INPUT DRIVE
DISCONNECT DRIVE DISCONNECTRESETHANDLE
TRIM COIL
CHARGE PRESS. SWP
OUTPUT TO GCU
140 PSI OIL IN
CHARGE PRESS.
SWITCH
INPUT
GOVERNOR
DISCONNECT
SOLENIOD
TRIM COIL
T
CONTROL INLET OILAIR EXHAUST ADD SUBTRACTCYLINDER TEMP SENSORFUEL/OIL
FIXED OUTPUT TO GCU
COOLER 250 PSI
SLIPPER WOBBLER VARIABLE
SUMP EXTERNAL OIL
CHARGE 250
WOBBLER CIRCUIT BYPASS
DE-AERATOR
PRESS.
PSID
VALVE
RELIEFVALVE TWIN HYDRAULIC LOGS
AIR/OIL HEATEXCHANGER
CHARGEPUMP
OUTPUT OILSUMP
TEMP SENSOROUTPUT TO GCU
1
INPUT
OIL OUT DISCONNECT
SUMMING
2
GEAR
SCAVENGEFILTER
60 PSID
DELTA PRESSURESUMMING
INDICATOR
GEAR
3
INPUT
DIFFERENTIAL
INPUT
SPEED
SHEAR
SENSOR
SECTION
IDG PRESSUREOUTPUT INPUTTRIM
FILL PORT MAIN GEARBOX
CHARGE
PRESSURE
PMG OUTPUT TO GCUMONITOR
BOSS SPEED SENSOR OUTPUTTO GCU
350 PSI
SCAVENGE
MAIN EXCITER INPUT FROMPRESS.
GCU RELIEF
SCAVENGE
PUMPS
VALVE
MAINEXCITER ALL-
DIFFERENTIAL PROTECTIONATTITUDE
CURRENT TRANSFORMEROIL HOLDING
OUTPUT TO GCU
1 OIL FOR LUBRICATIONTANK
MAIN
AND CONTROL
GEN
NEUTRAL
2 OIL FOR LUBRICATION
3
4
AND COOLING
3
OIL FOR LUBRICATION PHASE C
4
OIL FOR COOLINGPHASE B
MAIN GENERATORINLET PRESSURE
PERMANENT CURRENT
OUTPUT TO GCBGENERATOR
MAGNET TRANSFORMERS PHASE ASUPPLY PRESSURE
OVER FLOW
CHARGE PRESSURE
DRAIN OIL LEVEL
SIGHT GAUGE TERMINAL
CONTROL PRESSURE BLOCK
INTEGRATED DRIVE GENERATOR
SCAVENGE PRESSURE
Generator Drive System Block Diagram
Figure 2 (Sheet 4)
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MAINTENANCE MANUAL
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747-400
MAINTENANCE MANUAL
(2) The axial gear differential/hydraulic speed control section in the
IDG converts a varying engine input speed of 4,650 - 9,200 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 |5 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 output is 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 monitored by its respective generator control unit
(GCU). The GCU also works with flight compartment switches for
manual IDG control (Ref 24-22-00/201). The GCU regulates system
control of the IDG output voltage, frequency and protection (Ref
24-23-00/001). The GCU also provides system status signals to the
EIUs and to the CMCS via the BCU.
(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 volts ac, line-to-neutral, 400 |5 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
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