The switches on these modules send signals to the LRUs that control portions of the system. The LRUs then energize or de-energize relays or breakers to control electrical power.
Breakers connect power to the buses. The breakers close when you give a command to the GCU to close it. The GCU closes the breaker only when power is good and no other power source is on the bus. These are the main breakers:
-External power contactor (EPC)
-APU power breaker (APB)
-Generator control breaker (GCB)
-Bus tie breakers (BTBs).
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DC AMP CPS FREQ
SYS
DATA
DC VOLTS / AC AMPS / AC VOLTS
EPC
BPCU
TR1
APU GEN
BAT
TR2 GEN1 GEN2
EXTERNAL POWER
BAT GRD TR3 INVPWR BUS
STBY TEST STBY TEST
PWR PWR
OFF
OFF
TO
BAT GALLEY
TRU 1 STATICSYS
ON
ON
INV
DC AC
P5-13 GCB 2
GCU 2
21
AC STDBY BUS
IDG 2
SYS
STANDBY POWER
STATUS
DISCONNECT DISCONNECT
TRU 2
BAT OFF AUTO
TO SYS DC STDBY BUS P5-5
SCU
TRU 3
GRD
PWR
OFF
ON
BUS TRANSFER
O
A
F
APB
U
SYS
T
O
F
AGCUSTATUS CHARGER
APU
DC1
STARTER-GENERATOR
BUSES SPCU
OFF OFF
ON ON
GEN 1 APU GEN
GEN 2
APU
P5-4
GCB 1 GCU 1 AC2 WITH DUAL BATTERY OPTION BATTERY
IDG 1 BUSES 737 GENERAL - ELECTRICAL POWER GENERAL DESCRIPTION
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737 GENERAL -- ELECTRICAL POWER COMPONENT LOCATIONS
General
Electrical power components are in these areas of the airplane:
-Flight compartment
-External power panel
-Forward lower fuselage
-EE compartment
-Engine
-APU compartment.
Flight Compartment
Modules on the P5 overhead panel supply these functions for the electrical power system:
-Manual control
-Indication
-DC and standby power system built-in-test
equipment (BITE).
The P6 and P18 panels have many electrical power system circuit breakers and relays.
External Power Panel
The external power panel is on the right side of the fuselage near the nose. The AC external power receptacle is on this panel.
Forward Lower Fuselage
Relays for the electrical power system and other airplane systems are located in junction boxes in this area.
EE Compartment
Many of the electrical components are in the EE compartment. These are just a few:
-Battery
-Battery charger
-Generator control units (GCUs)
-Bus power control unit (BPCU)
-Power distribution panels (PDPs)
-Start converter unit (SCU).
The GCUs and BPCU supply BITE for the AC electrical power and external power systems.
Engine
The integrated drive generators (IDG) are on the forward face of the engine accessory gearbox. The air/oil cooler is on the engine fan case.
APU Compartment
The APU starter-generator is on the APU gearbox.
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APU COMPARTMENT
-APU STARTER-GENERATOR
FLIGHT COMPARTMENT
-CONTROL SWITCHES
-INDICATIONS
-P6, P18 PANELS
-RELAYS -BATTERY CHARGER -JUNCTION BOXES -GENERATOR CONTROL UNITS (GCU)
EXTERNAL
POWER PANEL ENGINE
EE COMPARTMENT - INTEGRATED DRIVE GENERATOR (IDG) - AIR/OIL COOLER
FORWARD LOWER FUSELAGE - BATTERY
-
BUS POWER CONTROL UNIT (BPCU)
-
POWER DISTRIBUTION PANELS (PDP)
-START CONVERTER UNIT (SCU)
737 GENERAL - ELECTRICAL POWER COMPONENT LOCATIONS
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- ELECTRICAL METERS, BATTERY, AND GALLEY POWER MODULE THIS PAGE INTENTIONALLY LEFT BLANK
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- ELECTRICAL METERS, BATTERY, AND GALLEY POWER MODULE
General
You use the electrical meters, battery and galley power module (P5-13) for these functions:
-See electrical power parameters for AC and DC components or buses -Connect battery power to electrical buses with the battery switch -Supply and remove power to the galleys with the galley switch.
The module also has these BITE functions:
-Shows DC and standby power system failure indications -Monitors the dc and standby power and saves fault messages in memory. -Shows fault messages on the LED alphanumeric display.
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