Fanuc Power Mate i-D/H Operator Manual

(2) Power Mate i main unit battery
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”
appear on the CRT or LCD display and the battery alarm signal BAL
<F001#2> 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 one or two weeks, however, this depends on the
system configuration.
If the CRT and LCD are not connected regularly, use the BAL signal
to display on the machine operators panel.
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. Before doing this, save the data to a
storage, such as a memory card or floppy disk.
When replacing the memory backup battery, do so while the control
unit is turned off.
The following two kinds of batteries can be used.
Lithium battery built into the Power Mate i control unit.
Two alkaline dry cells (size D) in the external battery case.
A lithium battery is installed as standard at the factory.

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