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system and external power operation.
REV 56, Jan 31/03
Vol. 1 07--10--2
ELECTRICAL
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Electrical system warnings and cautions are displayed on the EICAS primary page. Status
and advisory messages are displayed on the EICAS status page. General views of the
electrical systems are displayed on the EICAS, AC and DC synoptic pages. The AC and DC
synoptic pages are accessed through the EICAS control panel (ECP). One push of the
ELEC key on the ECP will display the AC synoptic page. Pushing the ELEC key a second
time will display the DC synoptic page.
Vol. 1 07--10--3
REV 56, Jan 31/03
ELECTRICAL
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
Electrical Power Layout
Figure 07---10---1
IDG 1
IDG 2
APU GENERATOR
EXTERNAL DC
CONNECTION
APU BATTERY
MAIN BATTERY
TRANSFORMER
RECTIFIER
UNITS
EXTERNAL AC
CONNECTION AIR DRIVEN
GENERATOR
REV 56, Jan 31/03
Vol. 1 07--10--4
ELECTRICAL
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Control Panels
Figure 07---10---2
Electrical Power Panel
Overhead Panel
External Service Panel
Right Forward Fuselage
Flight Attendant Panel
Vol. 1 07--20--1
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
1. AC ELECTRICAL SYSTEM
AC power for the aircraft electrical systems is provided by two engine-driven, integrated
drive generators (IDGs) which supply power to all AC buses during normal operations. An
APU generator provides a backup AC power source in flight if an IDG is inoperative or when
the aircraft is on the ground with the engines off. If all AC power is lost in flight, emergency
AC power is provided automatically by a deployable air-driven generator (ADG). The AC
distribution system is controlled by the respective IDG and APU generator control units
(GCUs). Each generator is monitored by the GCU’s for voltage, frequency and kilovolt amps
(KVA) to provide system fault protective shutdowns. An AC power distribution schematic
and system parameters are displayed on the EICAS AC synoptic page.
A. Integrated Drive Generator (IDG)
Each IDG consists of a constant speed drive (CSD) and a generator. The CSD uses an
internal oil system to hydro--mechanically change the variable input speed from the
engine accessory gearbox to a constant output speed to the generator to produce
115--volts AC and to maintain a constant frequency of 400 Hz. Each generator is rated
at 30 kilovoltamperes (KVA) up to an altitude of 35,000 ft., then 25 KVA to 41,000 ft.
An oil cooler cools the oil used by the IDG. Each IDG is monitored for low oil pressure
or high oil temperature. In the event of low oil pressure or high oil temperature, an
(amber) FAULT light (cover--guarded) on the EPSP will illuminate. Lifting the
cover--guard and pushing the switchlight will manually disconnect the IDG from the
engine gearbox.
The IDG will automatically disconnect if a severe oil overtemperature or overtorque
condition occurs. Once disconnected, either manually or automatically, the IDG cannot
be reconnected in flight. If the IDG was disconnected manually, it can only be reset on
the ground, with the engine shutdown. If the IDG was disconnected automatically, it
must be replaced.
Each generator control unit (GCU) controls and monitors the related AC generator
system and provides voltage and frequency regulation and fault protection for its
respective generator. The GCU also protects the electrical system from overcurrent
and differential current faults. In the event of a malfunction, the GCU will automatically
disconnect the faulty generator from the respective AC buses. The generator may be
reset when the malfunction is corrected or no longer exists, by selecting the generator
switch to the OFF/RESET position then back to ON.
B. APU Generator
The APU generator is driven, directly by the APU gearbox, at a constant speed to
maintain a constant frequency output. The generator provides 115--volts, 400 Hz AC
power and is rated at 30 KVA from sea level to 37,000 ft. A GCU, identical to the IDG
GCU, provides the same regulation and protection functions as the IDG GCUs.
C. AC Distribution
Two different configurations of AC power distribution are available, Full configuration
and Service configuration.
REV 56, Jan 31/03
Vol. 1 07--20--2
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
In Full configuration, all the AC buses are powered using either IDG 1, IDG 2, the APU
　
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