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Indication
You can see the output of each battery on the electrical meters,
battery and galley power module on the P5 forward overhead
panel. You see the voltage and current output of a battery with
the DC meter selector in the BAT position or AUX BAT position.
If the battery’s charger has power, you see the output voltage of
the battery or its battery charger, whichever is more.
The amber BAT DISCHARGE light comes on when any one of
these output conditions are true for either battery:
* Current draw is more than 5 amps for 95 seconds
* Current draw is more than 15 amps for 25 seconds
* Current draw is more than 100 amps for 1.2 seconds.
Master caution and the ELEC annunciator usually come on with
the BAT DISCHARGE light. The light goes out when the output
current goes below the limit for more than 1 second. Master
caution and the ELEC annunciator do not come on during a DC
power APU start.
DC GENERATION SYSTEM - MAIN BATTERY AND AUXILIARY BATTERY
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-051
Training Information Point
You remove a battery from the airplane before you do a battery
inspection or servicing.
DC GENERATION SYSTEM - MAIN BATTERY AND AUXILIARY BATTERY
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 24
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-051
DC GENERATION SYSTEM - MAIN BATTERY AND AUXILIARY BATTERY
DC GENERATION SYSTEM - MAIN BATTERY AND AUXILIARY BATTERY
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 25
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-051
Purpose
The dual battery remote control circuit breaker (RCCB) puts the
output of these in parallel:
* Auxiliary battery
* Auxiliary battery charger
* Main battery
* Main battery charger.
Location
The RCCB is inside the J9 junction box. J9 is in the EE
compartment, in front of the E2 rack.
General Description
The RCCB is normally open and closes when the SPCU signals
it to close. This lets the 28v dc battery bus bar receive power
from the main and auxiliary batteries at the same time.
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 26
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-069
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER
DC GENERATION SYSTEM - DUAL BATTERY REMOTE CONTROL CIRCUIT BREAKER
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 27
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-069
Purpose
The transformer rectifier units (TRU) change three-phase
nominal 115v ac, 400 hz input power into 28v dc to supply the
main DC system loads.
General Description
The DC generation system has three TRUs. Each TRU can
supply a continuous output load of 75 amps with forced air
cooling. The TRUs can supply 50 amps with convection cooling.
There are no external controls to the TRUs. The TRUs are the
same part number.
Location
The TRUs are in the EE compartment. TRU 1 is on the E2 rack.
TRU 2 and TRU 3 are on the E4 rack.
Indication
You may monitor output power for each TRU from the P5-13.
You can use the DC meter selector to select the TRU. TRU
output voltage and amperes show in the alphanumeric display.
The amber TR UNIT light comes to show a TRU failure. The light
comes on for any of these conditions:
* Any TRU fails on the ground
* TRU 1 fails in flight
* TRU 2 and TRU 3 fail in flight.
DC GENERATION SYSTEM - TRANSFORMER RECTIFIER UNIT (TRU)
EFFECTIVITY
GUN ALL 24-31-00
Page 28
D633A101-GUN Oct 10/2005
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)
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