Battery Charger Float Voltage Adjustment - SAC SS-800AVS Manual

of the two lower taps on the center coil. This is accomplished by
lowering the antenna and then removing the protective cover from
the center section of the antenna. The tap, which allows use of
the full coil, sets the resonant frequency at approximately 500
KHz, while the tap allowing use of about one-half of the coil sets
the resonant frequency at approximately 900 KHz.
6.2.4 Battery Charger Float Voltage Adjustment
The following procedure is based on a lead calcium storage battery
system with 52.4 volts (2.18 volts/cell) chosen as compromise between
charging time and battery water use. The following float voltages
are recommended by various battery manufacturers. For other bat-
teries consult manufacturers.
Lead Antimony (24 cells)
2.15 to 2.17 volts/cell
(51.6 to 52.1) volts
Lead Calcium (24 cells) 2.17 to 2.25 volts/cell
(52.1 to 54.0) volts
Nickel Cadmium (38 cells) 1.40 volts/cell
(53.2 volts)
As required, adjustment may be made to these values instead
of 52.4 volts.
Disconnect AC power from the transmitter. Turn off the switch
on the battery standby unit and disconnect one terminal wire
from the battery bank.
Loosen the four retaining screws and remove the battery charger
assembly from its enclosure.
Position the battery standby unit so that nothing can Short
to the internal components or wiring of the battery standby
unit.
Reattach the wire to the battery bank, apply AC power and turn
on the switch on the Battery Standby Unit.
Measure the battery terminal votage. If the Float Mode LED
on the Charger Control PWB is not lit, allow the batteries to
charge fully. The battery voltage should rise to approximately
55 volts. The LED should then light, and the voltage should
then fall slowly to approximately 52.4 volts.
SS-800AVS Southern Avionics
Company
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