
4. POWER SUPPLY UNIT CONNECTION
B–63463EN/01
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System parameters are stored in SRAM memory in 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. The above data is not lost even when
the main power supply is turned off, provided that the battery is connected
correctly. The backup battery is mounted on the control unit at shipping.
This lithium battery can maintain the contents of memory for about a year.
When the voltage of the battery becomes low, alarm is displayed. 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 configuration.
If the voltage of the battery becomes any lower, contents of SRAM
memory can no longer be backed up. Turning on the power to the Digital
Servo Adapter in this state causes system alarm to occur because the
contents of SRAM memory are lost. Clear the entire SRAM memory and
reenter data after replacing the battery.
CAUTION
1 Just in case the battery runs down or an unexpected
accident happens, the latest data in the SRAM memory
must be backed up to a flash memory card or the Handy File.
(The data cannot be backed up using an SRAM memory
card. An SRAM memory card is used to copy the data to the
hard disk of the personal computer.)
2 The battery is secured to the base PC board. If removing
the base PC board with the battery connected to it, back up
the latest data beforehand just in case the data is lost.
3 If the power supply of the Digital Servo Adapter is turned off
with the battery removed, the data cannot be backed up for
30 minutes or longer. If the battery is removed with the
power supply of the Digital Servo Adapter turned off, the
data cannot be backed up.
NOTE
A lithium battery is installed as standard at the factory.
4.7
BATTERY FOR
MEMORY BACKUP
(3 VDC)