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GEN 1 (2)(3)(4) OFF
Indicates that affected
generator is selected off.
EXT AC PWR ON
Indicates that external
AC power has been
selected on.
ELEC SYS FAULT
Indicates that a minor
fault has been detected
in the EMS.
APU GEN FAIL
Indicates that APU
GEN has failed.
EXT AC PWR AVAIL
Indicates that external
power is available.
GEN 1 (2)(3)(4) FAIL
Indicates a GCU fault in
the applicable generator
APU GEN OFF
Indicates that
APU GEN is selected off.
RAT GEN ON
Indicates that the RAT
generator is powering
the AC ESS BUS and is
RAT GEN OFF
Indicate that the RAT is
deployed and the RAT
generator is not powering the
AC ESS BUS.
GF0710_015a
APU GEN FAIL
ELEC SYS FAULT
EXT AC PWR AVAIL
CB TRIP
GEN 1 FAIL
GEN 2 FAIL
GEN 3 FAIL
GEN 4 FAIL
RAT GEN ON
AC BUS 1 MAN OFF
AC BUS 2 MAN OFF
AC BUS 3 MAN OFF
AC BUS 4 MAN OFF
APU GEN OFF
EXT AC PWR ON
GEN 1 OFF
GEN 2 OFF
GEN 3 OFF
GEN 4 OFF
RAT GEN OFF
the only online generator.
ELECTRICAL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
07−10−14
AC SYSTEM SYNOPTIC
Electrical system warnings, cautions, advisories and status messages are presented on the EICAS
primary display. General views of airplane electrical systems (either AC or DC) are presented
through synoptic diagrams on the EICAS secondary display (after selecting the appropriate key on
the EICAS control panel).
Generator Output
Flow Line (Lower)
Green − Generator is on.
Blank − Generator is off.
Generator Output
Flow Line (Upper)
· Green − Generator
line contactor at generator position.
· Blank − Generator
line contactor at tie position.
Generator Voltage
Readout
Displays, in VAC, the
generator voltage level.
· Green − 100−125 VAC
· Amber − GCU fault
· White − GEN off
· Magenta − Invalid data.
Generator Load
Readout
Displays in KVA, the load
on the generator.
APU Generator
Frequency Readout
Displays, in Hz, the
generator frequency level.
EICAS Control Panel GF0710_018
AC BUS 1
V
KVA
115
12
GEN
1
GEN
2
AC BUS 2
V
KVA
115
12
GEN
3
AC BUS 3
V
KVA
115
12
V
KVA
115
15
GEN
4
AC BUS 4
AC ESS BUS
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
GEN
The AC electrical page contains digital readouts of generator output voltage, frequency (APU only),
load in KVA, input/output flow on the buses, general status indications via color logic and the
following messages:
· SHED message − Corresponding AC bus has been shed.
GF0710_019
AC BUS 2 AC BUS 3
SHED SHED
ELECTRICAL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
07−10−15
AC SYSTEM SYNOPTIC (CONT'D)
· AC BUS 1, 2, 3, 4 MAN OFF icon − Corresponding AC bus is isolated.
· AC BUS 1, 2, 3, 4 MAN OFF status message displayed on EICAS.
NOTE
A maximum of 3 buses only can be
manually isolated concurrently.
GF0710_020
AC BUS 1
MAN OFF
AC BUS 1 MAN OFF
AC BUS 2 MAN OFF
AC BUS 3 MAN OFF
AC BUS 4 MAN OFF
AC BUS FEED SYSTEM
Each AC bus is normally powered by its own generator through generator line contactors. In the
event of a generator malfunction, the priority system will automatically provide an alternate generator
(feed), to power that bus (APU must be started to be available to the feed system), through generator
transfer contactors.
The AC busses are normally powered by their own generator, but can be powered by alternate
generators in the following descending order:
· AC BUS 1 − GEN 1, GEN 4, GEN 3, GEN 2, APU GEN.
· AC BUS 2 − GEN 2, GEN 3, GEN 4, APU GEN.
· AC BUS 3 − GEN 3, GEN 2, GEN 1, APU GEN.
· AC BUS 4 − GEN 4, GEN 1, GEN 2, GEN 3, APU GEN.
· AC ESS BUS − RAT GEN (if deployed), GEN 4, GEN 1, GEN 2, GEN 3, APU GEN. Normal
power for AC ESS BUS is generator 4. When the RAT is deployed and RAT GEN is ON the
AC ESS Bus is fed directly from the RAT GEN.
AC busses 2 and 3 are automatically load shed when a single generator is powering the buses.
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