|All Fanuc CNCs
(with the exception of Fanuc model 6 and 11 which utilizes Bubble Memory
Units) uses memory backup batteries to maintain the contents of the CNC's
Random Access Memory (RAM). This is where NC, PMC parameters, part
programs, tool offsets etc are stored.
Fanuc 0, 10, 15 controls uses three 1.5V
D-Cell Alkaline batteries. These batteries are in an enclosure
(click here to view) usually mounted on the machine where it is easily accessible from
outside without having to open the electrical cabinet.
Fanuc 16, 18 (model A, B, C, i series)
controls normal use lithium battery which is connected to the control unit
(click here to view) and located inside the cabinet. However, I have seen on some Fanuc 16/18
controls where machine builder installed an external battery box (as
described earlier for 0, 10, and 15 controls) and you can use regular
Alkaline batteries. Please refer to relevant machine builder's manual
and/or Fanuc manual on battery replacement procedures.
Under normal circumstances, control will
generate a battery low message or alarm if the battery need replacement.
However this message is nothing more than a small display on the bottom
corner of the screen and says something like "batt". It is easy
Most of the time customer will realize that battery has gone low or
sometimes actually went completely dead when machine is shut off for
holidays or weekends. The common symptom will be that you will get a
variation of "RAM parity error" or "System alarm 9xx" depending on
the control model.
Should this occur, the only way to recover
from this situation is to clear memory and reload all the data. Be sure to
refer to relevant Fanuc maintenance for alarm detail and procedures on how
to clear and reload and data and of course you still have to replace the
|Control must be
turned ON when memory battery backup batteries are replaced. This mean
that control screen must be on and not just the machine breaker turned on.
For Fanuc 0, 10, 15 controls where the battery compartment is easily
accessible from outside, battery replacement is relatively easy since you
do not need to open the control cabinet where high voltage present and
risk of electric shock. Just be sure to pay attention to the polarity of
batteries when you are taking them out and putting the new ones in.
If you have Fanuc 16/18 (model A, B, C, i) and
15 (model B, i), then replacing batteries is trickier. The location of the
battery could be any where from behind the CRT/LCD display to inside the
electrical cabinet. Since you will have to replace the battery while the
power is applied to the control, be sure to take all necessary precautions
and the person who is performing the task should be familiar with the
danger involving working around high voltage. Be sure to consult all
relevant machine and control manuals.
Better yet, if you have several Fanuc
controls, schedule a service call to perform data backup and battery
replacement (by the way, to those customers in Houston and surrounding
areas, we at KFAS can schedule "CNC
System Evaluation and Preventative Maintenance Recommendation"