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* When the K2 relay is closed, the BAT BUS ALT RLY (K1)
must be opened.
The K1 BAT BUS ALT RLY is closed and gives power to the
BATTERY BUS during these conditions:
* Battery switch is ON and TRU 3 does not have power (less
than 18v dc) for more than 0.1 seconds or
* STANDBY POWER SWITCH is in the BAT position.
DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-110, 115 24-31-00
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24-31-00-052
DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 111-114, 201-999 24-31-00
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DC GENERATION SYSTEM - BATTERY BUSES - FUNCTIONAL DESCRIPTION
24-34-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The standby power system supplies a nominal 28v dc and
single phase 115v ac to electrical buses which must have power
to maintain safe flight.
STANDBY POWER SYSTEM - INTRODUCTION
EFFECTIVITY
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STANDBY POWER SYSTEM - INTRODUCTION
STANDBY POWER SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 001-099, 101-115 24-34-00
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STANDBY POWER SYSTEM - INTRODUCTION
STANDBY POWER SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 201-999 24-34-00
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24-34-00-000
Purpose
During normal conditions, the standby power system supplies a
nominal 28v dc power to these buses:
* Battery
* DC standby
* Switched hot battery.
The standby power system supplies single phase 115v ac, 400
Hz power to the AC standby bus during non-normal conditions.
The battery and standby buses give power to systems that are
necessary to keep a safe flight. The standby system also gives
power for ground operations when there is no AC power.
General Description
The standby power control unit (SPCU) gives automatic and
manual control of the battery and standby buses. The SPCU
controls power distribution by these internal relays:
* Battery bus alternate relay (K1)
* Battery bus normal relay (K2)
* Standby DC alternate relay (K3)
* Standby normal relay (K5)
* Switched hot battery bus relay (K8).
The SPCU monitors the standby power system for faults. The
SPCU sends the fault data to these components where the ELEC
light comes on:
* Electrical meters
* Battery
* Galley power module (P5-13).
You use the P5-13 built-in test equipment (BITE) to see the fault
message data.
The amber STANDBY PWR OFF light on the P5-5 generator
drive and standby power module comes on if any one of these
buses loses power:
* AC standby bus
* DC standby bus
* Battery bus (when the battery switch is ON).
GUN 001-012, 016-099, 101-110, 115
The battery supplies at least 30 minutes of AC and DC power
when normal sources are not available. It supplies DC power to
the DC standby bus and battery buses. The battery uses the
static inverter to make AC power for the AC standby bus. The
inverter receives DC power from the battery through a remote
control circuit breaker (RCCB) in the J9. The RCCB is normally
closed, so the static inverter usually has power. This lets you
monitor the static inverter output on the P5-13.
STANDBY POWER SYSTEM - GENERAL DESCRIPTION
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