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generator.
The GCU monitors IDG output power quality at three places:
GENERATOR DRIVE - GENERAL DESCRIPTION
EFFECTIVITY
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* Neutral current transformer (NCT) in the IDG, between the
generator and ground
* Differential protection current transformer (DPCT) between
the generator and generator control breaker
* At the feeder wires, just before the GCB (point of regulation).
The GCU uses DC power to excite the generator. The GCU
controls the excitation power to control the output power of the
IDG main generator. The GCU controls the generator control
breaker (GCB) as a function of power quality or manual control
input.
IDG Oil System
Pumps inside the IDG move the oil through the IDG and out
through two external coolers.
The air/oil cooler first uses engine fan air to decrease the
temperature of the IDG oil. The air/oil cooler has an internal
bypass which opens if the cooler becomes clogged.
The oil leaves the air/oil cooler and goes to the IDG oil cooler.
This cooler uses fuel to decrease the temperature of the IDG oil.
See the Fuel Distribution System section for more information
on the IDG oil cooler.
The oil returns to the IDG from the IDG oil cooler.
The high pressure bypass valve opens if the IDG oil cooler
becomes clogged.
The amber DRIVE light comes on if the IDG oil pressure is less
than the minimum operation limit or if there is an
underfrequency with the engine running. The GCU gets an
input from a low oil pressure switch in the IDG to monitor oil
pressure. The GCU monitors the PMG output for frequency and
a ready to load signal (RTL) from the DEUs for an engine run
signal.
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General
The components of the generator drive are on the engine and in
the flight compartment.
Integrated Drive Generator (IDG)
The IDG is on the front face of the engine accessory gearbox at
the 7:00 position. The IDG is below the engine starter.
You open the left engine fan cowl to get access to the IDG
installation.
When servicing, you can get access to the IDG through the IDG
servicing door in the left fan cowl.
IDG Air/Oil Cooler
The air/oil cooler is on the inside, aft portion, of the fan case at
the 6:30 position. You open the engine left fan cowl and thrust
reverser to get access to the air/oil cooler.
Generator Drive And Standby Power Module
The generator drive and standby power module is on the P5
forward overhead panel in the flight compartment.
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EFFECTIVITY
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Purpose
The integrated drive generators (IDG) are the normal source of
AC power generation in flight. There are two IDGs on the
airplane. Each supplies 115/200v ac, 400 Hz power. The IDG can
supply up to 90 KVA.
Physical Description
The IDG has a constant speed drive section and a generator.
The IDG weighs 117 pounds (53 kgs).
These are the components on the IDG that you service or
inspect:
* Push-to-vent valve
* Case pressure relief valve
* Electrical connectors
* Phase lead terminal
* Disconnect reset ring
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