Lucent Technologies Enhanced VR Series Batteries
Issue 5 December 1998
Installation 6 - 7
Table 6-A: Initial Charging
Battery Condition
Action
All batteries have similar date codes
and storage histories and none are
more than 6* months old or they
have been maintained according to
the “Battery Storage” section of this
product manual.
Make voltage and polarity checks as described
later in this section and connect string(s) to plant.
Charge at the recommended float voltage from
48 hours before switching into service.
The batteries have dissimilar date
codes (more than one month apart)
and they are within the required
recharge period (charge-by date).
Preferably the initial charging should be
conducted at a warehouse with good ventilation.
Using an external charger**, charge string at
2.35 volts per 2-volt battery or 4.70 volts per
4-volt battery until all modules have voltages
within ±0.05 volts of 2.35 volts (for 2-volt
battery) or within ±0.10 volts of 4.70 volts (for
4-volt battery). Do not charge for more than 48
hours at 2.35 volts. Reduce the charge voltage to
the recommended float voltage from Table 7-A
for an additional 24 hours before putting into
service. Install batteries and make voltage and
polarity checks as described in the following
section, and connect string(s) to plant.
If the strings have already been installed at the
site, follow the above procedure and use the
rectifier as the charger. Ensure good ventilation
at the site. Reduce the charging time at 2.35 volts
to no more than 24 hours.
The batteries are older than 6*
months or have not been maintained
according to the “Battery Storage”
section of this product manual.
Do not install. Replace batteries.
*If storage temperature exceeds 90° F (32° C), then open circuit time should not exceed
4 months.
**The charger must have overcurrent protection in its output, must be able to remain
across the modules in case of an ac power failure, and should not have crowbar
protection. (Crowbar protection is an option used on some commercial portable power
supplies that clamps a short across the output leads of the rectifier when the rectifier
senses a higher voltage at the load than it is generating. This feature should not be used
with batteries).
