Mitsubishi MELSEC iQ-F FX5UC, User Manual

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8 MAINTENANCE AND INSPECTION
8.3 Battery
125
8
Replacement procedure
If the battery voltage is reduced, replace it following the procedure below.
Even with the battery removed, the built-in capacitor holds the data of the memory for the power interruption time (20 sec.).
Battery replacement steps 3 and 4 must be completed within 20 seconds. If the time taken for battery replacement is longer
than the power interruption time, the data of the memory may be lost.
1.
Turn the power supply off.
2.
Remove the battery cover (A in the figure below).
3.
Disconnect the battery connector (B in the figure below) from the old battery, and remove the battery from the battery
holder (C in the figure below).
4.
Install the new battery. (  Page 123 Battery attachment)
5.
Attach the battery cover.
• After replacing the battery, check whether the devices set by the latch and clock data are backed up
correctly, confirm safety, and then run the PLC.
• If the devices set by the latch are not backed up correctly, clear them, and set their initial values and clock
data again if necessary.
Reading the date of manufacture
How to read the battery lot number
A
2
5
B
C
Connector
Model
Nameplate
LOT
1 5 1
Year (Example: 2015): Last two digits of year
Month (Example: January): 1 to 9 = January to September,
X = October, Y = November, Z = December