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uses inputs from the flight compartment and system monitoring
to control DC power sources and distribution.
Power Distribution
The DC power distribution system is in the power distribution
panels (PDPs) and in the SPCU.
DC GENERATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DC GENERATION SYSTEM - GENERAL DESCRIPTION
DC GENERATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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DC GENERATION SYSTEM - GENERAL DESCRIPTION
DC GENERATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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Purpose
The battery charger has two functions:
* Keep battery at maximum charge
* Supply DC power to the battery buses.
General Description
The battery charger has two basic modes of operation:
* Battery charge mode
* Transformer rectifier mode (constant voltage).
The battery charger keeps the battery at maximum charge.
When not in the charge mode, the battery charger supplies
constant voltage DC power to the hot battery bus and the
switched hot battery bus. The design of the DC generation
system protects the battery charger from overload.
The front face of the battery charger has two green status lights
(LED). One light is for the battery charger, the other for the
battery. These lights are on when the battery and battery
charger are in operation.
Location
The battery charger is in the EE compartment on the E2 rack.
Functional Description
The battery charger takes 3 phase, 115v ac power and converts
it to DC power. Usually, the battery charger is in the transformer
rectifier mode. The battery charger supplies a constant voltage
output in this mode. The charger can supply up to 65 amps in
this mode.
The battery charger goes to the charge mode when its battery
voltage goes below 23v dc. In this mode, the charger supplies
constant current power. The output voltage is variable, the
current output is approximately 50 amps. During the charge, the
battery voltage rises until the voltage gets to the inflection point.
The charger logic uses the battery temperature at the start of
charge to calculate the inflection point. 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 will go into the charge mode again if any of
these occur:
* The battery charger input power is off for more than 1
second.
* The battery voltage goes below 23 volts.
DC GENERATION SYSTEM - BATTERY CHARGER
EFFECTIVITY
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24-31-00-040
You use the electrical meters, battery and galley power module
to monitor the operation of the battery charger. The battery
charger is in the charge mode when you see a positive DC
AMPS indication while the DC meter selector in the BAT
position.
The battery charger cannot go into the charge mode during any
of these conditions:
* Fueling station door open
* APU start
* Standby power switch (P5-5) to the BAT position
* Standby power switch (P5-5) to the AUTO position, battery
switch ON, and DC BUS 1 and AC TRANSFER BUS 1 do not
have power
* Battery overheat.
Status Lights
Both status lights are usually on when the battery charger has
input power. A malfunction with any of these components
makes one or both status lights extinguish:
* Battery charger
* Battery
* Connection wiring.
Both status lights extinguish if any of these conditions are true:
* Input power to battery charger goes away, or
* Input voltage to battery charger goes below 94 volts ac for
more than .5 seconds.
The battery charger status light remains on and the battery
status light extinguishes if any of these conditions are true:
　
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