
B–63503EN/02
4. POWER SUPPLY CONNECTION
40
Part programs, offset data, and system parameters are stored in CMOS
memory in the control unit. The power to the CMOS memory is backed
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. This battery can
maintain the contents of memory for about a year.
When the voltage of the battery becomes low, alarm message “BAT”
blinks on the CRT display and the battery alarm signal is output to the
PMC. When this alarm is displayed, replace the battery as soon as
possible. In general, the battery can be replaced within two or three
weeks, however, this depends on the system configuration.
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 910 (SRAM parity alarm) to occur because the contents of
memory are lost. Clear the entire memory and reenter data after replacing
the battery.The power to the control unit must be turned on when the
battery is replaced. If the battery is disconnected when the power is turned
off, the contents of memory are lost.
Observe the following precautions for lithium batteries:
WARNING
If an unspecified battery is used, it may explode.
Replace the battery only with the specified battery
(A02B–0177–K106.)
Dispose of batteries used in accordance with the applicable laws of your
country or the applicable laws or regulations of your local self–governing
body. Before disposal, insulate the terminals with tape or something
similar to prevent them from being short–circuited.
1 Use a litium battery (ordering drawing number :
A02B–0177–K106)
2 Turn on the Series 0i.
3 Remove the battery case from the front panel of the power supply unit.
The case can be removed easily by holding the top and bottom of it and
pulling.
4.4
BATTERY
4.4.1
Battery for Memory
Backup (3VDC)
Replacing the battery