
2.LCD-MOUNTED TYPE Series 30i HARDWARE B-63945EN/02
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2.8 REPLACING BATTERY
Offset data, and system parameters are stored in SRAM in the control
unit. The power to the SRAM 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 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 to occur because the contents of memory are
lost. Clear the entire memory and reenter data after replacing the
battery.
The following two kinds of batteries can be used.
• Lithium battery built into the CNC control unit.
• Two alkaline dry cells (size D) in the external battery case.
NOTE
A lithium battery is installed as standard at the
factory.
- Replacement procedure
When a lithium battery is used
Prepare a new lithium battery (ordering code: A02B-0200-K102
(FANUC specification: A98L-0031-0012)).
1 Turn on the power to the CNC. After about 30 seconds, turn off
the power.
2 Remove the battery from the rear of the CNC unit.
First, unplug the connector, then take the battery out of its case.
The connector is not latched. Pull the cable to unplug the
connector.
When a unit with no option slot is used, the battery case is
located on the rear of the unit as shown in the figure below.
When a unit with option slots is used, the battery case is located
beside a fan on the top.
3 Insert a new battery and reconnect the connector.
4 Clamp the battery cables as shown in the figure below.