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5. Maintenance and Inspection
When maintaining connected equipment, turn off the Power Switch of this
unit to stop it.
● Even if you disconnect the AC Input Plug while the UPS is operating, the power output of the
BX75XS2 is not stopped and 100 VAC is supplied from the outlet.
Do not disassemble, repair, or modify the unit.
● Doing so may cause an electric shock or a fire.
If liquid leaks from this unit, do not touch the fluid.
● Doing so may cause blindness or burns.
● If it touches your eyes or skin, wash it out with lots of clean water and consult your doctor.
Do not discard this unit into fire.
● The lead battery in this unit may explode or dilute sulfuric acid may leak.
5-1 Checking the battery
The sealed lead battery used in the UPS has its life.
(The life varies depending on your storage/use environment and backup frequency.)
The nearer the end of the life is, the more rapidly deterioration proceeds.
• Although you can judge the life by the auto battery test (page 23), if you want to judge it more accu-
rately, check the battery following the procedure below.
1. Life of battery (estimated replacement timing)
Ambient temperature
20°C
30°C
2. Method to check the battery
See also
Measure the backup time according to "7-1 Measuring method of the backup time."
➛ Page 33
If the measured value is equal to the "initial value of the backup time" or less than half the value obtained
from the graph of "Estimated backup time" on page 35, replace the battery.
• When you compare the "initial value of the backup time" you measured and the current backup time,
make the capacity of devices connected to the UPS same as when you measured the initial value to
make judgment accurately.
3. Guideline on the frequency of checking the batter (measuring the backup time)
Ambient temperature
20°C
30°C
* The battery deteriorates even if it is stored. The higher the temperature is, the shorter the
life becomes.
Replacement estimation
Life of battery
4 years after staring use
4 to 5 years
2 years after staring use
2 to 2.5 years
Check at intervals of 6 months
Until 3 years from purchase
Until 1.5 years from purchase
Caution
(maintenance and discarding)
Check at intervals of 1 month
From after 3 years
From after 1.5 years
25
5. Maintenance and inspection
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