(1) 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 are more dust particles in the air. The fan inside the machine can bring dust into the machine for deposition. When the air is humid, it can cause the control of the host to be disrupted, resulting in abnormal operation and inaccurate alarms. A large amount of dust can also cause poor heat dissipation of the components. Generally, it should be thoroughly cleaned once every quarter. Secondly, during dust removal, check for any looseness or loose contact between the connecting and plug-in components.
(2) Although maintenance free batteries are currently used in energy storage battery packs, this only eliminates the need for measuring ratios, proportioning, and regularly adding distilled water in the past. However, the impact of external working conditions on the battery has not changed, and the impact of abnormal working conditions on the battery has not changed. This part of maintenance and repair work is still very important, and a large amount of maintenance and repair work for UPS power systems mainly focuses on the battery part.
A The operation of energy storage batteries is entirely in float charging state, in which case they should be discharged at least once a year. Before discharging, the battery pack should be evenly charged to achieve the balance of the entire battery pack. Be clear about the outdated batteries that existed in the battery pack before discharge. If one reaches the discharge termination voltage during the discharge process, the discharge should be stopped and the lagging battery should be eliminated before continuing the discharge.
B Verification discharge is not about first pursuing the percentage of discharge capacity, but about paying attention to discovering and handling outdated batteries, and conducting verification discharge experiments after processing them. This can prevent accidents and prevent backward batteries from deteriorating into reverse polarity batteries during discharge.
C Normally, each group of batteries should have at least 8 labeled batteries as a reference for understanding the working condition of the entire battery pack. The labeled batteries should be measured regularly and recorded.
D The items that need to be checked regularly in daily maintenance include: cleaning and detecting the voltage and temperature at both ends of the battery; Check for looseness and corrosion at the connection point, and assess the pressure drop of the connecting strip; Whether the appearance of the battery is intact, whether there is shell deformation and leakage; Is there any acid mist escaping around the pole and safety valve; Is the host device functioning properly.
E The maintenance of maintenance free batteries is not groundless. It should be approached from a broad perspective of maintenance, achieving thoughtful, meticulous, and standardized operation and daily management to ensure that equipment (including host equipment) maintains good operating conditions and extends its service life; Ensure that the DC bus regularly maintains a qualified voltage and battery discharge capacity; Ensure battery operation and personnel safety and reliability. This is the purpose of battery maintenance, as well as the content and rules included in the battery operation regulations.
3) When the UPS battery system malfunctions, the cause should be identified first to distinguish between the load and the UPS power system; Is it the host or the battery pack. Although the UPS host has a fault self checking function, it is located on the opposite side rather than on the same point, making it convenient to replace parts. However, to repair the fault point, a lot of analysis and testing work still needs to be done. In addition, if there is a malfunction in the self checking part, the displayed fault content may be incorrect.
4) For faults such as breakdown, fuse failure, or component burnout of the host, it is necessary to identify the cause and eliminate the fault before restarting, otherwise the same faults will occur repeatedly.
5) When batteries with reverse voltage, high voltage drop, large pressure difference, and 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 connected together, otherwise it may have adverse effects on the entire battery pack. Replace expired battery packs in a timely manner to avoid affecting the host.