TM5-6130-301-13&P
Make sure the charging area is adequately ventilated. The hydrogen
gas driven off during charging can cause an explosive mixture in a
confined area.
Because of the danger of hydrogen gas explosion, a strict ban on
smoking or open flame must be enforced in the charging area. If at all
possible, an explosion-proof generator or power supply is
recommended. If not, try to arrange the generator or power supply
on one side of a wall or barrier through which the input cable passes
to this equipment on the opposite side of the wall or barrier.
d. Setup this equipment in a clear work area with a generator or power supply delivery 28 to 30 volts de
located nearby so that the input power cable will connect this equipment to the power supply. Arrange space for
the batteries to be charged so that the equipment cables will reach from the equipment to the batteries with
space to allow inspection of the batteries or charge. It is also strongly recommended that wood bridges be
constructed to lay over the charging cables so that such cables are not damaged or disconnected as personnel
move about the area, checking and connecting batteries. These bridges need only be high enough to clear the
cables and wide enough to provide a walk path
(1) Be sure the master power switch (2, figure 2) is off, then connect the input power cable between the
generator or power supply and the input connector (1). Consult the manual of the generator or power
supply to determine the maximum continuous dc voltage permitted.
(2) Ground the distribution panel by connecting a heavy wire from the ground stud (8, Figure 2-1) to a
ground rod assembly NSN 5975-00-878-3791. Refer to FM 20-31 for grounding procedures.
(3) Turn the power switch on. Adjust the generator or power supply to deliver 28 volts (or its maximum if
less than 28 volts). Note -if the ambient temperature in the charging area is below freezing (32F),
increase the generator or power supply dc voltage to 30 volts (maximum) provided this does not exceed
its operating limits.
Always be sure that the circuit breaker concerned is in the OFF
position before connecting or disconnecting batteries or cables in the
circuit.
2-6. PREPARATION REQUIREMENTS. When a battery is received for charging, check each cell with a
hydrometer to determine the degree of charge/discharge. After changing, use the hydrometer again as a final
check to make sure the battery is fully charged and ready for return to service. A specific gravity reading of
1.280 on the hydrometer indicates a fully charged battery. Readings below this value indicate the degree of
discharge. A hydrometer reading of 1.20 indicates a battery should be recharged.
a. As batteries are received for charging, they must be thoroughly cleaned, terminal posts must be dressed to
assure a good electrical connection, and each cell must be checked and filled with distilled water as required.
Refer to TM 9-6140-200-14 for battery service.
2-6