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Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL Introduction Vol. 1 07-
10-
2
REV 56, Jan 31/03
Electricalsystem warningsandcautions are displayed ontheEICAS primarypage.Status andadvisory messages are displayed ontheEICAS statuspage. General views ofthe electricalsystems are displayed on theEICAS,ACandDCsynoptic pages. TheACandDC synoptic pagesare accessedthroughtheEICAS controlpanel(ECP). Onepush ofthe ELECkey on the ECPwilldisplaythe ACsynoptic page. PushingtheELECkey asecond time willdisplaythe DCsynoptic page.
Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL Vol. 1 07-
10-
3
Introduction REV 56, Jan 31/03
Electrical Power Layout
Figure 07---10---1
Flight Crew Operating Manual MASTER
CSP A-
013
Vol. 1
07-
10-
4
ELECTRICAL
REV56,Jan 31/03
Introduction
External Service Panel Right Forward Fuselage
Electrical Power Panel Overhead Panel
Flight Attendant Panel
Control Panels
Figure 07 ---10 ---2
Flight Crew Operating Manual
MASTER
CSP A-
013
ELECTRICAL Vol. 1 07-
20-
1
AC Electrical System REV 56, Jan 31/03
1. AC ELECTRICAL SYSTEM
ACpower fortheaircraftelectricalsystems is providedbytwo engine-driven,integrated drive generators (IDGs)which supplypower toallACbuses during normaloperations. An APUgeneratorprovides abackupACpower source in flightif anIDGis inoperative or when theaircraftis on theground withtheengines off. IfallACpower is lostin flight, emergency ACpower is providedautomaticallyby adeployable air-driven generator(ADG). The AC distribution system is controlledbythe respective IDGandAPUgeneratorcontrolunits (GCUs). Eachgeneratoris monitoredbytheGCU’s forvoltage,frequencyandkilovolt amps (KVA)to provide systemfaultprotective shutdowns. An ACpowerdistribution schematic andsystem parameters are displayed on theEICASACsynoptic page.
A. Integrated Drive Generator (IDG)
EachIDG consistsof aconstant speeddrive (CSD)and agenerator. TheCSD uses an internaloilsystemtohydro-
mechanicallychangethe variable inputspeedfrom the engine accessorygearboxto a constantoutput speedtothegeneratortoproduce 115-
voltsACandto maintain aconstantfrequency of400Hz. Eachgeneratoris rated at30kilovoltamperes (KVA)upto an altitudeof35,000ft.,then 25KVAto 41,000ft.
Anoil cooler cools theoil usedbytheIDG. EachIDGis monitoredfor low oilpressure orhighoiltemperature. Inthe eventoflowoilpressure orhighoiltemperature, an (amber)FAULTlight(cover-
guarded)ontheEPSPwillilluminate. Liftingthe cover-
guardandpushingthe switchlightwill manuallydisconnecttheIDGfrom the engine gearbox.
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