Fanuc Series 15i/150i-MA (Programming) Operators Manual

2.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
and fitted
with an insulating cover).
Touching the uncovered high-voltage circuits presents an extremely dangerous electric shock hazard.
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 operator’s panel or
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 manual for details of the battery replacement procedure.

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