Lifetime And Replacement Interval Of Backup Battery - Panasonic ELC500 User Manual

3.3.3

Lifetime and Replacement Interval of Backup Battery

■Lifetime of backup battery
Lifetime
3.3 years or more
Lifetime indicated above is the value when no power at all is supplied.
Note that the lifetime in actual use may be shorter than the indicated value depending on the use
conditions.
Backup battery is consumed for the backup battery detection circuit, even while power is being
supplied. Lifetime while power is being supplied is approx. two times longer than the value when no
power is supplied.
■Detection of errors and replacement interval of backup battery
When voltage of the backup battery declines, the system relays (SR24 and SR25) are turned on. As
necessary, create a program for reporting the error to outside.
Promptly replace the battery, though data are retained for about one week from the detection of a
backup battery error, even if no power at all is supplied.
Note
The retained memory data may become indefinite after one week has passed with no
power supplied, from the time when the system relays (SR24 and SR25) turned on or
when ERROR LED on ELC500 flashed.
Regardless of time passed from detection of a backup battery error, supply power to
ELC500 for at least 5 minutes before replacing the backup battery.
Suggested replacement interval
5 years
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ELC500 Control unit