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APU GEN OVLD caution (amber)
Indicates that generator control unit has
detected a load of greater than 40 kVA.
APU GEN OFF caution (amber)
Indicates that APU generator is off and
APU is ready to load.
Primary Page
<0039>
<0039>
IDG 1 or 2 DISC status (white)
Indicates that IDG has been disconnected,
either automatically or manually.
Status Page
Vol. 1 07--20--9
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
AC Electrical System EICAS Indications (Busses) <MST>
Figure 07---20---5
<0039> <0006>
AC SERV BUS caution (amber)
Indicates that AC bus 2 is powered and
AC service bus is less than 90 Volts.
AC BUS 1 or 2 caution (amber)
Indicates that the associated bus is not
powered.
EMER PWR ONLY warning (red)
Indicates that the ADG has deployed.
AC ESS BUS caution (amber)
Indicates that AC essential bus is
less than 90 Volts.
AC 1 or 2 AUTOXFER caution (amber)
Indicates that the corresponding automatic
bus transfer has failed.
Primary Page
<0039>
<0039>
AC 1 or 2 AUTOXFER OFF status (white)
Indicates that the corresponding automatic
bus transfer has been selected off.
AC ESS ALTN status (white)
Indicates that AC essential bus is
being fed from AC bus 2.
AC UTIL 1 or 2 OFF status (white)
Indicates that corresponding AC
utility bus is not powered.
Status Page
REV 56, Jan 31/03
Vol. 1 07--20--10
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
Transformer Rectifier Units
Figure 07---20---6
TRU Load Readouts
Displays, in increments
of 1 amp, the load on
the rectifier.
EICAS
OUTLINE
GREEN WHITE AMBER HALF--INTENSITY
MAGENTA
Invalid data
Invalid data
Less than 18 VDC
Load less than
2 amp
Invalid data
18 VDC or greater Invalid data
Invalid data
18 VDC or greater
Load more than
2 amp
Less than 18 VDC
TRU failure
TRU failure
18 VDC or greater
Load more than
3 amp
18 VDC or greater
Load more than
3 amp
18 VDC or greater
Less than 18 VDC
Less than 18 VDC
Load less than
3 amp
Less than 18 VDC
Load less than
3 amp
TRU
1
TRU 2
Service
TRU
Essential
TRU 2
Essential
TRU 1
Ess
TRU 1
VA
Ess
TRU 2
VA
SERV
TRU 2
V
A
VA
TRU 2
V
A
TRU 1
TRU Voltage Readouts
Displays, in increments
of 1 VDC, the rectifier’s
voltage level.
DC ELEC Page
EICAS Secondary Display
Center Instrument Panel
EICAS DIGITAL
READOUT
GREEN WHITE AMBER DASHES
xx V Between 22 and 29 VDC Invalid data
Between 3 and 99 amp Invalid data
Less than 22 VDC or
more than 29 VDC
xx A Less than 3 amp or
more than 99 amp
_
_
_
AC BUS to TRU Flow
Lines
Green -- Respective
AC bus is powering
TRU.
TRU Output Flow
Lines
Green -- Respective
TRU is on--line and
output is 18 VDC or
greater.
Vol. 1 07--20--11
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
The AC essential bus is normally powered by AC bus 1. If a fault exists on AC bus 1,
the GCU will automatically transfer the power supplied to the AC essential bus, from AC
bus 1 to AC bus 2. The crew can also manually transfer the AC essential bus supply
power, from AC bus 1 to AC bus 2, using the AC ESS XFER switchlight on the electrical
panel. In flight, the AC service bus is normally powered from AC bus 2. On the ground,
it can be powered from the APU generator or from external AC power.
The AC service bus supplies power to those circuits necessary for ground--servicing
operations, without having to power the entire electrical system.
The AC utility buses are normally powered (in full configuration) by their respective AC
bus. In flight, the AC utility buses are automatically SHED if only one generator is
operational. In service configuration, the AC utility buses are powered from either the
APU generator or from external AC power.
D. AC Loads Distribution
AC BUS 1 AC BUS 2 AC ESSENTIAL
Hydraulic Pumps 2B and 3B
Left Windshield Heater
Probe Heaters (R) (AOA and
Pitot) and TAT
Left --Navigation, Landing and
　
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