User`s manual

Battery life and replacement procedure Maintenance and inspection
MELSEC System Q, Hardware 10 – 17
Replacement procedure of the Q6BAT battery
 Turn off the programmable controller power supply.
 Remove the CPU module from the base unit.
 Open the battery cover of the CPU
 Disconnect the battery connector.
 Remove the old battery from its holder.
 Insert a new battery into the holder in the correct direction.
 Connect the lead to the connector.
% Insert the battery holder into the CPU module (not for Q00JCPU, Q00CPU and Q01CPU).
& Install the CPU module into the base unit.
' Turn on the programmable controller power supply.
( Monitor SM51 to verify on/off.
If the special relay is still set, indicating with SD52 a low CPU battery voltage, retry the
replacement. Check the battery voltage. If it is too low for the memory card, the battery must
be replaced (refer to section 10.3.3).
QH00029C
Fig. 10-3: Location of battery Q6BAT
QCPU
CPU module front
CPU module bottom
Holder for connector
Battery Q6BAT
Connector