Battery Replacement - Mitsubishi Electric MELSEC iQ-F Series User Manual

Battery replacement

When the battery voltage is reduced, replace it following the procedure below.
Note the following before replacement work.
• Turn on the power supply of the programmable controller for more than 10 seconds.
• Back up the data of the CPU module with the engineering tool.
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 5 and 6 must be completed within the power interruption time (20
sec). When 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 on.
2.
Back up the data of the CPU module with the engineering tool.
3.
Turn the power supply off.
4.
Remove the cover.
• FX5U CPU module
Remove the expansion board connector cover (A in the right
figure). When an expansion board is installed, remove it.
• FX5UC CPU module
Remove the battery cover (A in the right figure).
16 MAINTENANCE AND INSPECTION
264
16.2 Periodic Inspection
A
5
2
A 2
5