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Load control consists of smart contactors, Solid State Power Controllers (SSPC) and control logic.
Smart contactors and SSPC are functionally similar to a control switch in series with a circuit breaker.
The status of all circuit breakers is monitored (trips are automatically displayed) and can be
acknowledged and reseted via the Electrical Management System (EMS). EMS Control Display Units
(CDU) are installed on the pilot’s and copilot’s side panel.
Page Number
Displays which page is selected and how
Line Select Keys many pages are available.
Used to select
displayed items.
Activation Keys
Used to switch
current status.
STAT Key
Displays the status of
tripped, out and locked
circuit breakers.
System Key
Displays circuit breaker
status by aircraft system.
BUS Key
Displays circuit breaker
status by electrical
busses.
PREV PAGE
Key
Scrolls list to
previous page.
NEXT PAGE
Key
Scrolls list to next
page.
CNTL Key
Displays system’s
control options.
TEST Key
Displays system’s
test options.
EMER CNTL
Key
Displays Bus
isolation status
Brightness
Control
If no action is taken within 2 minutes of
page activation or selection, the display
will automatically turn off and become
dark.
NOTE
Page Title
Displayed when a
selection has been
made using page
select key.
Page Select
Keys
GF0710_008
STAT SYS BUS PREV CNTL TEST
PAGE
NEXT
PAGE
EMER
CNTL
BUS
CIRCUIT BREAKER − SYSTEM 1/2
CIRCUIT BREAKER SYSTEM
AFCS
AIR COND/PRESS
APU
BLEED
CAIMS
COMM
DOORS
ELEC
ENGINE
FIRE
FLT CONTROLS
FUEL
BRT
ELECTRICAL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
07−10−9
ELECTRICAL MANAGEMENT SYSTEM (CONT'D)
The circuit breaker STATUS page will automatically appear anytime a circuit breaker trips (CB TRIP
message appears on EICAS). The STATUS page can be selected using STATUS page select key.
The circuit breakers will be displayed in the following sequence: TRIP, OUT then LOCKED.
CIRCUIT BREAKER − STATUS 1/1
DISPLAY UNIT 1 DC ESS LOCKED
CCBP
H STAB TRIM 1 AC 1 OUT
H STAB TRIM 2 AC ESS OUT
FUEL COMP B DC ESS OUT
RAD ALT 1 DC 1 TRIP
ACPC
LOCKED − Circuit breaker
has been locked by
maintenance personnel.
CCBP − Thermal
circuit breaker located
on Cockpit Circuit
Breaker Panel.
DC ESS − BUS location of
affected circuit breaker.
FUEL COMP B − Circuit
breaker identification
ACPC − Thermal circuit breaker
located on the component within ACPC.
OUT − Circuit breaker
has been selected out.
TRIP − Circuit
breaker has tripped.
GF0710_009
STAT SYS BUS PREV CNTL TEST
PAGE
NEXT
PAGE
EMER
CNTL
BUS
CIRCUIT BREAKER − SYSTEM 1/2
CIRCUIT BREAKER SYSTEM
RAD ALT 1
H STAB TRIM 1
H STAB TRIM 2
FUEL COMP B
DISPLAY UNIT 1
TRIP
OUT
OUT
OUT
LOCKED
DC 1
AC 1
AC ESS
DC ESS
DC ESS
ACPC
CCBP
BRT
ELECTRICAL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
07−10−10
ELECTRICAL MANAGEMENT SYSTEM (CONT'D)
The EMS CDUs are designed to be linked. When linked, a CDU (secondary) is operating exactly as
the controlling CDU (primary). A primary CDU controls itself and, when linked, the other CDU. The
following table identifies the possible relationships:
Link State EMS CDU
Pilot Copilot
Initial Power Up Secondary Secondary
Pilot CDU Linked Secondary Primary
Copilot CDU Linked Primary Secondary
Both unlinked Primary Primary
A CDU is considered secondary in the following conditions:
· At initial power up,
· A CDU display is turned on by pressing a function control key on the other CDU (except PREV
page key).
A CDU is considered primary in the following conditions:
· When any key of a secondary CDU is pressed,
· When in the TEST page, a selection is made on the other CDU,
· When the STAT page is selected.
An “S“ character is displayed in the lower left corner of the screen of a secondary CDU and an “M”
character in the lower left corner of the screen of a primary CDU.
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