IDG AIR/OILHEAT EXCHANGER
SEE E FIREWALLIDG AIR/OIL HEAT EXCHANGER
IDG AIR/OIL HEAT EXCHANGER
E
Generator Drive System - Component Location
Figure 1 (Sheet 6)
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757 MAINTENANCE MANUAL
ACTUATION RAM SEE G
FSEE IDG AIR/OIL HEAT EXCHANGE
LINKAGE ACTUATION
HEAT EXCHANGER IDG AIR/OIL
A9830 F IDG AIR/OIL HEAT EXCHANGER INSTALLATION VANE CRANK LEVER VANE CLOSED RIG PIN POSITION
LINKAGE VANE OPEN RIG PIN POSITION
A9832RAM
ACTUATION RAM INSTALLATION
G
Generator Drive System - Component Location Figure 1 (Sheet 7)
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757
MAINTENANCE MANUAL
SOLENOID VALVE INSTALLATION SEE H INSTALLATION SOLENOID BRACKET NUT WASHER (2 LOCATIONS) (2 LOCATIONS)
VALVE SOLENOID WASHER-D (3 LOCATIONS)
BOLT (3 LOCATIONS)
VALVE TO RAM TUBE SOLENOID
TUBE SOLENOID VALVE AIR TAP
CONNECTOR ELECTRICAL
SOLENOID VALVE INSTALLATION
H
C2389
Generator Drive System - Component Location Figure 1 (Sheet 8)
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757
MAINTENANCE MANUAL
D. Quick Attach/Detach Coupling
____________________________
(1) The quick attach detach (QAD) kit allows rapid installation and removal of the IDG to and from the engine accessory gearbox. The kit includes a QAD ring, and an adapter plate. The ring mates along the outside edge of the adapter plate. The adapter plate is mounted to the accessory gearbox. An IDG mounting flange (on the IDG), mates the IDG with the QAD. The QAD ring secures the IDG in a breech-type lockup.
3. Operation
_________
A. Functional Description (Fig. 2, Fig. 3)
______________________
(1)
The integrated drive generator (IDG) consists of an axial gear differential/hydraulic speed control section, and a generator section, mounted side-by-side in a single housing.
(2)
The axial gear differential/hydraulic speed control section in the IDG converts a varying engine input speed of 4,500-9,075 rpm, to a constant output speed of 12,000|150 rpm. The constant output speed allows the generator section of the IDG to produce ac power with a frequency of 400 |5-Hz.
(3)
A governor adjustment screw, on the IDG housing, allows one to fine tune the output speed of the hydraulic speed control section. This corrects IDG electrical frequency, if it falls outside the 400|4-Hz range.
(4)
The power generation section in the IDG converts mechanical power (from the IDG axial gear differential/hydraulic speed control section ), into electrical power. The generator outputs 115/200-volt, 3-phase, 90-Kva, 400-Hz ac power. This ac power is fed to the electrical system through four terminal studs on the IDG housing.
(5)
Each IDG is automatically controlled by a separate generator control unit (GCU). The GCU also works with flight compartment switches for manual IDG control (Ref 24-22-00). The GCU regulates IDG output voltage, and provides IDG protection (Ref 24-23-00). System status signals, shown on flight compartment indicators, are from the GCU.
(6)
Voltage on the generator side of the generator circuit breaker (GCB) is regulated by the generator control unit (GCU). The GCU maintains this point at 115 | 1 - volt ac, line-to-neutral, at 400 |4 - Hz, for loads up to 90 - Kva (Voltage is regulated within 115 | 1.5 -volts ac for loads up to 112.5 Kva). The GCU voltage regulator varies exciter field current flow in the generator to keep output voltage within these limits. Two electrical connectors on the IDG housing allow the GCU to control IDG output, and provide IDG permanent magnet generator (PMG) power to the GCU.
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