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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 busses, 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
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−18
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, APU GEN, GEN 2.
· 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 busses.
External AC power will power all AC busses when selected ON and no other generator is powering
the AC busses.
The AC bus feed is displayed on the AC ELECTRICAL synoptic page as follows:
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−19
AC BUS FEED SYSTEM (CONT'D)
AC BUS 1
− Normally powered by GEN 1, alternately powered by the following, in descending
priority:
GEN 2
APU GEN
GEN 4
GEN 3
GEN 1
GF0710_022
GEN
1
GEN
4
GEN
3
GEN
APU
GEN
2
P
R
I
O
R
I
T
Y
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
GEN
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
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
GEN
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
AC BUS 1
AC BUS 1
GEN
1
GEN
2
GEN
3
GEN
4
AC ESS BUS
GEN
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
GEN
1
GEN
2
GEN
3
GEN
4
AC ESS BUS
GEN
V
KVA
0
0
0 HZ
APU
AC ELECTRICAL
V
KVA
V
KVA
115
12
V
KVA
V
KVA
AC BUS 1 AC BUS 4
V
KVA
0
0
GEN
2
GEN
3
GEN
4
GEN
APU
AC ELECTRICAL
AC BUS 1
AC BUS 2 AC BUS 3
AC BUS 4
AC ESS BUS
0
0
0
0
0
0
GEN
1
V
KVA
0
0
V
KVA
0
0
V
KVA
0
0
V
KVA
V
KVA
0
0
0
0
V
KVA
115
24
V
KVA
115
28
400 HZ
V
KVA
115
24
V
KVA
115
24
　
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