1. METHOD OF REPLACING BATTERY
METHOD OF REPLACING BATTERY
This chapter describes how to replace the CNC backup battery and
absolute pulse coder battery. This chapter consists of the following
1.1 REPLACING BATTERY FOR LCD–MOUNTED TYPE i
1.2 REPLACING THE BATTERY FOR STAND–ALONE TYPE i
1.3 BATTERY IN THE PANEL i (3 VDC)
1.4 BATTERY FOR SEPARATE ABSOLUTE PULSE CODERS
1.5 BATTERY FOR ABSOLUTE PULSE CODER BUILT INTO
THE MOTOR (6 VDC)
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.
Therefore, the above data is not lost even if the main battery fails. The
backup battery is installed in the control unit prior to being shipped from
the factory. This battery can provide backup for the memory contents for
about a year.
When the battery voltage falls, alarm message “BAT” blinks on the LCD
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 one or two weeks of the alarm first being
issued. This, however, depends on the system configuration.
If the battery voltage subsequently drops further, backup of memory can
no longer be provided. Turning on the power to the control unit in this
state causes system alarm 910 (SRAM parity alarm) to be issued because
the contents of memory are lost. Replace the battery, clear the entire
memory, then reenter the data.
Replace the memory backup battery within a few minutes while the
control unit is brought off.
The following two kinds of batteries can be used.
D Lithium battery, incorporated into the CNC control unit.
D Two alkaline dry cells (size D) in an external battery case.
A lithium battery is installed as standard at the factory.
Battery for memory