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Selecting the switches to OFF/RESET will disconnect the respective generator from
the main AC buses. The OFF/RESET position can also be used to reset the generator
control circuit when a fault occurs.
Generator Control Unit
Each IDG is controlled and monitored by its respective generator control unit (GCU).
The GCUs provide protection and bus priority logic during normal and non-normal
operations. The engine generator is tripped off and removed from the AC buses if any
of the following conditions occur:
• over- and undervoltage
• over- and underfrequency
• generator and bus overcurrent
ELECTRICAL
For Training Purposes Only
May 03
7-5
P I LOT T R A I N I N G GU I D E
GEN 1 and GEN 2 Power
Figure 7-4
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
P604_07_028
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
ELECTRICAL
7-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
APU Generator
The APU generator supplies 115-volt AC, 400-Hz, three-phase electrical power to the
AC buses during ground operations with the engines off. The APU generator may also
be used in flight as a backup power source to the AC buses following a failure of both
engine generators. The APU generator is mounted on the APU generator adapter and
is driven at a constant speed, maintaining its frequency output at 400 Hz.
The APU generator is identified on the AC Electrical Synoptic page by the symbol
GEN above the APU icon (see Figure 7-5). The nominal rating of the APU generator
is 30 kVA from sea level up to the APU’s maximum operating altitude of 20,000 feet
MSL.
The two-position APU GEN switch located on the ELECTRICAL POWER Panel
controls the APU generator. Selecting the APU GEN switch to ON connects the APU
generator to the main AC buses, providing it is operating normally. Selecting the
switch to OFF/RESET disconnects the APU generator from the main AC buses. The
OFF/RESET position can also be used to reset the generator control circuit when a
fault occurs.
Use of the APU generator in flight is not permitted unless both
main generators have failed or are off-line.
Generator Control Unit
The APU generator is controlled and monitored by the APU generator control unit
(GCU). The APU GCU in conjunction with the engine GCUs provide protection and
bus priority logic during normal and non-normal operations. The APU GENERATOR
is tripped off and removed from the AC buses if any of the following conditions occur:
• over- and undervoltage
• over- and underfrequency
• generator and bus overcurrent
NOTE
ELECTRICAL
For Training Purposes Only
May 03
7-7
P I LOT T R A I N I N G GU I D E
APU Power
Figure 7-5
P604_07_029
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
6
113
400
KVA
V
HZ
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
ELECTRICAL
7-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
External AC Electrical Power
Description
The aircraft is capable of being powered by an external AC power source when both
engines and APU are off. External AC electrical is connected at a receptacle located
on the forward right side of the fuselage.
External AC Receptacle
Figure 7-6
Operation
External AC ground power is controlled by the EXT POWER switch/light located on
the ELECTRICAL POWER Panel. When connected, the external AC ground power is
　
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