it90T400SLN
lIIGROUND
POWER
UNIT
2. OPERATINGPROCEDURES(Continued)
B. Engine Start Procedures:
The following steps
must be
performed
in the
sequence
in
which
they
are
presented
(See
Figure 1):
WARNING
DO NOT
CONNECT LIVE POWER
CABLE TO AIRCRAFT.
SEVERE
ELECTRICAL
ARCING
MAY CAUSE
SERIOUS
INJURY, DEATH AND
OR
DAMAGE
TO
THE
EQUIPMENT.
January
15, 1999
Original
1-2
Page
3
Figure
1. Control
Panel
Gomponent
tdentification
Item
Description
,|
CONTROL
PANEL
ASSEMBLY:
Mounted
at front
of electronic
box assembly
2 AC VOLTMETER:
Shows
generator
(L-N)
output
voltage
(0-150
volts).
3
FAULT INDICATORS
-
GENERATOR:
Fault
indicators willilluminate
red
when a fault
has occuned.
Each
fault removes
voltage fom the
aircraft. Overvolts
& Overload
stops
allvoltaoe
oeneration.
4
AMMETER: Indicates
generator
(L-N)
output
cunent.
5 FUEL
LEVEL GAUGE: Indicates
amount of fuel
remaining
in fuel
tank.
6 OIL PRESSURE
GAUGE: lndicates engine
oil
pressure.
7
FAULT INDICATORS
-
ENGINE
(Red):
lndicates
to operatorthe
protective
system
that
caused
the engine
shutdown, i.e.,
Low
oil
pressure
(10
psi
min.);
Engine Overspeed
(2550
RPM);
Engine
Over
Temperature
(225"F).
8 IGNITION
ON INDICATOR
(Yellow):
Lights
when the
ENGINE CONTROL
PO\ /ER switch is turned on.
I WATER
TEMPERATURE GAUGE:
Indicates engine
watertemperature
(225"F
max.).
10 BATTERY VOLTMETER:
lndicates battery voltage
condition.
Do not
start unit if voltage
is less than: 10V
on
12V
units
and 20V on 24V units.
11 HOURMETER:
Indicates totalengine run
time.
12
START
S\MTCH: Starts engine. Pushbutton,
momentary contact
switch.
13 FAULT
LAMP
TEST
(Pushbutton): \Mren
pressed
while
unit is in
the RUN mode, it lights allfaults lamps.
When
pressed
while the iqnition switch is in the ON
position.
it will
lioht onlv the enqine fault lamps.
14 IGNITION SWTCH
(ON/OFD:
On
position
supplies startino
and controllino voltaqes
to
enoine circuits.
15
PANEL
LIGHTS SWTCH:
Tums
panel
liohts
On for nioht time ooeration.
16 RUN/IDLE SWTCH: Two
position
switch. Controls engine
speed.
IDLE
position
for starting.
RUN
position
for
oenerator ooeration.
17 AMMETER SWTCH
(Rotary):
Measures cunent
of
phases
'1.2
or 3.
18 FREQUENCY METER: Shows
qenerator
output frequencv
(360-440H2).
19
AC
LOAD
CABLE ON
(Push-button):
Supplies
AC
powerto
output
Cable 1
(single
and
dual AC
output units).
Used
in conjunction with INTERLOCI(BY-PASS switch. \Mren
ON is
pushed
with INTERLOCK
setting,
GPU
provides
momentary 28Y DC to aircraft connector
pins
E & F.
AC
LOAD
CABLE
2
ON: Supplies AC
powerto
output Cable
2. Only on units
with dualAC output
(See
figure
4, Sect. 1-1)
20 AC LOAD CABLE OFF
(Pushbutton):
Removes output
powerfrom
cablel
(single
and dualAC
output units).
AC
LOAD
CABLE
2
OFF(Push-button)
Removes output
power
from cable
2.
Only on units with dual AC
out-
put. (See
figure
2,
Sect. 1-l)
21
VOLTMETER S\MTCH: Selects either
Line to Line or Line to Neutralvoltage
measurements
to show on the
voltmeter.
Property of American Airlines
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