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* Battery charger sees a loss of connection to battery
* Battery overheat
* Battery temperature sensor open or shorted
* Battery not charged in time limits
* Battery voltage below lower limits.
The battery charger status light extinguishes and the battery
status light stays when this happens:
* Internal battery charger failure.
The battery charger fail maintenance message also shows on
P5-13 BITE.
DC GENERATION SYSTEM - BATTERY CHARGER
EFFECTIVITY
GUN 001-012, 016-099, 101-110, 115 24-31-00
Page 10
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-040
DC GENERATION SYSTEM - BATTERY CHARGER
DC GENERATION SYSTEM - BATTERY CHARGER
EFFECTIVITY
GUN 001-012, 016-099, 101-110, 115 24-31-00
Page 11
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-040
Purpose
The main battery charger has these two functions:
* Keeps main battery at maximum charge
* Supplies DC power to the battery buses.
The auxiliary battery charger keeps the auxiliary battery at
maximum charge.
General Description
Both battery chargers have the same part number. Each battery
charger has these two basic modes of operation:
* Battery charge mode (constant current, then constant
voltage)
* Transformer rectifier mode (constant voltage).
Each battery charger supplies constant current, variable
voltage power in the basecharge mode. After a transition
voltage is reached, the battery charger overcharges the battery
at a constant voltage, variable current. The battery charger
logic calculates the amount of overcharge. The total charge
time is less than 180 minutes.
In the transformer rectifier (TR) mode, the main battery charger
supplies constant voltage DC power to the hot battery bus and
the switched hot battery bus. The main battery also receives a
small trickle charge to help keep it at maximum charge. The
auxiliary battery charger does not supply power to the DC
buses in either mode. However, the auxiliary battery receives a
small trickle charge when the auxiliary battery charger is in the
TR mode.
The front face of each battery charger has two green status
lights (LED). One light is for the battery charger and the other is
for the battery. These lights are on when the battery and battery
charger are in operation.
Location
The main battery charger is on the E2 rack. The auxiliary battery
charger is on the E3 rack.
Functional Description
Each battery charger takes three-phase, 115v ac power and
changes it to DC power. Usually, each battery charger is in the
transformer rectifier mode. The battery chargers supply a
constant voltage output in this mode. Each charger can supply
up to 65 amps in this mode.
DC GENERATION SYSTEM - MAIN BATTERY CHARGER AND AUXILIARY BATTERY CHARGER
EFFECTIVITY
GUN 013-015, 111-114, 201-999 24-31-00
Page 12
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-31-00-041
A battery charger goes to the charge mode when its battery
voltage is less than 23v dc. In this mode, the charger supplies
constant current power. The output voltage is variable. During
the charge, the battery voltage rises until the voltage gets to the
transition voltage. The charger logic uses the battery
temperature at the start of charging to calculate the transition
voltage. The charger logic then calculates the length of the
overcharge period.
After the overcharge period, the charger goes into a
transformer rectifier mode with a constant 27.5v dc output.
The battery gets a trickle charge in this mode.
The battery charger goes into the charge mode again if any of
these occur:
* Battery charger input power is off for more than 1 second.
* Battery voltage is less than 23 volts.
You use the electrical meters, battery, and galley power module
to monitor the operation of each battery charger. The main
battery charger is in the charge mode when you see a positive
DC AMPS indication while the DC meter selector in the BAT
position. Use the AUX BAT position to monitor the auxiliary
battery charger.
The main battery charger cannot go into the charge mode
during any of these conditions:
* Fueling station door open
* APU start
* Standby power switch (P5-5) in the BAT position
* Standby power switch (P5-5) in the AUTO position, battery
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