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HSTP3T 15/20KE-C/KEBC-C User Manual
Chapter 5 Maintenance
Chapter 5 Maintenance
This chapter introduces UPS maintenance, including the maintenance instructions of power
module and monitoring bypass module and the replacement method of dust filter.
5.1 Precautions
1. Only certified engineers are authorized to maintain the UPS.
2. The components or PCBs should be disassembled from top to bottom, so as to prevent any
inclination from high gravity center of the cabinet.
3. To ensure the safety before maintaining, measure the voltage between operating parts and
the earth with multi-meter to ensure the voltage is lower than hazardous voltage, i.e. DC
voltage is lower than 60Vdc, and AC maximum voltage is lower than 42.4Vac.
4. Wait 10 minutes before opening the cover of the power module or the bypass after pulling
out from the Cabinet.
5.2 Instruction for Maintaining UPS
For the maintenance of the UPS, please refer to chapter 4.2.4 for the instruction to transfer
to maintenance bypass mode. After maintenance, re-transfer to normal mode according to
chapter 4.2.5.
5.3 Instruction for Maintaining Battery string
For the Lead-Acid maintenance free battery, when maintenance 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 20 ºC to 25ºC. The battery life will
be shortened if the battery is used under high temperature or in deep discharging status.
Refer to product manual for details.
3. Charging/discharging current. The best charging current for the lead-acid battery is
0.1C .The maximum current for the battery can be 0.3C.The suggested discharging
current is 0.05C-3C.
4. Charging voltage. In most of the time, the battery is in standby state. When the utility is
normal, the system will charge the battery in boost mode (Constant voltage with
maximum limited) to full and then transfers to the state of float charge.
5. Discharge depth. Avoid deep discharging; 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 any abnormality of the battery, measure if the voltage of
each battery are in balance. Discharge the battery periodically.
Warning
Daily inspection is very important!
Check and confirm the battery connection is tightened regularly, and make sure there is no
abnormal heat generated from the battery.
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