UPS uninterruptible power supply maintenance and normal maintenance

UPS uninterruptible power supply plays an important role in modern communication power supply, which can extend the life of equipment and ensure data security. The power source of the UPS is the chemical power source it is equipped with, so the quality of the UPS uninterruptible power supply depends on the performance of its chemical power supply, as well as proper use and careful maintenance.

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STAND brand UPS-500 maintenance failure phenomenon A STAND brand UPS-500 uninterruptible power supply shutdown power supply is turned off after a few days of re-boot, only hear the sound of the internal "噼噼啪啪" relay, the normal display of the power supply The lamp (NOR-MAL VAC) does not light up, and the low power supply indicator (BAT-TERY LOW) does not stop. Trouble shooting Open the case check relay and found no problems.

Switching to a relay of the same type is still the same phenomenon when power is applied. Then check the battery. The battery of the UPS power supply consists of two sets of 12V, 7Ah battery packs. The battery was removed for inspection and it was found that some of the cells of one of the batteries had broken and the electrolyte had dried up. The voltage was measured to be 7.2V. The other set looks good and has a voltage of 10.5V. It can be determined that the UPS power supply cannot be started because the battery voltage is too low. Since the housing of one of the battery packs has been broken, it cannot be repaired. The capacity of one of the intact housings is activated. First, the battery is charged at 0.7A, and the voltage rises rapidly. It rises to 15.5V in 5 minutes, and then 0.5A discharge, put the voltage to 9.6V, then charge with 0.5A for 12h, discharge at 0.5A, the time is 5h, the capacity is still 2.5Ah. After several cycles of charge and discharge, the voltage can be increased.

Cyclic charge and discharge were carried out according to the following rules: charging at 0.5 A for 12 h, discharging at 0.5 A to 9.6 V, and performing 5 cycles of charge and discharge. The capacity of 5 cycles of charge and discharge was 2.6 Ah, 2.8 Ah, 3.2 Ah, 4.5 Ah, and 4.8 Ah, respectively. From the above results, the capacity of the battery pack is still likely to rise. Therefore, the following method was used to carry out 5 cycles of charge and discharge. The battery was charged at 0.7 A for 12 h, 0.7 A was discharged to 9.6 V, and 5 cycles of charge and discharge were performed. The capacity of 5 cycles of charge and discharge was 4.9 Ah, 5.5 Ah, 5.6 Ah, 6.2 Ah, and 6.2 Ah, respectively. Since a battery case was broken and could not be used, a battery pack (12V, 7.0Ah) with a similar capacity of 6.2Ah was purchased from the market for more than half a year, and no problem was found.

UPS uninterruptible power supply normal maintenance In order to work properly with the UPS uninterruptible power supply, the following 10 problems should be noted in use. 1. UPS uninterruptible power supply should have appropriate margin in power matching, such as UPS power supply for 800W load, its power should be more than 1000w. 2. UPS uninterruptible power supply should avoid frequent power-on and shutdown, it is best to be on for a long time. 3. The newly purchased UPS uninterruptible power supply should be recharged before use. Because the UPS is continuously self-discharging during the sales process, a large part of its capacity is consumed. If it is not replenished in time, Not only will it affect normal use, but it will also shorten the battery life.

The method of recharging the battery is to connect the batteries in series and charge according to the specific method provided in the battery instruction manual. Generally, constant voltage charging is adopted. The control voltage of each battery is 2.30-2.35V, and the initial current limit should not exceed 0.25C5A (C5 can calculate the specific value by the rated capacity of the battery) to avoid burning the battery. The charging current is sufficient for 3 hours and can be put into use. The charging duration is 12-24h. 4. If the mains supply is always in the normal power supply, the UPS uninterruptible power supply will not have a chance to work, and the battery may be damaged by floating for a long time. Therefore, it is necessary to periodically perform artificial forced work on the UPS uninterruptible power supply that is not used for a long time, so that not only can the battery be activated, but also whether the UPS uninterruptible power supply is in a normal state, and the operator can be familiar with the use of the UPS power supply system.

The UPS uninterruptible power supply should be recharged immediately after use, even if the battery returns to normal. The charging method is: the constant voltage is 2.35~2.40V, and the initial current should not exceed 0.25C5A. In the environment of 25°C, the fully discharged battery needs 18-24h. If the energy is not discharged, it can be terminated according to the continuous current. 6. If the battery of the UPS power supply is not a maintenance-free battery, always check the specific gravity of the solution and the amount of liquid, and add electrolyte or distilled water in time. 7. When the UPS power supply is in use, check the float voltage every month. When the float voltage of a single battery is lower than 2.20V, the entire battery should be balanced. The method is: in the environment of 25 ± 5 ° C, the initial current limit should not exceed 0.25 C5A, the constant voltage is 2.35 ~ 2.40V, and the charge is 24 ~ 48h. 8. If the user configures the long-delay battery pack by himself, the external charger should have constant voltage and constant current functions at the same time. The charger with constant voltage function should not be used to avoid affecting the service life of the battery.

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