Symptom
DC VOLTAGE
CHECKS
(CONTINUED)
DC voltage measured
between either of the
battery system output
terminals and ground
(rack) or a ground
fault indicated by
automatic monitoring
equipment.
Damaged battery
container allowing
electrolyte to
wick out to
the grounded
surface (rack).
Personnel shock hazard
which could result in
serious injury or
electrocution.
Potential burning of the
container at damaged
area or battery fire.
Determine the source
of the ground fault and
replace battery.
Possible Causes
Possible Result
Corrective Actions
AC RIPPLE
VOLTAGE
CHECKS
AC ripple (p-p)
voltage on
the system is
greater than
4% of the value
of the DC
float voltage.
Poor filtering of the
charger output.
Excessive AC ripple
could cause the battery
to cycle at the ripple
frequency and result in
heating and deterioration
of the plate
active material.
Improve the charger
output filtering.
Individual battery
in string
exhibits AC
ripple voltage
of twice that of
the other
typical batteries
in string.
Battery with the
high AC ripple
voltage has a
proportionately
higher impedance
and should be
further evaluated
for performance.
Subject battery
could have a
deteriorating
conductive
path or a dry,
shorted or
open cell.
Reduced
operating time.
Potential conditions
could be conducive to
thermal runaway.
Verify the battery
condition and replace
as required.
TABLE 1-VRLA Battery Symptoms and Solutions (Continued)
41-7546/0213/CD 16 www.cdtechno.com