C&D Technologies 41-6965 Condensed - Manual (Page 3)

V. INSTALLATION INSTRUCTIONS
Typically individual batteries are connected
in series to form a higher voltage string of batteries
(e.g. 4 each 12 volt batteries connected in series
for a 48 volt battery system).
Two or more strings may then be connected
in parallel to increase the total capacity of the
system (e.g. two strings of 48 volt 75 ampere hour
batteries connected in parallel for 48 volts at 150
ampere hours capacity).
Refer to figure 1, 2 and 3 for series and parallel
connected batteries.
1. Series Connection of Individual Batteries
Place the individual batteries on the rack or
shelf with 1/2 inch spacing between the
individual units. If installing the units side to
side, all the batteries should be placed with
terminals of the same polarity (POS. or NEG.)
the front of the rack or shelf. If installing
end to end the NEG. (-) terminal of battery
1 should be installed adjacent to the POS.
(+) terminal of battery 2. Refer to figure 2.
The battery terminals and contact surfaces of
the inter unit connecting cable lugs or bus bars
should be cleaned with a brass bristle brush and
lightly coated with protective No Ox ld or NCP 2
terminal grease.
Assemble the inter unit connections torquing the
bolted connections to the values noted in table 1.
Starting at the battery which is to be the positive
output, label it as number 1 and then label the
following batteries in ascending numerical
order.
Measure the open circuit voltage of the series
connected string of batteries. It should be
approximately equal to the number of units times
the per unit voltage. If this is not the case
determine the cause and correct before
proceeding (e.g. reversed polarity unit).
Select the appropriate size cable per the NEC
code to handle the battery charge and
discharge current. A fuse or circuit breaker
should be used in the battery output circuit.
With the circuit breaker or fuse open, connect
the battery to the charger/load circuit.
2. Parallel Connection of Individual Strings of Batteries
When separate strings of batteries are to be
connected in parallel their open circuit
voltage's should be within 1 VDC of each other
prior to making the connections.
Each of the individual battery strings should
be cabled separately to a common, junction
point or box. They should not be "daisy
chained" in parallel. Each string should also
contain a separate fuse or disconnect switch
to facilitate maintenance.
Refer to figure 3 for typical parallel
connections.
The parallel connections should be completed only
when the charger and load are not connected to the
battery output circuit.
VI. FRESHING CHARGE
Once installed the battery system should receive a 24
hour freshing charge at 2.4 volts per cell average (14.4
volts/unit and 7.2 volts/unit average for 12 and 6 volt
units respectively).
VII. FLOAT CHARGING
Following the freshing charge the battery system
should be placed in operation at a float voltage of
between 2.25 and 2.30 volts/cell average (approximately
6.8 and 13.7 volts/unit average for 6 and 12 volt units
respectively).
VIll. PERIODIC MAINTENANCE
These VRLA batteries are maintenance free with
respect to the electrolyte. However the charging
voltage, temperature, performance and connection
resistances must be periodically monitored and any
necessary corrective actions taken to assure reliable
standby power when required.
41-6965/0512/CD 3 www.cdtechno.com