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EFFECTIVITY
GUN 001-012, 016-099, 101-110, 115 24-31-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
24-31-00-055
DC GENERATION SYSTEM - TRANSFORMER RECTIFIER UNIT (TRU)
DC GENERATION SYSTEM - TRANSFORMER RECTIFIER UNIT (TRU)
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
24-31-00-055
THIS PAGE IS INTENTIONALLY LEFT BLANK
DC GENERATION SYSTEM - TRANSFORMER RECTIFIER UNIT (TRU)
24-31-00
Page 31
D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The DUAL BATTERY RCCB is normally open. When it is closed,
it lets the main battery and auxilary battery supply power to the
standby system in parallel.
Functional Description
The DUAL BATTERY RCCB receives control logic from the
SPCU. The DUAL BATTERY RCCB closes when these
conditions occur:
* APU switch is not in the start position and
* Relay K1 or K3 is energized.
When it is closed, the DUAL BATTERY RCCB receives power
from the auxiliary battery or auxiliary battery charger and sends
it to the 28v dc battery bus bar.
During an APU start the electronic control unit (ECU) sends a
signal to the SPCU. This causes the logic in the SPCU to open
the DUAL BATTERY RCCB.
Relay K1 will close if TRU3 fails and the standby power switch is
in the AUTO position. Relay K3 closes when AC transfer bus 1
or DC bus 1 does not have power. Both relays close when the
standby power switch is in the BAT position.
Training Information Point
The SPCU logic isolates the output of the batteries during a DC
APU start. The SPCU logic will not let a DC APU start open the
RCCB REMOTE circuit breaker. The RCCB REMOTE circuit
breaker is on the front of the SPCU and must be closed
manually if it is open.
When the RCCB REMOTE circuit breaker is open, the DUAL
BATTERY RCCB will not close and let the batteries operate in
parallel. In this condition, 60 minutes of standby power is not
available.
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 32
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-070
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER - FUNCTIONAL DESCRIPTION
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 33
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-070
Hot Battery Bus Power
The hot battery bus receives DC power from the battery through
a 28VDC bat bus bar in the J9 battery shield. There is a circuit
breaker on the SPCU that permits power to the bus.
GUN 001-099, 101-110, 115
The 28v dc battery bus bar receives DC power from the main
battery or the main battery charger.
GUN 111-114, 201-999
The 28v dc battery bus bar receives DC power from the main
battery or the main battery charger under normal power
conditions. On standby power the 28v dc battery bus bar
receives power from the main battery and the auxiliary battery.
GUN ALL
Switched Hot Battery Bus Power
The switched hot battery bus receives DC power from the 28v dc
battery bus bar through a circuit breaker on the SPCU and relay
K8 in the SPCU.
To get power to the switched hot battery bus, the battery switch
must be ON. When the battery switch is ON, K8 SW HOT BAT
BUS RLY closes and gives dc power to the bus.
With the forward airstair option, the K8 relay closes when the
airstair handle is put in the standby position.
The K8 relay gives DC power from the 28v dc battery bus bar to
the SPCU power supply.
Battery Bus Power
The battery bus receives power from the 28v dc battery bus bar
or TRU 3.
The BAT BUS NORM RLY (K2) is closed and gives DC power
from TRU3 to the battery bus when all of these conditions are
true:
* BATTERY SW ON
* STANDBY POWER SW not in BAT position
* TRU 3 gets more than 18v dc for more than 0.15 seconds.
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