
MAINTENANCE1. METHOD OF REPLACING BATTERY
B–64134EN/01
712
One battery unit can maintain current position data for six absolute pulse
coders for a year.
When the voltage of the battery becomes low, APC alarms 3n6 to 3n8 (n:
axis number) are displayed on the LCD display. When APC alarm 3n7
is displayed, replace the battery as soon as possible. In general, the battery
should be replaced within one or two weeks, however, this depends on the
number of pulse coders used.
If the voltage of the battery becomes any lower, the current positions for
the pulse coders can no longer be maintained. Turning on the power to
the control unit in this state causes APC alarm 3n0 (reference position
return request alarm) to occur. Return the tool to the reference position
after replacing the battery.
Therefore, FANUC recommends that the battery be replaced once a year
regardless of whether APC alarms are generated.
See Section 7.1.3 for details of connecting the battery to separate absolute
pulse coders.
Obtain four commercially available alkaline batteries (size D).
(1)Turn on the power of the machine (turn on the servo amplifier).
(2)Loosen the screws of the battery case, and remove the cover.
(3)Replace the dry batteries in the case.
Note the polarity of the batteries as shown in the figure below (orient
two batteries one way and the other two in the opposite direction).
Screws
Cover
(4)After installing the new batteries, replace the cover.
(5)Turn off the power to the machine.
WARNING
If the batteries are installed incorrectly, an explosion may
occur. Never use batteries other than the specified type
(Size D alkaline batteries).
1.2
BATTERY FOR
SEPARATE
ABSOLUTE PULSE
CODERS (6VDC)
Replacing batteries