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exciter field through the Generator Control Relay (GCR)
and the Generator Control Unit through a Rectifier
Unit.
The Generator Control Unit (GCU) supply from the
aircraft network is duplicated (Back up supply). The
supply is taken from the DC essential system.
The excitation control and regulation module keeps the
voltage at the nominal value at the Point Of Regulation
(POR).
GENERATOR OPERATION CONTROL
The generator is controlled by the corresponding
generator pushbutton. When pressed in, if the generator
speed is high enough, the generator is energized.
If the delivered parameters are correct (Power Ready
relay closed) the Generator Line Contactor (GLC) closes
to supply its network.
GENERATOR MONITORING
The FAULT light comes on when any generator parameter
is not correct or when the Generator Line Contactor
is open.
The generator failure signal is sent to SDAC 1 and 2
through the Electrical Generation Interface Unit
(EGIU). When the engine is shut down, the corresponding
GEN FAULT light is on.
NOTE: During the AVIONICS SMOKE procedure, the FAULT
light does not come on when the GEN1 LINE
pushbutton is set to off.
GENERATOR 1
To avoid complete loss of fuel pumps electrical supply
during the smoke procedure, the GEN 1 LINE pushbutton
is released out to open the line contactor.
Generator 1 is still excited and supplies fuel pumps
1LH and 1RH.
GENERATOR RESET
When the GEN pushbutton is released out after a fault
detection, the Generator Control Unit is reset.
The Generator Control Relay (GCR) and the Power Ready
relay (PR) are reset.
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AC GENERATION - AC MAIN GENERATION D/O
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SELF EXAMINATION
With the GEN 1 and 2 on line, when does the GEN 1
FAULT light come on?
A - As soon as the GEN 1 LINE pushbutton is
released out.
B - When any GEN 1 parameter is not correct.
C - When any GEN 1 parameter is not correct
and the GEN 1 pushbutton is released out.
When released out, what does the GEN 1 LINE
pushbutton enable?
A - To close GLC 1 and supply the fuel pumps
from the AC NORMAL BUS.
B - To open GLC 1 and supply the fuel pumps
from GEN 1.
C - To close the BTC and supply the fuel
pumps from the AC NORMAL BUS.
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24 - ELECTRICAL POWER
24-22-00 AC GENERATION - GENERATOR
CONTROL UNIT (GCU 1/2) D/O
CONTENTS:
General
Voltage Regulation
Control and Protection
Indications and Warnings
BITE
Self Examination
TMUELAL01 LEVEL 3
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AC GENERATION - GENERATOR CONTROL UNIT (GCU 1/2) D/O
GENERAL
The Generator Control Unit has four different
functions:
- Voltage regulation.
- Generator control and protection of the network
and generator.
- Control of the various indications and
warnings.
- System self monitoring and Test.
The GCU is supplied by the Permanent Magnetic Generator
(PMG).
The GCU is also supplied by the aircraft network
(Back-Up supply).
TMUELAL01-T01 LEVEL 3
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AC GENERATION - GENERATOR CONTROL UNIT (GCU 1/2) D/O - GENERAL
TMUELAL01-P01 LEVEL 3
EFFECTIVITY 24-22-00
Page 3
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AC GENERATION - GENERATOR CONTROL UNIT (GCU 1/2) D/O
VOLTAGE REGULATION
The voltage regulation is achieved by regulating the
generator excitation current.
It also supplies the exciter field through the
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