Mitsubishi Electric Melsec-Q172DCPU User Manual page 202

6 INSPECTION AND MAINTENANCE
Replacing Battery
Turn on the Multiple CPU system
power supply for 10 minutes or longer.
Turn off the Multiple CPU system
power supply.
Remove the encoder cable from
Q172DEX.
Remove the Q172DEX from the base
unit.
Disconnect the lead connector from
the battery connector. Remove the
old battery from its holder of the
Q172DEX.
Install a new battery into the holder in
the correct direction. Connect the
lead connector to the connector
(COM4).
Install the Q172DEX to the base unit.
Connect the encoder cable to the
Q172DEX.
Turn on the Multiple CPU system
power supply.
END
(2) Q172DEX module battery replacement procedure
When the battery has been exhausted, replace the battery with a new one in
accordance with the procedure shown below.
POINT
When replacing the battery, pay attention to the following.
(1) The Multiple CPU power supply must be on for 10 minutes or longer before
dismounting the battery.
(2) Encoder data in the memory are backed up for a while by a capacitor even
after the battery is removed. However, since data in the memory may be
erased if the time for replacement exceeds the backup time shown the
following guaranteed value, replace the battery quickly.
• Backup time by capacitor : 3 minutes
Side of the Q172DEX
Connector for battery
Battery
(A6BAT/MR-BAT) connection (CON4)
6 - 13
Front
Encoder cable