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2 2
3
3 10 5 5 3 5 3 5
7.5 25 25 1
Row
Circuit Breaker
Panel Number Column
P604_07_006
ELECTRICAL
7-30 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The overhead ELECTRICAL POWER Panel and the Air-Driven Generator (ADG)
panel provide the system controls. The EICAS (AC Electrical and DC Electrical)
Synoptic pages provide a pictorial representation of system status. The EICAS
Primary and Secondary pages provide system caution and advisory messages
respectively. Circuit Breaker Panel (CBP) diagrams are also located in this section.
AC Electrical Power
ELECTRICAL POWER Panel
Figure 7-22
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
External AC Power Switch/Light (alternate-action)
Push
AVAIL Light
Illuminated
IN USE Light
Illuminated
– Connects external AC power to appropriate
main AC BUS(s) when the AVAIL light is illuminated.
– Indicates that external AC power is
connected and operating within limits.
– Indicates external AC power is connected
and supplying the appropriate main AC BUS(s).
AC ESS XFER Switch/Light (alternate-action)
Push
ALTN Light
Illuminated
– Manually transfers source of power for
AC ESS BUS from AC BUS 1 to AC BUS 2.
– Indicates AC ESS BUS is being
supplied from AC BUS 2.
AC AUTOXFER Switch/Lights (alternate-action)
Push
OFF Light
Illuminated
FAIL Light
Illuminated
– Disables automatic bus tie operation for
corresponding main AC BUS (left AC BUS 1,
right AC BUS 2).
– Indicates automatic bus tie operation has
been manually disabled.
– Indicates automatic bus tie operation has
been automatically disabled due to a bus fault or
generator overcurrent condition.
P604_07_025
GEN 1 (2) Switch
ON
OFF/RESET
– Connects applicable
generator to appropriate
main AC BUS(s) provided it
is operating normally.




Disconnects applicable
generator from main AC
BUS(s).
Resets generator control
circuit.
APU GEN Switch
ON
OFF/RESET
– Connects APU
generator to appropriate
main AC BUS(s) provided it
is operating normally.
: The APU GEN
generator may not be
selected ON in flight, unless
both GEN 1 and GEN 2 are
off-line or failed.
NOTE




Disconnects APU
generator from main AC
BUS(s).
Resets generator control
circuit.
ELECTRICAL
For Training Purposes Only
May 03
7-31
P I LOT T R A I N I N G GU I D E
Air-Driven Generator (ADG)
Air-Driven Generator (ADG)
Figure 7-23
ADG PWR TXFR
OVERRIDE
UNIT
ADG AUTO DEPLOY
CONTROL
LAMP
TEST
P604_07_027
ADG Manual Deploy Handle
Pull aft until latched:




Manually releases ADG
uplock mechanism to deploy
the ADG.
Immediately energizes the
Emergency AC Transfer
Contactor, Emergency DC
Transfer Contactor and the
Hydraulic Pump 3B Transfer
Contactor.
ADG LAMP-UNIT Test Switch
LAMP
UNIT:
– Tests the ADG TEST LAMP.
Tests continuity of the ADG uplock release
circuit and of the Emergency AC, DC and,
Hydraulic Pump 3B Transfer Contactors.
Tests the auto-deploy control unit logic circuits.




PWR TXFR OVERRIDE Switch
Push – De-energizes the
Emergency AC Transfer Contactor,
Emergency DC Transfer Contactor
and Hydraulic Pump 3B Transfer
Contactor if power is restored to
the main AC buses.
: ADG Manual Deploy
Handle must be stowed for all
transfer contactors to de-energize.
NOTE
ADG TEST LAMP
During LAMP Test
During UNIT Test






Illuminates steady.
On the ground, illuminates after 2
seconds for 2 seconds.
In-flight, illuminates after 5 seconds
for 2 seconds.
ELECTRICAL
7-32 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Electrical Power
ELECTRICAL POWER Panel
Figure 7-24
ELECTRICAL POWER
BATT MASTER EXT. POWER
　
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