Xsilogy Inc. 0920HP Benutzerhandbuch
Appendix A – Battery Diagnostics
Battery Type
Symptom
Problem
Possible Cause
Impact
Recommended Action
How BattGuard Helps
Flooded, VRLA
Resistance readings >20%
above installation value or value
set by manufacturer.
above installation value or value
set by manufacturer.
Excessive resistance
compared to installation
value or average for string.
compared to installation
value or average for string.
Loose connection.
Corrosion.
Corrosion.
Degradation in performance.
Retorque and retest. If terminal corrosion,
clean and check resistance of connection.
clean and check resistance of connection.
Calculated impedance for battery
will be >20% greater than
average for string.
will be >20% greater than
average for string.
Flooded, VRLA
Water below low-level line.
Specific gravity increases.
Electrolyte is normally 1.215, and
water is 1.0.
Specific gravity increases.
Electrolyte is normally 1.215, and
water is 1.0.
Low electrolyte level.
Normal electrolysis in
flooded batteries.
Leaks.
flooded batteries.
Leaks.
Reduced battery capacity.
Add water per manufacturer
recommendations. Give equalizing charge
to help mix water with electrolyte. Water
has lower specific gravity and will sit on
top. May take 6-8 weeks for complete
mixing to occur in some cells.
recommendations. Give equalizing charge
to help mix water with electrolyte. Water
has lower specific gravity and will sit on
top. May take 6-8 weeks for complete
mixing to occur in some cells.
Low electrolyte will result in an
increased calculated impedance
reading.
increased calculated impedance
reading.
Flooded, VRLA
Cell temperatures deviate more
than 3°C (5°F).
than 3°C (5°F).
Differing response to
charge on same string.
charge on same string.
Inadequate airflow in
room or enclosure.
Proximity of some
batteries to heat or
cold source.
room or enclosure.
Proximity of some
batteries to heat or
cold source.
Some batteries overcharge, some
undercharge leading to reduced
capacity.
undercharge leading to reduced
capacity.
Adjust temperature environment of
batteries or contact battery manufacturer to
determine how best to compensate.
batteries or contact battery manufacturer to
determine how best to compensate.
Differences in ambient
temperature for each battery on
the string will be apparent.
temperature for each battery on
the string will be apparent.
Flooded, VRLA
Excessive temperature. Thermal
runaway.
runaway.
High float voltage -
overcharging
overcharging
Incorrect charger
settings. Defective
charger / UPS.
settings. Defective
charger / UPS.
Loss of water in flooded cells and
dryout in VRLA cells. Accelerated
corrosion and shedding of active
material from positive plates
dryout in VRLA cells. Accelerated
corrosion and shedding of active
material from positive plates
Check charger/UPS settings. Service
charger/UPS.
charger/UPS.
Battery ambient and shunt
temperatures will be significantly
higher than average for string.
Steady state float voltage and
current will be higher than
normal.
temperatures will be significantly
higher than average for string.
Steady state float voltage and
current will be higher than
normal.
Flooded, VRLA
Loss of active material from
negative plates. Sulfate crystals
hardening on plate surfaces.
negative plates. Sulfate crystals
hardening on plate surfaces.
Loss of active material
from negative plates.
Sulfate crystals hardening
on plate surfaces.
from negative plates.
Sulfate crystals hardening
on plate surfaces.
Incorrect charger
settings. Defective
charger / UPS.
settings. Defective
charger / UPS.
Permanent loss of battery capacity
Check charger/UPS settings. Service
charger/UPS.
charger/UPS.
Steady state float voltage and
current will be lower than normal
current will be lower than normal
Flooded, VRLA
Higher float voltage needed to
maintain charge. If charger is not
adjusted to provide higher float
voltage, cells may be
undercharged leading to
problems described under low
float voltage.
maintain charge. If charger is not
adjusted to provide higher float
voltage, cells may be
undercharged leading to
problems described under low
float voltage.
Loss of active material
from negative plates.
Sulfate crystals hardening
on plate surfaces.
from negative plates.
Sulfate crystals hardening
on plate surfaces.
Poor or non-existent
ambient temperature
control.
ambient temperature
control.
Loss of capacity.
Install battery enclosure with regulated
heat source. If temperature cannot be
increased, consult battery manufacturer for
appropriate charge level at the ambient
temperature.
heat source. If temperature cannot be
increased, consult battery manufacturer for
appropriate charge level at the ambient
temperature.
Ambient temperature reading will
be <77°F.
be <77°F.
Flooded, VRLA
High temperature causes
increased float current.
Increased corrosion. Gassing.
increased float current.
Increased corrosion. Gassing.
High temperature at
batteries.
batteries.
Poor or non-existent
ambient temperature
control.
ambient temperature
control.
Loss of battery life. Gassing, which
means loss of water in flooded cells
and dryout and thermal runaway in
VRLA cells. Tests demonstrate that
battery life is approximately 50% for
each 10°F increase in ambient
temperature above 77°F.
means loss of water in flooded cells
and dryout and thermal runaway in
VRLA cells. Tests demonstrate that
battery life is approximately 50% for
each 10°F increase in ambient
temperature above 77°F.
Install battery enclosure with regulated
cooling source. If temperature cannot be
reduced, consult battery manufacturer for
appropriate charge level at the ambient
temperature.
cooling source. If temperature cannot be
reduced, consult battery manufacturer for
appropriate charge level at the ambient
temperature.
Ambient temperature reading will
be <77°F.
be <77°F.
Flooded
Temperature increase.
Thermal runaway.
Excessive temperature
at batteries. Excessive
float voltage.
at batteries. Excessive
float voltage.
Melting of jar. Possible fire or
explosion in extreme cases.
explosion in extreme cases.
Take steps to ensure that batteries are
maintained at 77°F. Consult battery
manufacturer to determine appropriate
charge voltage for battery at its ambient
temperature.
maintained at 77°F. Consult battery
manufacturer to determine appropriate
charge voltage for battery at its ambient
temperature.
Ambient and shunt temperature
readings will be significantly
higher than normal or than string
average.
readings will be significantly
higher than normal or than string
average.
Preliminary Release X1
6-3