Yaskawa MP940 Reference Manual - Manual (Page 327)

MotionSuite™ MP940 Machine Controller Reference Manual MP940 Module Battery
8-3
MP940 Module Battery
One replaceable battery is integrated into the MP940 module. This battery is for back-
up purposes so that programs and data stored in the MP940 module are not lost in a
power outage (when the power supply to the MP940 module is cut OFF).
Battery Life
The internal battery can perform power loss backup of memory content for
up to one year of total power loss time. The battery storgae life is five years.
These values can differ however, according to ambient temperature and
usage conditions.
Change the battery (model: BA000518) within two weeks when the “BAT”
display light is ON on the MP940 module. Delay in replacing the battery
results in loss of the programs and data stored in the MP940 module memory.
If two weeks have passed since the “BAT” light has gone ON, replace the
battery (Model: BA000518) immediately.
The above explanation presupposes the following:
² This occurs when the “BAT” light is ON prior to continuous rest, and power is cut off
during the continuous rest so that the “BAT” display lights up when power is fed again
after the rest period.
Changing the Battery
The method for changing the battery is shown below.
Saving Memory Content
Prior to changing the battery, save the programs and data stored in the MP940
module memory to floppy disk or hard disk. The saved programs and data are
used if the programs and data are mistakenly deleted due to a mistake in the
battery change operation.