This chapter describes the method of replacing batteries as follows.
2.6.1 Replacing the CNC Battery for Memory Back Up
2.6.2 Replacing the Batteries for Separate Absolute Pulse Coder
2.6.3 Replacing the Battery for Absolute Pulse Coder
(α Series Servo Amplifier Module)
The CNC has a battery to memorize data of part programs, offset data,
system parameters and so on. When the battery was reaching the low
level, the CNC would display
on the screen before losing the
important data in the memory.
When you find the sign
, please replace the battery as Subsec. 2.6.1
within a week. If you do not replace the battery, the data in memory could
When the machine is equipped with absolute encoder. System such as an
absolute pulse coder or absolute linear scale, there is a battery for them
separately from the battery for memory backup.
When you get an alarm message No. 307 or 308 APC alarm, please
replace the battery within a week following the instructions in 2.6.2 or
2.6.3, or the absolute position could be lost and it would be required to
take a procedure of manual reference point return.
Part programs, offset data, and system parameters are stored in CMOS
memory in the control unit. The power to the CMOS memory is backed
up by a lithium battery mounted on the front panel of the control unit. The
above data is not lost even when the main battery goes dead. The backup
battery is mounted on the control unit at shipping. This battery can
maintain the contents of memory for about a year.
When the voltage of the battery becomes low, alarm message “BAT”
blinks on the CRT display and the battery alarm signal is output to the
PMC. When this alarm is displayed, replace the battery as soon as
possible. In general, the battery can be replaced within two or three
weeks, however, this depends on the system configuration.
If the voltage of the battery becomes any lower, memory can no longer
be backed up. Turning on the power to the control unit in this state causes
system alarm 910 (SRAM parity alarm) to occur because the contents of
memory are lost. Clear the entire memory and reenter data after replacing
the battery.The power to the control unit must be turned on when the
battery is replaced. If the battery is disconnected when the power is turned
off, the contents of memory are lost.
Observe the following precautions for lithium batteries:
If an unspecified battery is used, it may explode.
Replace the battery only with the specified battery
HOW TO REPLACE
Battery for Memory
Battery for Absolute
Replace the Battery
for Memory Back Up