BFGoodrich
Avionics
Systems,
Inc.
Component Maintenance
Manual
P/N 101-1075-()
c. At
the end
of
charge
(within
one
hour)
connect the cell to
a 0.35
Ohm
(5-10
Watt)
resistor for
discharge
testing.
Discharge
the
cell to
a
level
of 1.0Vde
(no
lower). The
elapsed
time
from
moment
of
discharge
initiation to the 1.0Vde
level shall
be 26
minutes or greater. Shorter
times are not indicative
of
an unusable cel(
but
it
will
not
meet
the
standard for
capacity that
BFGAS,
Inc. has
set as
a
minimum.
If
the cell
fails
the
discharge
time
test,
it
must be
deep
cycle
discharged
to erase the
NI-CAD
"memory"
phenomenon
(memory appears
as an apparent
loss
of capacity).
Erasing memory is
accomplished
by "flexing"
the
NI-CAD
cell
from
no
charge
to full
charge.
d. Deep
cycle
discharge:
(1) Continue discharging
the
cell
with 0.35
Ohm
resistor.
(2)
Monitor the cell voltage during discharge. When
the
cell reaches
+0.5Vde,
connect a
16 AWG
buswire
jumperacross the
positive
and negative
terminals,
shorting
the
cell
out. Leave
the
cell in
this
condition for approximately
24 hours
before
performing
the next step.
(3)
Remove
shorting jumperand
recharge cell
as in Step b.
Repeat
Step c.
(4)
After the third
deep
cycle procedure (if
needed)
and if the cell discharge doesnot
meet the requirements of
Step c,
recharge the cell as in
Step
band perform
Step
e.
e. Reconnect the
0.35 Ohm
load
resistor
and
DC
voltmeter,
and perform cell
discharge
check.
If discharge time is
too
fast,
replace
the
cell.
6.
PS-823
Storage
A.
If
a "ready" condition is required for the
PS-823,
it
is
recommended
that the power supply be
charged
according
to
Battery Pack Charging
Procedures (in unit), Paragraph
5-B,
for eight
hours after
every 15 days
of
storage.
Do not trickle charge!
B. For
ready
and non-ready
storage
requirements,
perform
Initial Battery Test Procedure,
Paragraph
5-A
and
Battery Pack Charging
Procedures (in
unit),
Paragraph
5-B
every
three
months
NOTE: BFGAS recommends that
Battery
Pack
Deep-Cycle
Discharge
and
Testing,
Paragraph
C-1,
be
performed
with two
deep-cycle
discharges at
least once per
year to a
PS-823
that is
in
long
term storage.
This will equalize
uneven
cells and
aid in preventing "memory"
buildup.
7.
PS-823A
Through H
Periodic Inspection
And
Charging
Inspect
PS-823A
through
H
(excluding
AIT
through H/T)
batteries by
performing
the
following:
A.
Connect
the
UUT to test
equipment as
shown in Figure l
13, except disconnect
the indicator.
B. Position
the test equipment
switches
as
follows:
msmijtp202TestFaultlsodiskl59
24-20-03
Page
112
Revision
A
June
30,
1999
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