TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
holder. Remove jumpers on relay K1. Replace wires from T2 and Q1 on terminal a and TB1. Replace fuse
F3.
e.
Dummy Load Test for Battery Charger.
(1)
Connect input of battery charger to 120V AC and output to two capacitors (1 and 2) and one resistor (3) in
parallel (see figure 4-3).
(2)
Connect an ammeter as shown. Ammeter reading must be 24 amps.
(3)
Connect a second resistor (4) in parallel.
(4)
Connect ammeter as shown. Ammeter reading must be 24 amps.
(5)
If battery charger does not provide correct amperage, it is defective and must be repaired or replaced.
4-10. REPAIR. Repair of the battery charger involves the replacement of parts and the soldering of wire leads.
a.
Adjustment of Variable Resistors. (See figure 4-3.) In the event that R1, R2, or R4 variable resistors are found to
be defective, and are replaced, readjust resistors in accordance with the following procedure:
(1)
Variable resistor R2 (9, figure 4-4).
(a)
Connect 120V AC to INPUT terminals of battery charger.
(b)
Connect a fully discharged 24V DC battery to OUTPUT POS and NEG terminals in battery charger.
(c)
Remove fuse F3. Connect an ammeter (0 to 50 amps) across fuse F3 fuseholder terminals.
(d)
Adjust R2 so that the battery charger current does not exceed 24 amps.
(2)
Variable resistor R4 (17, figure 4-4).
(a)
Connect 120V AC to INPUT terminals of battery charger.
(b)
Connect OUTPUT POS and NEG terminals of battery charger to 24V DC battery.
(c)
Adjust R4 so that the battery charger output does not exceed 2.33 volts per cell.
(3)
Variable resistor R1 (74, figure 4-4).
(a)
Connect 120V AC to INPUT terminals of battery charger.
(b)
Connect OUTPUT POS and NEG terminals of battery charger to 24V DC battery.
(c)
Adjust R1 so that the battery charger total output voltage (28 volts) does not vary more than 5 percent under
"no load" to "full" condition.
b.
Disassembly. Disassemble the battery charger as follows (see figure 4-4):
NOTE
All components, except resistors (9 and 17), are mounted on plate at rear of battery charger.
(1)
Resistors (9) and (17) are removed by unsoldering and tagging leads, and removing nut (3), washers (4 and 7) and
stud (8) from brackets (5 and 6).
(2)
Fuse clips (32 and 35) are mounted on a board attached to transformer (41).
(3)
Control circuit components are mounted on a separate board attached to the mounting plate (78).
(4)
Relay (54) and capacitor
4-6
