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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-000
AC GENERATION - INTRODUCTION
AC GENERATION - INTRODUCTION
EFFECTIVITY
GUN 001-099, 101-115 24-20-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-000
AC GENERATION - INTRODUCTION
AC GENERATION - INTRODUCTION
EFFECTIVITY
GUN 201-999 24-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-000
THIS PAGE IS INTENTIONALLY LEFT BLANK
AC GENERATION - INTRODUCTION
24-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The AC generation system is a three-phase, four-wire system
that operates at a nominal voltage of 115/200 volts, 400 Hz. The
AC system has these four power sources:
* Integrated drive generator 1 (IDG 1)
* Integrated drive generator 2 (IDG 2)
* Auxiliary power unit (APU) starter-generator
* External power.
You operate the correct flight compartment switch to use a
power source. There is no automatic source selection. Priority
goes to the last selection.
Power Distribution
The AC part of the electrical system has separate left and right
systems (non-parallel). This means that two power sources
never supply power to the same AC transfer bus at the same
time. The left and right parts of the AC systems connect if only
one power supply is available. The bus power control unit
(BPCU) lets the left and right systems connect for any of these
conditions:
* Loss of power to the left or right transfer bus
* External power is the only source of electrical power
* APU power is the only source of electrical power.
Each AC transfer bus gets and distributes power to other buses.
Each AC transfer bus usually has power unless all AC sources
are not operating or you disconnect them.
The ground service buses get power in these two ways:
* You operate a switch in the flight compartment that closes
the EPC and BTBs and sends power through the transfer
buses
* You operate a switch at the forward attendant panel that
sends power to the ground service buses.
GUN 001-012, 016-099, 101-110, 115
The battery charger gets power from the ground service bus 2.
GUN 013-015, 111-114, 201-999
The main battery charger gets power from the ground service
bus 2. The auxiliary battery charger gets power from ground
service bus 1.
GUN ALL
The main buses get power from the transfer buses. The BPCU
controls power to the main buses. The BPCU opens the main
bus relay if power is more than limits.
GUN 001-012, 016-099, 101-110, 115
AC transfer bus 1 normally supplies power to the AC standby
bus. The AC standby bus alternatively gets power from the
static inverter. The static inverter gets power from the DC
system (battery or battery charger).
AC GENERATION - DISTRIBUTION AND AUTOMATIC CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 24-20-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-001
GUN 001-012, 016-099, 101-110, 115 (Continued)
GUN 013-015, 111-114, 201-999
AC transfer bus 1 normally supplies power to the AC standby
bus. The AC standby bus alternatively gets power from the
static inverter. The static inverter gets power from the DC
system (batteries or battery chargers).
GUN ALL
The transfer buses supply power to the galleys. The BPCU
opens galley breakers if the galley power is more than limits.
The transformer rectifier units (TRUs) take AC power and
change it to DC power for use by the DC system.
TRU 1 gets power from AC transfer bus 1. TRU 2 gets power
from AC transfer bus 2. TRU 3 usually gets power from AC
transfer bus 2. TRU 3 can get power from AC transfer bus 1 if the
TR3 transfer relay (TR 3 XFR RLY) energizes. This relay
energizes when AC transfer bus 2 de-energizes.
Each IDG supplies up to 90 KVA continuously. The external
power receptacle rating is 90 KVA. The APU starter-generator
supplies up to 90 KVA below 32,000 feet (9,753 meters). Above
32,000 feet the APU starter-generator rating decreases linearly
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