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CL−604 Operating Manual
PSP 604−6
ALTERNATING CURRENT (AC) SYSTEM (CONT'D)
GEN 1 and GEN 2 Power
Figure 07−10−4
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 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 07−10−5). 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.
ELECTRICAL
Description
Vol. 2 07−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ALTERNATING CURRENT (AC) SYSTEM (CONT'D)
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.
On airplanes 5301 to 5630 not incorporating Service Bulletin 604−49−006 or
604−49−009.
NOTE
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, provides 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; or
• Generator and bus overcurrent.
ELECTRICAL
Description
Vol. 2 07−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ALTERNATING CURRENT (AC) SYSTEM (CONT'D)
APU Power
Figure 07−10−5
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.
ELECTRICAL
Description
Vol. 2 07−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ALTERNATING CURRENT (AC) SYSTEM (CONT'D)
External AC Receptacle
Figure 07−10−6
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 checked by an
external power monitor for proper voltage, frequency, and phase. When the external power is
within limits, the green AVAIL annunciator on the EXT POWER switch/light illuminates.
When the EXT POWER switch/light is pressed with the AVAIL annunciator illuminated, external
AC electrical power is connected to the aircraft main AC buses via the auxiliary power/external
power contactor (AP/EPC).
External AC ground power is identified on the AC electrical synoptic page by the symbol EXT
AC. This symbol appears only if external AC power is connected to the aircraft.
ELECTRICAL
Description
Vol. 2 07−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ALTERNATING CURRENT (AC) SYSTEM (CONT'D)
External AC Electrical Power
Figure 07−10−7
AC ELECTRICAL POWER DISTRIBUTION
Description
115-volt AC electrical power from the aircraft generators and APU generator is distributed to five
AC buses through circuit breaker panels. Monitoring of system status is done using the EICAS AC
electrical synoptic page.
ELECTRICAL
Description
Vol. 2 07−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
The aircraft AC bus system consists of the following five buses:
• AC BUS 1 (Main)
• AC BUS 2 (Main)
• AC ESS BUS (Essential)
• AC UTILITY BUS 1
• AC UTILITY BUS 2
EICAS AC Electrical Synoptic Page
Figure 07−10−8
Components and Operation
AC BUS 1 and AC BUS 2
AC BUS 1 and AC BUS 2 are the main AC buses of the aircraft, and receive power from any of
　
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