
B–63833EN/03
4. POWER SUPPLY CONNECTION
46
If the voltage of a battery drops, the screen on the LCD flashes. (If a fan
alarm is issued, the screen on the LCD also flashes.) If this status occurs,
replace the battery as soon as possible (within 1 week). FANUC
recommends that each battery be replaced periodically (once a year)
regardless of whether a battery alarm is issued.
The BIOS settings are usually preserved as long as the battery is replaced
according to the following procedure. If they are lost, the following
message is displayed when the power is turned on:
251: System CMOS checksum bad – Default configuration used.
After this, the default BIOS settings are loaded, and the unit restarts
automatically. Before starting machining, check that the current BIOS
settings of the CNC display unit with PC functions in use have been
changed from the default BIOS settings, and resume your settings as
required.
(1)After keeping the CNC display unit with PC functions powered for at
least 5 seconds, turn it off, and enable work to be done from the rear,
for example, by removing the battery section from the panel.
(2)Remove the connector from the lithium battery, and take the battery
out from the battery holder.
(3)Attach the connector (BAT1) to a new battery within 5 minutes, and
put the battery in the battery holder.
(4)Put the CNC display unit with PC functions back into the previous
place.
(5)Turn the power on, and check that no BIOS parameter is lost (no error
is detected at start–up).
NOTE
Be sure to install a new battery within 5 minutes after the old
one is removed from the connector.
4.4.2
Batteries for CNC
Display Unit with PC
Functions (3VDC)