TM5-6130-301-13&P
f. Press through the plastic cover and set the circuit breaker switch for the selected 24 volts station to the ON
position.
g. Position controlled charging station selector to station selected.
h. If the circuit breaker switch holds, turn the rheostat clockwise until the ammeter indicates approximately
7.5 Amperes, and record the time. If the circuit breaker switch does not hold, check connections. If connections
are correct, return battery to direct support maintenance.
NOTE
Soft boiling is indicated by small bubbles rising to the surface of the
electrolyte allowing the surface to remain mostly smooth.
.
i. When soft boiling is noted in the battery (2 to 4 minutes), turn the rheostat counterclockwise for a current
indication on the ammeter of approximately 5 Amperes, and again record the time.
j. When soft boiling is again observed (usually 5 to 10 minutes), turn the rheostat counterclockwise for a
current indication on the ammeter of approximately 2.5 Amperes, and again record the time.
NOTE
If soft boiling is noted within a time frame of less than 5 minutes,
shift to the uncontrolled station sooner.
k. After 5 to 10 minutes at this charge rate, turn off the station circuit breaker switch and shift the charge
cable connector to any unused, uncontrolled 24 volt charging station for completion of charging.
Hard boiling indicates that a battery is charging at a rate faster than
the safe charging current, causing overheating to the point where
plates warp, and the battery is rendered unserviceable. Hard boiling
is indicated by big bubbles rapidly rising to the surface of the
electrolyte, causing violent agitation of the liquid.
1. When the circuit breaker switch for the uncontrolled station is set to on and remains in the ON position, and
hard boiling does not occur, the battery is taking a normal charge.
NOTE
If the battery starts to hard boil again, reconnect the battery to the
controlled station and continue charging under controlled conditions.
m. Note the time and continue to monitor the battery condition every 10 to 15 minutes until the battery is
fully charged.
2-8. BATTERY CHARGING OPERATION (Lead-acid, 12-volts dc).
a. Select one of the two available controlled 12 VOLTS stations (STA 1-12 VOLTS) (18, Figure 2-1) or
(STA 4-12 VOLTS) (11).
b. Check and make sure the circuit breaker switch for the selected 12 VOLTS station is in the OFF position
and the current control for selected 12 VOLTS station (INCREASE STA 1) (2) or (INCREASE STA 4) (7) is
turned fully counterclockwise.
2-8
