The part programs, offset data, and system parameters are stored in the
SRAM on the control unit. The power to the SRAM memory is backed
up by a lithium battery mounted on the front panel of the control unit.
Even when the main power supply is turned off, data is not lost if the
battery is connected normally. The lithium 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 or LCD display. For a combination of the DPL/MDI
and DPL/MDI operation package, ”BAL” is displayed. And the battery
alarm signal BAL <F001#2> is output to the PMC. When a display unit
is not always connected to the machine, this signal causes a battery alarm
to appear on the operator’s panel. When this alarm is displayed, replace
the battery as soon as possible. In general, the battery can be replaced
within one or two weeks, however, this depends on the system
If the battery voltage gets lower, it becomes impossible to back up the
content of the SRAM. Turning on the power to the in this state causes
system alarm 910 (SRAM parity alarm) to occur because the contents of
memory are lost. Clear the entire SRAM memory and reenter data after
replacing the battery. Data should be saved to the flash memory card or
floppy disk beforehand.
When replacing the memory backup battery, do so while the control unit
is turned off.
The following two kinds of batteries can be used.
D Lithium battery built into the Power Mate i control unit.
D Two alkaline dry cells (size D) in the external battery case.
(1)Prepare a new lithium battery (ordering drawing number:
(2)Turn the machine (Power Mate i) on for about 30 seconds.
(3)Turn the machine (Power Mate i) off.
(4)Remove the old battery from the top of the Power Mate i control unit.
First unlatch the battery, remove it from the holder, and detach its
connector. The battery holder is on top of the face plate (or the memory
connector) on the base printed–circuit board.
Battery for Memory
Backup (3 VDC)
Replacing the lithium