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circuit breaker, on the two control display units (CDU).
External AC power, supplied through the AC receptacle, situated at the aft left side of the airplane
(on the fairing at the root of the wing trailing edge) provides power to:
· AC bus 1, 2, 3 and 4.
· AC 1A, 2A, 3A and essential bus.
External DC power, supplied through the DC receptacle, situated at the aft of the airplane (adjacent
the aft service panel), provides power to the APU battery direct bus.
The APU can be started using external DC power.
The airplane batteries cannot be charged through external DC power.
ELECTRICAL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
07−10−1
EPGDS COMPONENTS
3
TRU
AVIONICS BATTERY
AND BATTERY CHARGER
RAT
DCPC
CCBP
ACPC
VFG
APU BATTERY
AND BATTERY CHARGER
APU START
CONTACTOR
ASSEMBLY(ASCA)
SPDA
GCU
1
2
4
EXT AC PANEL
EXT DC PANEL
GF0710_001
APU GENERATOR
ELECTRICAL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
07−10−2
EPGDS ARCHITECTURE
GEN
4
GEN
3
GEN
2
GEN
1
LH Engine
RH Engine
APU
GEN
GCU
GCU
GCU GCU
COCKPIT CIRCUIT BREAKER PANEL (CCBP)
AC POWER CENTER (ACPC)
RAT GEN GCU
ELECTRICAL
CONTROL
PANEL
AC EXT
POWER
EXT PWR
CONTROL
PANEL
TRU 1 TRU 2
ESS
TRU 1
ESS
TRU 2
APU
BATTERY
DC EXT
POWER
APU
START CONTROL
ASSEMBLY(ASCA)
DC POWER CENTER (DCPC)
SPDA 1 SPDA 2 SPDA 3 SPDA 4
EMS
CDU 1
EMS
CDU 2
APU
BATTERY
CHARGER
115/200 V, 3 PHASE, 324−596 Hz
28 V, DC
CONTROL, PROTECTION, COMMUNICATIONS
APU
START
MOTOR
GCU
AVIONICS
BATTERY
AVIONICS
BATTERY
CHARGER
GF0710_002
ELECTRICAL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
07−10−3
AC SYSTEM
AC power is normally supplied by four variable frequency generators (VFG), two on each engine,
rated at 115 volt, 40 KVA, 3 phase, 324−596 Hz output.
The generators are brushless, oil cooled and are a three stage machine type generator. The first
stage is a permanent magnet generator (PMG), generator excitation function, which provides output
power. The second stage is the main exciter which receives its field excitation through the generator
control unit (GCU).The GCU will remove the generator from its bus and deenergize
the generator, in
the event of malfunction. The third stage, is the main alternator, which incorporates current
transformers that are used for feeder fault and overcurrent protection.
All VFG output is routed through the AC power center (ACPC), which protects, controls and
distributes primary AC power to the main airplane busses. VFG output is then routed through the
CCBP to bus feeders 1, 2 and 3 and the AC ESS BUS for power distribution to the 4 transformer
rectifier units (TRU) and forward AC loads. Aft AC loads are fed directly from the ACPC. Each
generator normally powers its own bus, through a generator line contactor (GLC). Generator #4 also
powers AC ESS BUS. In the event of a generator malfunction, the generator transfer contactors
(GTC) will automatically switch to an alternate generator, to supply the affected bus. AC bus 2 and 3
are automatically shed during single generator operations.
AC power can also be supplied by the auxiliary power unit (APU) generator. The APU constant
frequency generator is rated at 115 volt, 40 KVA, 3 phase, 400 Hz output. The APU generator has a
ground power rating of 45 KVA continuous.
External AC power, 115 volt, 3 phase, can also be used to supply power to the AC system.
External AC Power
Receptacle
EXT AC
GROUND
SERVICE EXT DC
BATTERY
MASTER
LAMP
TEST HDPH MIC
APU
SHUT−OFF
AVAIL AVAIL
IN USE IN USE
ON ON
External AC/DC Power Status
Indicators
Displays status of external AC or
DC power.
Battery Master Status Indicator
Displays status of the battery master
switch (EMS or ON position).
Ground Service Mode Switch
Enables maintenance personnel to power selected AC
loads in the cabin, with AC external power connected.
External Service Panel
SERVICE
LIGHTS
OFF
GF0710_003
ELECTRICAL
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