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5.3 System Maintenance
5.3.1 Unitary Maintenance Operation
5.3.1.1 Routine inspection
a) Check the wiring /circuit breaker/connector
All the wiring, cable, connector should show no sign of loose, burnt, or bad contact, and the
diameter of the wire should match the current it carries.
b) Check the Output voltage
The output voltage is 230V+/-1%, and the output should be stable in eithe voltage or
frequency, the waveform should be clean, with no noise, and minimum distortion (THDv%<2
@ linear load).
c) Check the Battery status
Visual inspection of the battery.
The battery should be placed in an environment with
good ventilation. A clean, cool environment helps lengthen battery lifetime, the
interconnection between batteries should be locked securely; and case of each piece of
battery should show no sign of leakage of acid or deformation.
Voltage of each piece of battery should be checked; if there is any piece that has obvious
voltage Difference (>2V) from the rest. We recommend changing this piece of battery,
because this piece of battery will very likely fail soon.
Execute a Battery test, to check that the battery is not aged and is in good condition.
5.3.1.2 In-depth inspection
Normally, if UPS works in an environment of high dust/humidity/temperature, In-depth
inspection may be needed every one to two years, In-depth inspection requires opening the
cover of the UPS, all the power supply to the UPS should be cut off before opening the
cover of the UPS and the DC-CAP should be discharge before further inspection. Points to
inspect include:
a) Dust/Corrosion
Check if any dust accumulates on the PCB board. Vacuum dust collector is recommended
to remove the dust.
