General
Test
BATTERY - STORAGE
Maintenance Practices Check Cleaning Installation Removal
BATTERY CHARGER
Removal/Installation
Adjustment/Test
Operational Test
CONNECTOR - BATTERY
Inspection/Check
INVERTER - STATIC
Removal/Installation
EXTERNAL POWER
______________ AC EXTERNAL POWER Description and Operation General Contactors - External Power Devices - Manual Control Distribution - External Power Panel - Bus Protection Panel - External Power Relay - Ground Service Operation Trouble Shooting
Chapter SectionSubject_______ Page____ Effectivity
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BEJ Page 6 Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CHAPTER 24 - ELECTRICAL POWER TABLE OF CONTENTS
_________________
Subject
_______
Adjustment/Test
Operational Test
PANEL - BUS PROTECTION
Removal/Installation
RECEPTACLE - EXTERNAL POWER Removal/Installation Inspection/Check
External Power Receptacle Check External Power Receptacle Inspection
ELECTRICAL LOAD DISTRIBUTION
____________________________
Description and Operation
General
115-volt ac System
28-volt ac System
28-volt dc System
MAIN 115-VOLT AC POWER
DISTRIBUTION
Description and Operation General Control - Transfer Bus
28-VOLT AC POWER DISTRIBUTION Description and Operation STANDBY POWER SYSTEM
Description and Operation General Inverter - Static Light - Standby Power Off Module - Voltage Sensor Relays - Standby Power Switch - Battery Switch - Standby Power Operation
Trouble Shooting
Adjustment/Test Operational Test Operational Test (1 mechanic) System Test Chapter SectionSubject
24-41-2124-41-11
24-50-00
24-51-00
24-52-0024-54-00
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24-CONTENTS
BEJ Page 7 Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CHAPTER 24 - ELECTRICAL POWER
TABLE OF CONTENTS_________________
Subject_______ Chapter SectionSubject_______ Page____ Effectivity___________
DC POWER DISTRIBUTION Description and Operation General Battery Control - Manual Relays - Control Units - Transformer -Rectifier Operation 24-55-00 1 111113 ALL
24-CONTENTS
BEJ Page 8 Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
ELECTRICAL POWER - DESCRIPTION AND OPERATION
____________________________________________
1. General (Fig. 1 and 2)
_______
A. The electrical power system consists of 28-volt dc, 28-volt ac, and 115-volt ac systems.
B. AC Electrical Power
(1)
Three isolated generators supply 115/200-volt, 3-phase, 400-Hz power. These generators are the primary sources of power for the main ac buses and the whole electrical power system. Two generators are driven by the engines and one generator is driven by the auxiliary power unit (APU).
(2)
External power, provided via the external power receptacle, supplies 115/200-volt, 3-phase, 400-Hz power.
(3)
Transformers provide power to the 28-volt ac buses by reducing 115-volt ac power to 28-volt ac power. Transformers are on shields J4 and J5.
(4)
A static inverter converts 28-volt dc battery power to 115-volt ac power. It supplies the flight critical loads on the ac standby bus when the primary power sources are off. The static inverter is in the electronics compartment on the electrical equipment shelf.
C.
DC Electrical Power
(1)
Three transformer-rectifier (T-R) units provide 28-volt dc power by converting 115-volt ac power to 28-volt dc power. T-R units are on electrical equipment shelf E3-1.
(2)
A battery provides 28-volt dc power to start the APU. Loads on the battery bus are powered by the battery when other power sources are de-energized. The battery is in electrical equipment area near the electrical equipment shelves.
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