7 Maintenance and Inspection
7-2 Replacing the battery
BW40T/BW55T/BW100T/BW120T
39
7
7-1-2 Methods for checking the battery
There are two methods for checking the battery.
- Perform a self-diagnostic test. (See page 31.)
- Measure the backup time. (See page 33.)
By measuring the backup time, the battery life can be determined more accurately.
If the measured value is less than half the value of the "initial value of the backup time,"
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
7-1-3 Guidelines for how often to check the battery
(measure the backup time)
Ambient
temperature
Check once every six
months
Check once a month
25 degrees
Celsius
For the first 3 years after
purchase
When 3 or more years
have passed since
purchase
30 degrees
Celsius
For the first 1.5 years
after purchase
When 1.5 or more years
have passed since
purchase
7-2 Replacing the battery
The battery can be replaced either while the unit is stopped (power supply output
stopped) or while it is in operation (outputting power supply).
* The battery deteriorates even if it is stored. The higher the temperature is, the
shorter the life becomes.
After charging is complete, it is automatically executed.
Caution
When the unit is used in compliance with UL standards, do not replace the battery
while in operation (while power is being output). Replacing the battery while in
operation does not comply with UL standards. Make sure to stop the operation of
the unit before replacing the battery.
* When replacing the battery, stop the connected devices, turn OFF the power
switch of the UPS, and disconnect the AC input plug from the wall.
* If an input power supply error such as a power failure occurs when replacing the
battery while in operation, backup cannot be performed and output stops
* Do not replace the battery during backup operation. Output will stop.