
3. INSTALLATION
B–63783EN/01
30
Part programs, offset data, and system parameters are stored in CMOS
memory in the control unit. The power to the CMOS memory is baked up
by a lithium battery mounted on the front panel of the control unit. The
above data is not lost even when the main battery goes dead. The backup
battery is mounted on the control unit at shipping.
When the voltage of the battery becomes low, alarm message “BAT”
blinks on the LCD display and the battery alarm signal is output to the
PMC.
If an alarm is issued, replace the battery within one week. Otherwise, the
contents of the memory will be lost.
If the voltage of the battery becomes any lower, memory can no longer
be backed up. Turning on the power to the control unit in this state causes
system alarm [screen display: RAM parity error (low battery voltage)] to
occur as the contents of memory are lost. Clear the entire memory and
reenter data after replacing the battery.
Before replacing the memory backup battery, the control unit power off.
The following two kinds of batteries can be used.
D Lithium battery built into the main board of the Series 15i/150i.
D Two alkaline dry cells (size D) in the external battery case.
Procedure
(1) Prepare a new lithium battery (A02B–0200–K102).
(2) Turn the control unit on for about 30 seconds.
(3) Turn the control unit off.
(4) Remove the old battery from the top of the main board.
First, remove the claws holding the battery, and then remove the
battery from the battery holder and disconnect the connector.
(5) Replace the battery, insert the battery into the battery holder, and
connect the connectors. Make sure that the battery holder claws are
firmly holding the battery in place.
Lithium battery
Battery holder claw
Memory card
connector
Main board
BAT1
Battery
connector
Fig. 3.8.2 Replacing the lithium battery
3.8.2
Replacing the Battery
for Memory Backup
Replacing the lithium
battery