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8 MAINTENANCE AND INSPECTION
8.3 Battery
119
8
3. Extract the old battery from the battery holder ("B" in figure below), and disconnect the battery connector ("C" in figure
below).
4. Install the new battery. (Page 116 Battery attachment)
5. Attach the expansion board connector cover. If an expansion board was removed in step 2, reinstall it.
• 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
Special relay for low battery voltage
Prepare a system which allows constant external monitoring of the battery status, using a GOT, etc.
• SM52 (SM8005)
The special relay turns ON when the battery voltage is the specified value or less.
The special relay turns OFF when the battery voltage is normal.
• SM51 (SM8006)
The special relay turns ON when the battery voltage is the specified value or less.
The special relay stays ON even when the battery voltage is normal.
• SD8005
Battery voltage can be monitored.
C
B
FX3U-32BL
LOT.14X
…………
Connector
Type
Nameplate
LOT
14X
Year (Example: 2014): Last two digits of year
Month (Example: October):
1 to 9 = January to September,
X = October, Y = November, Z = December
SM52(SM8005)
Battery low-voltage
Y1 is output when a battery low-voltage condition occurs.Y1