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AC Utility Bus 2 AC UTLY BUS FEED 2
E2
AC UTLY BUS SENS AC UTILITY 2 E7
AC UTLY BUS CONT DC BUS 1 J4
AC Service Bus AC SERV BUS FEED AC SERV R2
Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL Vol. 1 07-
30-
1
DC Electrical System REV 56, Jan 31/03
1. DC ELECTRICAL SYSTEM
Five transformer rectifierunits(TRU’s)andtwo batteries (Main and APU)providethe aircraft withDC electricalpower. DCpower is also available through anexternalDCreceptacle on therightaftfuselage.
A. Transformer Rectifier Units (TRU)
There are five TRU’s locatedin thenose avionics compartment. EachTRU converts 115VACinputpower to28VDCoutputpower forpoweringtheaircraftDCbuses. The TRU’s are rated at100 amps. Normaldistribution oftheTRUoutputsis shown in the followingtable:
INPUT BUS TRU OUTPUT BUS
AC Bus 1 TRU 1 DC Bus 1 and DC Utility Bus 1
AC B 2ACBus 2 TRU 2 DC Bus 2 and DC Utility Bus 2
Essential TRU 2 DC Essential Bus and Battery Bus
AC Service Bus Service TRU DC Service Bus
AC Essential Bus Essential TRU 1 DC Essential Bus and Battery Bus
B. Batteries
The main andAPUnickel-cadmium batteries andtheir battery chargers are locatedin theaftequipment compartment. Thebatteries provide DCpowertotheir respective DC batterydirectbuses.
The 17AMP./HR, 24,volt main batteryprovidesbackuppower tothe attitudeheading reference system(AHRS), proximity sensing electronic unit(PSEU), data concentrator units (DCU’s), aircraft clocks, andthe APU electronic control unit(ECU).The main battery also provides power tothe flight compartmentlightingsystem.
The 17AMP./HR, 24volt, main batteryprovidesbackuppower totheinertial reference system(IRS), proximity sensing electronicunit(PSEU), data concentratorunits (DCU’s), aircraft clocks, andthe APU electronic control unit(ECU). The mainbattery also provides powertothe flight compartmentlightingsystem. <0025>
The 43AMP./HR, 24volt, APUbatteryprovidesthe cranking powerforstartingthe APU.
Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL DC Electrical System Vol. 1 07-
30-
2
REV 56, Jan 31/03
Battery chargers maintain thebatteries atfull charge. The main battery chargeris poweredfrom ACUtilitybus 1andthe APUbatterycharger ispoweredfromthe AC Utilitybus 2. Batterychargingis controlled automatically. Each charger monitors the battery voltageandtemperature to controlthebattery charge rate.If a battery reaches the overtemperature setpoint(as sensedbythe charger),the chargingwillstopto prevent overheating(thermal runaway).
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