
MAINTENANCE
1. METHOD OF REPLACING BATTERY
B–63124EN/01
672
One battery unit can maintain the current position data held in an absolute
pulse coder for about one year.
When the battery voltage falls, APC alarms 306 to 308 are displayed on
the screen. When APC alarm 307 is displayed, replace the battery as soon
as possible. In general, the battery should be replaced within one or two
weeks of the alarm first appearing. This, however, depends on the number
of pulse coders being used.
If the battery voltage drops any further, the current positions for the pulse
coders will be lost. Turning on the power to the control unit in this state
results in APC alarm 300 (reference position return request alarm) being
issued. Return the tool to the reference position after replacing the battery.
The battery for the built–in absolute pulse coder is installed in the servo
amplifier. For an explanation of the replacement procedure, refer to the
FANUC CONTROL MOTOR AMPLIFIER α Series Maintenance
Manual.
1.3
BATTERY FOR
SEPARATE
ABSOLUTE PULSE
CODERS