FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

Absolute pulse coder battery replacement
When replacing the memory backup batteries, keep the power to the machine (CNC) turned on,
and apply an emergency stop to the machine. Because this work is performed with the power
on and the cabinet open, only those personnel who have received approved safety and
maintenance training may perform this work.
When replacing the batteries, be careful not to touch the high–voltage circuits (marked
fitted with an insulating cover).
Touching the uncovered high–voltage circuits presents an extremely dangerous electric shock
The absolute pulse coder uses batteries to preserve its absolute position.
If the battery voltage drops, a low battery voltage alarm is displayed on the machine operators panel
or CRT screen.
When a low battery voltage alarm is displayed, replace the batteries within a week. Otherwise, the
absolute position data held by the pulse coder will be lost.
Refer to the maintenance section of the operators manual or programming manual for details of the
battery replacement procedure.

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