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 B.  AIRPLANES WITH EXTENDED STANDBY POWER; The main and APU batteries are connected in parallel during the standby power operating mode (AMM 24-33-00/001).
 2.  Component Details (Fig. 1)_________________
 A.  Batteries
 (1)  The main and APU batteries are identical. They are nominal 24-volt DC, 20 cell, nickel-cadmium units, rated at 40 amp-hours. Battery weight is 96 pounds. The main battery is located in the forward equipment center. The APU battery is located in aft equipment center rack E6.
 B.  Battery Chargers
 (1)  The main and APU battery chargers are identical. Each charger operates from 115 volts, 3-phase, 400 Hz power supplied from the ac ground service bus. The battery chargers operate in three modes: the constant current charge mode, the constant voltage charge mode, and the T-R mode.
 (a)  
In the constant current charge mode, the charger provides a constant current charge of 38 amps to the battery. Battery temperature and battery voltage are sensed by the charger. As charging progresses, the battery voltage will rise. The charger measures the constant current charge time required to reach the voltage inflection point (approx. 31v dc at room temperature). When this point is reached, the charger starts an overcharge as a percentage of the base charge time.

 (b)  
After completion of the constant current charge and the overcharge, the charger starts the constant voltage charge. In this mode, the charger acts as a regulated power supply at

 27.75 volts dc with a current limit of 38 amps. The charger will supply the hot battery bus loads thus preventing slow depletion of the battery. The charger can recharge a completely discharged battery in 75 minutes.
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 24-31-00
 ALL  ú ú 03 Page 1 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
P5 PANEL
SEE

FLT COMPT

STANDBY POWER CONTROL PANEL

P6 PANEL
MAIN BATTERY
RELAY
MAIN BATTERY
TRANSFER RELAY
DC UNDER
VOLTAGE
SENSING
RELAY

 

MAIN BATTERY CHARGER DISABLE RELAY

MAIN BATTERY
CHARGER
DETECTION
RELAY

 

MAIN/APU BATTERY CHARGER DETECTION ENABLE RELAY

E6 - AFT EQUIPMENT CENTER RACK

Batteries Component Location
Figure 1 (Sheet 1)

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 24-31-00
 STANDBY POWER  ú
 ú  06  Page 2
 ú  May 28/99 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G38622
A

757 MAINTENANCE MANUAL
STANDBY POWER
CONTROL PANEL

P5 PANEL SEE C P11 PANEL
P6 PANEL 
MAIN BATTERY 
RELAY 
MAIN BATTERY 
TRANSFER RELAY 
DC UNDER 
FLT COMPT  VOLTAGE 
SENSING 
RELAY 
MAIN BATTERY 
CHARGER 
DISABLE RELAY 
BAT  STANDBY  MAIN BATTERY 
AUTO  CHARGER 
ON  OFF  BAT  DETECTION RELAY 
OFF  A  O  MAIN/APU BATTERY 
F  CHARGER DETECTION 
MAIN BAT DISCH A  APU BAT DISCH A  F A  ENABLE RELAY 

STANDBY POWER CONTROL PANEL
C
APU BATTERY E6 RELAY
CHARGER PANEL
ì APU APU
BATTERY BATTERY
CHARGER INTERLOCK
AFT CARGO  SHUNT RELAYDOOR (REF)
E6
EQUIP
AFT EQUIPMENT RACKAPU
CENTER
BATTERY SEE D
AFT EQUIPMENT CENTER AFT EQUIP CTR LOCATION
D
Batteries Component Location
Figure 1 (Sheet 2)

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 24-31-00
 STANDBY POWER  ú ú 02 Page 3 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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