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FEATURES
The Onan SCR battery float charger is a fully automatic,
constant voltage current limiting charger with a built-in
equalize charge timer. When the charger is used for
stationary service, the permanently connected battery
floats at a constant voltage. As the battery approaches
the pre-set full charge voltage, charging current auto¬
matically tapers to zero. This feature keeps batteries
fully charged with no gassing and no overcharging.
For faster charging in portable service or to equalize
charge the floating battery, a higher charging voltage
can be obtained by switching on the equalize charge
timer. Turning the timer raises the charger output volt¬
age for the selected time interval (0 to 12 hours). At the
end of the charging period, the timer automatically
switches back to the float voltage.
LINE CONNECTION
USE: NO. 16AWG
BATTERY CONNECTION
USE. NO. 16 AWG OR LARGER
FIGURE 1.
BATTERY CHARGER TERMINAL BLOCK
FOR LINE AND BATTERY CONNECTIONS
Another feature includes special circuitry to protect the
charger from possible damages due to shorted output
leads, reversed battery connections, and overload cur¬
rents. The SCR battery charger may be used for both
lead-acid and nickel-cadmium batteries.
INSTALLATION
The metal charger cabinet can be mounted on the wall
using the four mounting brackets (one on each corner of
the cabinet) or set on a bench using the four rubber feet
Install the battery charger in a location where it is pro¬
tected from moisture, dust, dirt, or high ambient temper¬
ature conditions (140°F/60°C and above).
Use 16 AWG wire for the line connections and 16
AWG or larger for the battery connections. Route
the lead wires through the knockout hole in the
bottom of the chassis.
4. The battery charger is wired at the factory for 120
volt AC (input) operation. To operate at 208 or 240
volts AC (input), change the lead wire connections
to the power transformer (T1) as shown in Figure 2.
The exception is 480 volt chargers that have single voltage input
suitable for inputs in the range of 440 to 480 volts AC.
Wiring
1. Remove the ground cable of any battery that will
connect to the battery charger.
2. Remove the AC power source to which the battery
charger will connect
High AC voltages present an
electrical shock hazard that can
cause severe personal injury or death. Be sure to
remove AC power during the installation pro¬
cedures.
A WARNING ]
TRANSFORMER
3. Install lead wires (not included with charger) for the
AC line voltage connections and charger to battery
connections. Connect lead wires to the terminal
figure 2
.
battery charger power transformers
board on the inside backplate as shown in Figure 1.
Also connect a ground wire to the grounding stud at
the bottom of the charger cabinet
1
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