1、 Maintenance points and cycles
1. Daily inspection (daily/weekly)
Check the appearance status, load and temperature, battery status, and connection lines of the content.
2. Regular maintenance (monthly/quarterly)
Monthly maintenance:
Short delay UPS: discharge with load to 20% -30% of battery capacity (about 5-10 minutes), verify inverter and battery performance.
Long delay UPS: Conduct a deep discharge test once every quarter (discharge to 50% -80% of capacity) to activate battery activity (be careful to avoid overdischarging).
Cleaning and dust removal: Use a dry brush or compressed air to clean the dust inside the UPS and fan filter (avoid wiping with water).
Battery charging and discharging test:
Record data: Save parameters such as load curve, battery voltage, charging current, etc., and compare them with historical data to determine trends.
Annual maintenance:
Fan: UPS that has been running for more than 5 years should check the wear of the fan bearings and replace them if there is abnormal noise.
Capacitor: The lifespan of electrolytic capacitors is about 8-10 years, and they must be replaced when they swell or leak (to avoid short circuits).
Inverter output waveform detection (pure sine wave distortion should be less than 5%).
Internal resistance test of battery pack (replacement is required when the increase in internal resistance of a single lead-acid battery exceeds 30%).
UPS efficiency test (the full load efficiency of online models should be greater than 92%).
Professional testing: Invite original factory engineers for a comprehensive physical examination, including:
Replace vulnerable parts:
3. Battery lifecycle management
Lead acid battery:
Charging and discharging rules: Avoid long-term full charge storage (discharge to 50% before charging for more than 3 months), regularly replenish distilled water (only distilled water with purity ≥ 99.5% can be used, tap water cannot be used).
Life assessment: When the terminal voltage of the battery pack drops rapidly during discharge (e.g. the time for a nominal 12V battery to discharge below 10.5V is reduced by 30% compared to the last time), it needs to be replaced as a whole.
Lithium battery:
Prohibition of overcharging and overdischarging: The built-in BMS (Battery Management System) will automatically protect without manual intervention.
Long term storage: Recharge every 6 months after fully charged, with a storage temperature of ≤ 30 ℃.
2、 Establish a "UPS Maintenance Archive" to record in detail:
Equipment model, serial number, installation date, warranty period.
The time, content, replacement parts list, and test data (such as battery internal resistance and load rate) for each maintenance.
Fault handling records (including fault symptoms, causes, solutions, and time consumption).
Function: Track the health status of devices through historical data, predict faults in advance (such as arranging replacement in a timely manner when battery internal resistance increases year by year), and reduce the risk of sudden shutdown.
summarize
The installation and maintenance of UPS should follow the principle of "environmental priority, standardized operation, and prevention first":
Installation phase: Ensure that the environmental temperature and humidity, ventilation, and grounding meet the requirements, the hardware connections are firm, and the testing process is complete.
Maintenance phase: Through daily inspections and regular in-depth maintenance, potential hazards such as battery aging and poor heat dissipation can be detected in a timely manner to prevent minor problems from escalating into system failures.
Management level: With the help of intelligent monitoring software (such as SNMP remote management) and comprehensive maintenance records, visual management of the entire lifecycle of UPS can be achieved, maximizing equipment lifespan and ensuring business continuity.
