Battery Replacement Procedure - Mitsubishi Electric MELSEC iQ-R Series Configuration Manual

Battery replacement procedure

When the life of the battery comes to an end, replace the battery, following the procedure below.
Power on the programmable controller for ten minutes or longer before removing the battery from the CPU module. Power off
the programmable controller, and then replace the battery.
The CPU module holds the data on the device/label memory for three minutes (backup power time) by the capacitor even
after the battery is removed. Note that the data on the device/label memory may be erased if the backup power time is
exceeded. Replace the battery within three minutes.
Replacement procedure for the Q6BAT
(1)
(3)
(2)
1.
Back up the program and data.
2.
Power off the programmable controller.
3.
Remove the CPU module from the base unit.
4.
Open the battery cover located on the bottom of the CPU
module.
5.
Disconnect the connector plug of the Q6BAT from the jack of the
CPU module. When disconnecting the connector, hold the
connector part so that the cables are not damaged.
6.
Remove the Q6BAT from the battery cover.
7.
Set a new Q6BAT to the cover in the right direction (with the
positive terminal of the battery facing the connector holder).
8.
Securely insert the connector plug of the Q6BAT to the jack of the
CPU module. Set the connector (1) to the connector holder (2) on
the cover.
9.
Close the battery cover (3).
10.
Mount the CPU module back on the base unit.
11.
Power on the programmable controller.
12.
Using the engineering tool, check that SM51 (Battery low latch) is
off.
If SM51 is off, the battery has been replaced successfully.
If SM51 is on, the battery may not be installed properly. Repeat the
procedure from step 2. If SM51 remains on, the possible cause is a
hardware failure of the battery. Perform the procedure with a different
battery.
6 MAINTENANCE AND INSPECTION
6.2 Periodic Inspection
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