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The display test during BITE takes up to 15 seconds.
Temporarily push the maintenance switch again (just after the
display tests begins) to bypass the display test. The display will
go directly to the first message or the NO FAULTS STORED
message.
ELECTRICAL POWER - TRAINING INFORMATION POINT - 2
EFFECTIVITY
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Purpose
The generator drive makes three-phase, 115/200v ac, 400 Hz
power for use by the electrical power system.
General
The generator drive has these components:
* Integrated drive generator (IDG)
* Air/oil cooler
* Quick attach/detach (QAD) adapter.
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Purpose
The generator drives are the normal source of AC power in
flight. There are two IDGs on the airplane. Each supplies 115/
200v ac, 400 Hz power. Each IDG can supply up to 90 KVA.
General Description
The engine accessory gearbox turns the IDG. Because engine
speed changes, the gearbox speed also changes. The IDG
takes the variable input speed and changes it into a constant
speed of 24,000 RPM for its internal AC generator. The IDG uses
a combination of internal mechanical and hydraulic
components to supply the constant speed to the generator.
The IDG uses oil for these purposes:
* Hydromechanical (constant speed drive)
* Lubrication
* Cooling.
The IDG has an oil cooling system. The cooling system has
these external cooling components:
* Air/oil cooler
* IDG oil cooler.
The generator drive and standby power module gives indication
and control of the AC generator drive system.
You use the generator drive switch to manually operate the
disconnect mechanism of the IDG. The IDG stops turning after
the disconnect. You can reconnect the IDG on the ground only
while the engine is not running. The IDG also has an automatic
thermal disconnect which occurs when the oil temperature gets
too hot. You must remove the IDG to reset this type of
disconnect.
NOTE: The IDG vendor recommends that you do not reconnect
an IDG that has been disconnected for any reason
other than a functional test or an unintentional
disconnect. Operation of IDGs that have had oil
pressure problems (causes DRIVE light) may cause
further damage to the IDG.
IDG
The IDG is an assembly that has a hydromechanical constant
speed drive (CSD) section and an oil-cooled brushless AC
generator section. The IDG also includes a permanent magnet
generator (PMG) for control and excitation power to the main
generator section.
The generator control unit (GCU) rectifies the PMG AC output to
DC. See the AC Generation section for more information on the
　
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