Mitsubishi MELSEC-Q Series User Manual page 182

5
SETTINGS AND PROCEDURES BEFORE OPERATION
(2) Life of C Controller module battery (Q6BAT)
time ratio
If the battery is not replaced after battery error occurrence, the data in the standard ROM
or battery-backed-up RAM and the clock data may be corrupted, or a file system error
may occur.
5
- 34 5.7 Battery Specifications, Installation and Replacement
5.7.3 Replacing battery
The following indicates the life of the C Controller module battery.
Power-on
Guaranteed value
*1
(70 )
18,000 hr
0%
2.05 years
25,714 hr
30%
2.93 years
36,000 hr
50%
4.10 years
43,800 hr
70%
5 years
43,800 hr
100%
5 years
* 1 The power-on time ratio indicates the percentage of power-on time in a single day (24 hours).
(The power-on time ratio is 50% when the total power-on time is 12 hours and the total power-off
time is 12 hours.)
* 2 The guaranteed battery service life; equivalent to the total power failure time that is calculated
based on the characteristics value of the memory (SRAM) supplied by the manufacturer and
under the storage ambient temperature range of -25 to 75
to 55 ).
* 3 The actual battery service life; equivalent to the total power failure time that is calculated based on
the measured value and under the storage ambient temperature of 40
for reference only, as it varies with characteristics of the memory.
* 4 The guaranteed time after power-off is 3 minutes when:
• The battery connector is disconnected, or
• The battery lead is broken.
IMPORTANT
Table5.8 Battery life
Battery life
Actual service value
(Reference value)
*2
(40 )
43,800 hr
5 years
43,800 hr
5 years
43,800 hr
5 years
43,800 hr
5 years
43,800 hr
5 years
Guaranteed time after battery error
*3
occurrence
1,100 hr
45 days
1,100 hr
45 days
1,100 hr
45 days
1,100 hr
45 days
1,100 hr
45 days
(operating ambient temperature of 0
. This value is intended
*4