Mitsubishi Electric MELSEC Q Series User Manual page 199

4 SET-UP AND PROCEDURE BEFORE OPERATION
Battery replacement
Power off the programmable controller.
Remove the web server module from
the base unit.
Open the cover of the web server
module.
Remove the old battery from its
holder.
Insert a new battery into the holder
correctly. Connect the lead to the
connector.
Close the cover of the web server
module.
Mount the web server module onto
the base unit.
Power on the programmable controller.
Monitor buffer
memory address 7 to check the
ON/OFF status.
The web server module battery is
faulty.
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(3) Web server module battery replacement
When the Web server module battery has been exhausted, replace the battery
with a new one according to the procedure shown below.
The programmable controller must be powered on for 10 minutes or more before
removing the battery.
Even if the battery is removed, the memories are backed up by the capacitor for
a while. However, if the replacement time exceeds the limit specified in the table
below, data stored in the memories may be erased. To prevent this, replace the
battery quickly.
OFF
ON
Battery
Completed
MELSEC-Q
Backup time by capacitor
Backup time by capacitor [min]
3
Battery connector
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