BFGoodrich PS-823 - Battery Pack and Cell Test Procedure; Charging Circuit Assembly Inspection; Battery Pack Deep-Cycle Discharge and Testing

BFGoodrich Avionics Systems, Inc.
Component
Maintenance Manual
P/N
101-1075-()
C.
Battery Pack and
Cell Test
Procedure
Remove Cover
Assembly
(Figure IPL
1-5,
Illustrated Parts
Listing section)
from
PS-823
and
inspect the
Battery
Pack
and Battery Access
Cover (Figure
601-2,
Repair
section)
for
indications
of
venting or corrosion.
Remove
Battery Pack from the
unit,
remove
Battery Access Coverfrom
the
Battery
Pack,
and
inspect individual
cells and adjoining areas for evidence of
venting,
ruptures or corrosion.
Replace
any
defective
cells.
NOTE:
Battery cells
can normally
be
inspected without
physically
removing individual
cells
from the battery pack.
.
1) Charging Circuit Assembly
Inspection
Poor
Battery
Pack health is the result of cell deterioration or inadequate charging.
When
discharge tests reveal
poor Battery
Pack
health,
take time to inspect
for
evidence
related to
the
charging circuitry that may
be the cause
of
inadequate charging.
After
Battery
Pack is
removed, check:
a.
For
frayed,
discolored and burnt
wires
and
connections.
b. Insulation
condition on all charging circuit
wires.
c.
Solder terminals on the Battery Pack(s)
d. Evidence
of
overheating of
charging circuit components (A1R34,
AlR39).
2)
Battery Pack
Deep-Cycle
Discharge and
Testing
CAUTION FAILURE
TOSHORTACELLASITDROPS
BELOW
0.5VDC
ON
ADEEP
CYCLE
DISCHARGEWILL
CAUSE
THE
CELLTO
BECOMEREVERSED
AND
DAMAGETOTHE
CELLMAYRESULT.
Apply
a
7 Ohm ±1%
150-Watt
load resistor across the Battery Pack terminals. This
will
initiate the
discharge process. Monitor the
individual
cell voltages
with
a DC
voltage
meter. When an individual cell reaches 0.5Vdc or
less,
short out the
remaining
stored
energy by
crossing
a 16 AWG buswire
between
the + and
-
cell terminals.
Continue
this
action until all cells are
shorted-out
and
leave
the pack in this condition
for
24 hours.
After a
24-hout
duration,
remove
the shorting
wires from individual cells and the load
resistor
form the Battery
Pack.
msmijtp202TestFaultIsodiskl59
24-20-03
Page 110
Revision
A
June 30,
1999