9.
MAINTENANCE
/MELSEC=A
.--
9.2
Battery
Change
9.2.1
Battery
chmge
frequency
When
the
data backup battery
voltage
drops, the LED on the AD71
front panel
is
lit
and an input signal (battery error) to the
PC
CPU
is
enabled. The battery
is
live
for
about one month more and, if
it
is
not replaced, data
will
then
be
lost
or
corrupted.
Guide
for
preventive maintenance
1)
The battery should be replaced every 4 to
5
years if
it
is
only
used for memory back up
for
a
maximum
of
300
days in that
period.
2)
Battery changing frequency
for
memory backup duty exceeding
300
days can
be
calculated
as
follows.
Assume that there
are
five
operation days (IO-hour operation
and 14-hour power-off during
a
day) and
two
power-off days
in
a
week. Under these conditions, power-off period during
one
week
is:
14 (hours)
x
5
(days)
=
70 hours
24 (hours) x 2 (days)
=
48 hours
7200 (hours)
/
(70+48) (hours)
=
61
(weeks)
61 (weeks)
x
7
(days)
=
427 (days)
Regarding one month
as
30
days,
427 (days)
/
30
(days)
=
14.2 months
Hence,
I
it
is
necessary to change the battery every 14 months.
i
I
L
9-2
IB
INN
€6101-A
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