6. Pay attention to lightning protection. Lightning strikes are the natural enemy of all electrical appliances, and it is important to ensure effective shielding and grounding protection of UPS. In addition, the UPS should be placed in a well ventilated and well cooled area.
7.UPS should generally be maintained once every 1-2 years. The long-term machine should be discharged to automatic shutdown once a year to better understand the battery status.
8. Large UPS should generally sign a warranty contract with the service provider, which can effectively save maintenance costs and improve power safety. When UPS malfunctions, it is necessary to record the fault symptoms and approximate location in detail, which is very helpful for quickly restoring power supply and maintenance.
Common UPS fault handling
As a relatively mature and reliable power supply system, UPS has a relatively low probability of encountering problems in our daily work. However, sometimes unpredictable situations may still cause UPS failures. In this case, what we need to do is to integrate various information and quickly restore the normal operation of UPS, striving to minimize losses. In general, we can roughly follow the following steps to handle it:
1.Firstly, analyze the fault phenomenon. Based on the sound of the buzzer, the flashing of the working status indicator light, the presence or absence of power output, and user usage and maintenance information, refer to the maintenance manual provided by the manufacturer to analyze the fault and determine whether it is a fault in the inverter or the mains power supply. At the same time, we also need to analyze the characteristics and circuit principles of the faulty UPS power supply to quickly locate the fault.
2. Disassemble the machine for visual inspection. If necessary, we can conduct a disassembly inspection of the UPS (please notify the manufacturer’s service personnel to be present during the disassembly inspection), check whether the cable connection plugs are loose, whether there are any abnormal conditions on the surfaces of various components, such as whether there is any special odor, whether the fuse is blown, and whether there are any phenomena such as wire breakage, soldering failure, or poor contact.
3.If there is a fault in the mains power supply circuit, it can be checked step by step from the input stage to the rear, or from the rear to the front. The inspection route is carried out in the order of input AC mains voltage, automatic voltage stabilization control circuit, anti-interference control circuit, relay switch matrix, conversion control circuit, and output circuit.
4.If there is a fault in the inverter power supply circuit, the inspection route should be carried out in the order of battery terminal voltage, final push-pull driving transistor, battery group fuse and automatic protection circuit, pulse width modulation component, relay switch matrix, and output circuit. Based on daily maintenance experience, the probability of faults caused by low battery terminal voltage is relatively high. In such cases, we can prioritize measuring the battery terminal voltage for confirmation.