading end face (cover) of the capacitor. There needs to be enough space around the valve.

 

In order to maintain the best working condition. The recommended sizes are as follows: when d=18~35mm, keep more than 3mm; when d=40mm or above, keep more than 5mm. 

6. When the internal pressure of the capacitor is too high, the gas will be released through the safety valve, resulting in a gaseous liquid around the safety valve, which is not a leaking electrolyte. 

7. When installing the capacitor on the circuit board, pay attention to the safety valve not facing down. Do not walk any metal or circuit near the safety valve. However, when installing the screw-on run capacitor on the side, make sure that the negative pole is below the positive pole; do not reverse the voltage. Failure to do so may result in excessive pressure, large electrolyte leakage, and possible short-circuit or even open flames. 

8. Capacitors should be stored in normal temperature and non-acidic, non-alkaline normal humidity environment. Exposure to high temperatures, such as direct sunlight, reduces its useful life. Storage in an acidic or alkaline environment will affect the solderability of the leads. 

9. After long-term storage, the leakage current of aluminum electrolytic capacitors may increase. Therefore, it is necessary to apply a rated working voltage of 6-8 hours before use.

 

10, manual welding: a, must be carried out under the specified conditions. Temperature: 350 ° C; soldering iron use time: 3 seconds. b. Make sure that the soldering iron does not touch any part of the capacitor body. 

11. Do not use excessive force on the leads and terminals. After the capacitor is soldered to the PCB, do not move the capacitor or move the PCB by holding the capacitor. Please observe the following rules to prevent excessive pressure on the capacitor: a. Do not tilt or bend the capacitor after soldering. b. Ensure that the product lead-out spacing matches the solder joint spacing on the PCB.


12. The aluminum housing is not isolated from the cathode, so do not place any conductor under the start capacitor on the PCB, as this may cause a short circuit. The housing and the top end of the capacitor for the switching power supply are provided with a high-pressure heat-resistant shrink sleeve to ensure safe use.

13. The leads of capacitors with a case diameter of over 14 mm are not available for fixing.

 

14. Capacitors that come into contact with water, salt water, oil, and other conductive liquids, or when used in a dew condensation state, can cause malfunctions. Capacitors should be avoided in environments with liquids. Clean and bake before use.

15. Do not use or place in an environment containing a gas such as hydrogen sulfide, nitrous acid, sulfurous acid, chlorine, or bromine, or a harmful gas such as ammonia. If the above gas intrudes into the capacitor, it will cause corrosion. Fumigation and insecticide sprays used during import and export can also cause corrosion, so avoid them.

16, can not be placed in the place of ozone, ultraviolet radiation and radiation.

17. Do not use it in places with excessive vibration or shock. If the capacitor falls freely, it will immediately lead to problems such as increased leakage.


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