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when the tension bolt is not in place. The ring also has an
alignment mark which you use during IDG installation.
The tension bolt holds the ring in place on the engine adapter
plate. The tension bolt goes through a boss on the ring and fits
into a boss on the engine adapter plate.
Functional Description
The QAD ring holds the IDG to the engine adapter plate. The
ring has clamp track areas that push against the IDG lugs. The
tension bolt keeps the ring in place.
You loosen the tension bolt and turn the ring counter-clockwise
(looking aft) to remove the IDG. This aligns the open portions of
the ring with the IDG lugs.
Training Information Point
The alignment marks on the ring and the engine adapter plate
help you position the ring to the open position for IDG
installation.
CAUTION: DO NOT LET THE IDG HANG ON THE INPUT SHAFT
DURING INSTALLATION. FAILURE TO SUPPORT
THE IDG CORRECTLY OR BUMPING THE SHAFT
CAN DAMAGE THE INPUT SEAL.
GENERATOR DRIVE - QUICK ATTACH/DETACH (QAD) ADAPTER
EFFECTIVITY
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GENERATOR DRIVE - QUICK ATTACH/DETACH (QAD) ADAPTER
GENERATOR DRIVE - QUICK ATTACH/DETACH (QAD) ADAPTER
EFFECTIVITY
GUN ALL 24-10-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The IDG air/oil cooler decreases the temperature of the IDG oil.
This prevents possible damage to internal components of the
IDG.
Location
The air/oil cooler is in the aft lower inside section of the engine
fan case at the 6:30 position. You open the left fan cowl and the
left thrust reverser half to get access to the air/oil cooler.
General Description
The IDG air/oil cooler uses engine fan air to decrease the
temperature of the IDG oil.
GENERATOR DRIVE - AIR/OIL COOLER
EFFECTIVITY
GUN ALL 24-10-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-10-00-030
GENERATOR DRIVE - AIR/OIL COOLER
GENERATOR DRIVE - AIR/OIL COOLER
EFFECTIVITY
GUN ALL 24-10-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-10-00-030
IDG Functional Description
The IDG is an assembly that has a hydromechanical constant
speed drive (CSD) section and an oil-cooled brushless AC
generator. The IDG also includes a permanent magnet
generator (PMG) for control and excitation power. Lubrication
and cooling of the CSD and generator components are by the
same oil circuit. The CSD section turns the generator at a
constant speed of 24,000 RPM. The generator supplies 115/200v
ac, 400 Hz power and has a rating of 90 KVA.
The AC generator is a three-phase brushless machine. The
generator has an AC exciter generator, and a main generator.
The permanent magnet generator (PMG) is a permanent
magnet rotor and PMG stator. The PMG rotor induces an AC
voltage in the PMG stator as the generator turns. The PMG
voltage goes to the generator control unit (GCU). The GCU
rectifies the PMG AC voltage to DC.
See the AC generation system section for more information on
the generator.
IDG Output Power Control
The GCU monitors IDG output power quality at these three
places:
* Neutral current transformer (NCT) at the IDG, between the
generator and ground
* Differential protection current transformer (DPCT) between
the generator and generator control breaker (GCB)
* At the feeder lines, just before the GCB.
The GCU uses the DC voltage to excite the IDG generator
through the exciter windings. The GCU controls the excitation
power to control the output power of the generator. The GCU
controls the generator control breaker (GCB) as a function of
power quality.
Manual IDG Disconnect
You use the generator drive disconnect switch to do a manual
disconnect of the IDG. When you put the switch to the
disconnect position, power goes to a solenoid on the IDG if
the engine start lever is in the idle position. The solenoid
energizes and disconnects the CSD from the input drive shaft.
You reset the manual disconnect at the IDG. The engine must
not be turning when you do the reset.
　
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