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5. Maintenance
This chapter introduces UPS maintenance, including the maintenance instructions of power part and
monitoring bypass and the replacement method of dust filter.
5.1 Precautions
Only maintaining engineers can maintain the UPS.
1) Wait 10 minutes before opening the cover of the power area or the bypass after pulling out
from the cabinet
2) Use a multi-meter to measure the voltage between operating parts and the earth to ensure the
voltage is lower than hazardous voltage, i.e. DC voltage is lower than 60Vdc, and AC maximum
voltage is lower than 42 Vac.
5.2 Instruction for maintaining UPS
For the maintenance of the UPS, please refer to chapter 4.3.4 to transfer to maintenance bypass
mode. After maintenance, re-transfer to normal mode according to chapter 4.3.5.
5.3. Instruction for Maintaining Battery String
For the Lead-Acid maintenance free battery, when maintaining the battery according to
requirements, battery life can be prolonged. The battery life is mainly determined by the following
factors:
1) Installation. The battery should be placed in dry and cool place with good ventilation. Avoid
direct sunlight and keep away from heat source. When installing, ensure the correct
connection to the batteries with same specification.
2) Temperature. The most suitable storage temperature is 5 ℃ to 25℃, Operating 15-25°C.
3) Charging/discharging current. The best charging current for the lead-acid battery is 0,1C. The
maximum charging current for the battery can be 0,2C (some brand it can be higher). The
discharging current should be 0,05C-3C.
4) Charging voltage. In most of the time, the battery is in standby state. When the utility is
normal, first the system will charge the battery in boost mode, when battery is almost charged
it transfers to the state of float charge.
5) Discharge depth. Avoiding frequent deep discharge, which will greatly reduce the life time of
the battery. When the UPS runs in battery mode with light load or no load for a long time, it
will cause the battery to deep discharge.
6) Check periodically. Observe if is present any abnormality of the battery, measure if the voltage
of each battery is in balance with others. Discharge the battery periodically.
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