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power to airplane. The system has automatic and manual
controls and protection. A standby AC and DC system gives
normal and emergency power.
AC Power
The electrical power system has four main AC power sources
and one standby power source. These are the main AC power
sources and their supply capacity:
* Left integrated drive generator (IDG 1) (90 KVA)
* Right integrated drive generator (IDG 2) (90 KVA)
* APU starter-generator (90 KVA below 32,000 feet/9,753
meters, and goes down to 66 KVA at 41,000 feet/12,496
meters)
* External power (90 KVA).
The IDGs and APU starter-generator supply a 3 phase, 115/200
volts (nominal) at 400 Hz. The AC power system design
prevents two sources to the same load at the same time.
The static inverter supplies a one phase, 115v ac output to the
AC standby bus.
DC Power
GUN 001-099, 101-110, 115
Three transformer rectifier units (TRUs) change 115v ac to 28v
dc. The airplane also has these DC power sources:
* Battery
* Battery charger.
The battery is the backup DC source if other sources do not
operate. The standby power control unit (SPCU) controls the
distribution of dc power.
GUN 111-114, 201-999
Three transformer rectifier units (TRUs) change 115v ac to 28v
dc. The airplane also has these DC power sources:
* Main battery
* Main battery charger
* Auxiliary battery
* Auxiliary battery charger.
The batteries are the backup DC source if other sources do not
operate. The standby power control unit (SPCU) controls the
distribution of dc power.
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ELECTRICAL POWER - POWER AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-00-00-001
Standby Power
GUN 001-099, 101-110, 115
With the loss of normal power, the standby power system
supplies a minimum of 30 minutes of AC and DC power to
systems necessary to maintain safe flight. The battery supplies
DC power. The static inverter uses battery power to make AC
power. The SPCU controls the distribution of AC and DC
standby power.
GUN 111-114, 201-999
With the loss of normal power, the standby power system
supplies a minimum of 60 minutes of AC and DC power to
systems necessary to maintain safe flight. The batteries supply
DC power. The static inverter uses battery power to make AC
power. The SPCU controls the distribution of AC and DC
standby power.
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Protection
The electrical power system uses automatic control to protect
the system from source failure or load failure. These line
replaceable units (LRUs) supply the system with protection and
control logic:
* Left generator control unit (GCU 1)
* Right generator control unit (GCU 2)
* APU generator control unit (AGCU)
* Bus power control unit (BPCU)
* Standby power control unit (SPCU)
* Start converter unit (SCU).
The GCUs monitor the system to control and protect the IDGs.
The APU GCU and the starter converter unit (SCU) work
together to control and protect the APU starter-generator. The
bus power control unit (BPCU) controls and monitors the use of
external power. The BPCU protects the airplane from external
power whose quality is out of limits.
Control
These modules on the P5 panel give manual control of the
electrical power system:
* Electrical meters, battery and galley power module (P5-13)
* Generator drive and standby power module (P5-5)
* AC systems, generator and APU module (P5-4).
The switches on these modules send signals to the LRUs that
control portions of the system. The LRUs then energize or deenergize
relays or breakers to control electrical power.
Breakers allow power to the buses. A breaker closes to let
power through it. The breakers close when you command the
GCU to close it. The GCU closes the breaker only when power
is good and no other power source is on the bus. The GCU
receives breaker position through the BPCU. These are the
main breakers:
ELECTRICAL POWER - POWER AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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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
24-00-00-001
* External power contactor (EPC)
* APU power breaker (APB)
* Generator control breaker (GCB).
The modules on the P5 also let you monitor the status of the
electrical power system. The panels have lights and an alphanumeric
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