2. Try not to connect inductive loads. Because the starting current of inductive loads often exceeds 3-4 times the rated current, it can cause instantaneous overload of UPS and affect its lifespan. Inductive loads include computer room air conditioning, commonly used electric fans in summer, refrigerators, motors, laser printers, etc. If necessary, the UPS capacity can be appropriately increased.
3. Not suitable for full load or excessive light load. Try not to use the UPS according to its rated power, and do not think that an empty interface should not be idle and connected to other electrical appliances. Long term full load can cause overheating of the UPS inverter and rectifier filter, which will directly affect the service life of the UPS. In general, the load capacity of an online UPS should be controlled between 70% and 80%, while the load capacity of a backup UPS should be controlled between 60% and 70%. Similarly, it is not advisable for UPS to operate under excessive light load conditions. Because the UPS load is too light, it may cause deep discharge of the battery during power outages, which will significantly reduce the service life of the battery and instead cause premature damage to the UPS battery.
4. Maintenance of batteries. A very important component of UPS is the battery pack. At present, most UPS systems use valve regulated maintenance free lead-acid batteries that do not require maintenance. Although they may not require maintenance on the surface, poor care can still cause problems. Moreover, these batteries are expensive. Data from UPS maintenance departments shows that about 30% of UPS damage is actually caused by battery failure. Therefore, the key to maintaining UPS is to maintain the battery. By comparison, batteries are relatively delicate and require operation in an environment of 0-30 ℃. The highest efficiency occurs at 25 ℃, and the battery life decreases by half for every 10 ℃ increase in temperature. Therefore, special attention must be paid to the working environment of UPS in winter and summer. High temperatures will shorten battery life, while low temperatures will not achieve the nominal delay. When batteries with reverse voltage, high voltage drop, large pressure difference, or acid mist leakage are found in the battery pack, corresponding methods should be used to restore and repair them in a timely manner. For those that cannot be restored or repaired, they should be replaced. However, batteries of different capacities, performances, and manufacturers should not be used together, otherwise it may have adverse effects on the entire battery pack. Battery packs with expired lifespan should be replaced in a timely manner to avoid affecting the host.
5. Regular maintenance. Under normal use, the maintenance work of the UPS power supply is minimal, mainly focused on dust prevention and regular dust removal. Especially in areas with dry climate, there is a lot of dust in the air. The fan inside the machine will bring the dust into the machine and deposit it. When the air is humid, it will cause the control system of the host to malfunction and trigger false alarms. A large amount of dust will also cause poor heat dissipation of the components, affecting the service life of the equipment. Generally, the UPS system should be thoroughly cleaned once every quarter. Secondly, during dust removal, it is also necessary to check for any looseness or loose contact between the connecting and plug-in components. Additionally, it is recommended to measure the terminal voltage of the battery every six months and promptly address any issues that may arise. For areas where power outages are not frequent, it is recommended that users turn off the mains power every three months or so and allow the UPS battery to discharge the load once to ensure battery activity. If the battery is not discharged for a long time, not only will its capacity be reduced due to sulfurization, but it will also cause the UPS battery to instantly fail to output sufficient current, causing the load to drop. Generally, manual discharge only requires releasing 30% to 50% of the rated capacity of the battery pack. During the discharge process, excessive or minimal current discharge should be avoided as much as possible, and the discharge voltage should not be lower than the termination voltage of the battery to avoid deep discharge of the battery. Based on actual load calculation, the artificial discharge time should be controlled at (30%~50%) x rated capacity of the battery pack: actual load capacity. Regular maintenance also has an important task, which is to keep good inspection records. A large number of user operation practices have shown that if users can perform orderly maintenance operations and timely UPS operation record checks, they can ensure that the UPS is always running in the best state. Regular and timely observation of operation and maintenance records can also help us detect hidden dangers or signs that may lead to serious accidents early.