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to maintain a charge on the battery.
Sensors in the battery charger detect battery or battery
charger overtemperature, short or open circuits or cell
imbalance.If any of these conditions occur, the battery
charger will stop functioning and activates the BATT SYS
MAL caution capsule on the master caution panel.
External DC power is supplied to the DC buses of the
helicopter by connecting the external DC power source
to the DC external power receptacle (fig. 2-11-1).Application
of external power operates the DC external power
relay which connects the power source to No. 1 DC
bus.No. 2 bus is energized when the bus tie relay operates.
If the polarity of the external power is reversed, a
blocking diode in the circuit prevents the external power
relay from closing.
TM 1-1520-240-10
2-11-3/(2-11-4 blank)
2-11-7. BATT Switch.
NOTE
The following information applies only if the
battery is the only source of power.
The BATT (battery) switch is located on the ELEC panel
of the overhead switch panel (fig. 2-11-2).The two-position
switch is labeled ON and OFF.When the switch is
ON, the essential, switched battery, and hot battery
buses are energized.Regardless of the battery switch
position, the switched battery and hot battery buses are
powered directly by the battery.To prevent extensive discharging
of the battery while making extended ground
checks of equipment, use an external electrical power
source or operate the APU generator.
2-11-8. RECT OFF Cautions.
Two RECT caution capsules labeled 712 NO. 1 RECT
OFF and NO. 2 RECT OFF, 714A RECT 1 and RECT
2 are on the master caution/advisory panel ( 712 fig.
2-14-5, 714A fig. 2-14-6).These caution capsules are
controlled by the reverse-current cutouts.Whenever one
of the RECTS fail, either through a fault in the RECT or
a bus fault, the respective caution illuminates.Power to
operate the transformer rectifier caution capsules is supplied
by the DC essential bus through the LIGHTING
CAUTION PNL circuit breaker on the No. 1 PDP.
2-11-9. BATT SYS MAL Caution.
A battery system malfunction caution capsule labeled
BATT SYS MAL is on the master caution panel (fig.
2-14-5 and 2-14-6).this caution illuminates when the battery
charger has stopped charging the battery.This can
be caused by an overheated battery or battery charger,
battery cell imbalance, or an output short or open circuit.
Power to operate the capsule is supplied by the DC
essential bus through the LIGHTING CAUTION PNL circuit
breaker on the No. 1 PDP.

TM 1-1520-240-10
2-12-1
SECTION XII. AUXILIARY POWER UNIT
2-12-1. General.
The gas turbine auxiliary power unit T62-T-2B (APU) (fig.
2-12-2) is mounted in the aft cabin above the ramp. The
basic components of the APU are the gas turbine engine,
hydraulic motor-pump, fuel control, accessory drive, and
AC generator. An APU Electronic Sequencing Unit
(ESU) which monitors APU operation is on the left side
of the cabin above the ramp. the ESU is also labeled APU
CONTROL BOX.
The motor-pump on the APU pressurizes the utility and
hydraulic system for main engine starting and ground
checks. The APU also drives an AC generator which
supplies power to the No. 1 and No. 2 electrical systems.
Refer to Section VI for further information on the hydraulic
systems. The APU oil supply is intergal and contained
within the sump of the accessory drive assembly. The
APU receives fuel from the left main fuel tank through a
booster pump, a manual fuel shutoff valve, and a solenoid
valve.
2-12-2. Electronic Sequencing Unit.
The ESU is mounted on the left side of the cabin above
the ramp. The unit monitors APU starting and operation.
in addition, it monitors APU speed and exhaust gas temperature.
the unit continuously compares these parameters
with limits programmed into ESU circuits. If a limit is
exceeded, the ESU will automatically shut down the
APU.
NOTE
The BITE indicators indicate engine condition
only. They will not indicate a defective hydraulic
motor-pump or generator.
Four magnetic built-in-test-equipment (BITE) indicators
are on the ESU. These indicators are either black or
white. A label on the ESU explains the various BITE
indications and their meaning.
2-12-3. APU Switch.
The APU switch is on the ELEC panel of the overhead
switch panel (fig. 2-11-2). It is a three-position switch
labeled OFF, RUN, and START. The switch is spring
loaded from START to RUN. Normally, power to operate
the APU is supplied by the DC essential bus through the
APU CONT NORM circuit breaker on the No. 1 PDP.
　
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