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 ALL  ú ú 01 Page 213 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (3)  S 862-059Stop the engine (Ref 71-00-00/201).
 (4)  S 862-060Turn the BAT switch on the panel P5 to OFF.
 (5)  S 862-061Turn the dc meter switch on the P5-13 panel to the TR1 position.
 NOTE:____ The electrical power of the battery will decrease, if the dc meter switch stays in the BAT position for too much time.

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 ALL  ú ú 01 Page 214 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
737-300/400/500MAINTENANCE MANUAL
 DC GENERATION SYSTEM - DESCRIPTION AND OPERATION
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General (Fig. 1)
_______
 A.  115-volt ac power is converted to 28-volt dc power by three transformer-rectifier (T-R) units. A battery is used as a standby power supply for certain essential circuits and for short period dc loads when no basic power source is available. Other components of the dc generation system are the battery charger, dc system meters, dc annunciator lights, and the dc external power receptacle.
Transformer - Rectifier (T-R) Units (Fig. 1)
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 A.  The three T-R units are in the electronic compartment on shelf E3-1. T-R 1 and 2 receive 3-phase, 115-volt ac power from transfer buses 1 and 2, respectively. T-R 3 is fed from main bus 2, and provides power through dc tie bus to 28-volt dc buses 1 and 2. The three T-R units each have an output rating of 50 amps at 28 volts dc.
Storage Battery (Fig. 1)
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 A.  A 36 amp-hour nickel-cadmium storage battery is in the lower forward compartment to the left of the electronic compartment access door. The battery is charged from a charger adjacent to T-R 3 on shelf E3-1 of the electrical rack.
Battery Charger (Fig. 1)
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 A.  The battery charger is a regulated system to charge nickel-cadmium storage batteries. It operates from 115-volt, 400-Hz, 3-phase power.
 B.  The battery charger is on shelf E3-1 in the electronic compartment. The battery charger is capable of charging a completely discharged battery to 100 percent charge state within 1 hour. After the battery is completely recharged, the charger will count and limit the pulse charge to eight pulses. At the end of eight pulses, the charger will switch to a constant potential mode to maintain the battery at a 100 percent state-of-charge without undue gassing or overheating of the battery.
 C.  The battery charger will switch to the constant potential mode when the mode control loop is opened by any of the following.
 (1)  
Auxiliary relay to bat bus relay R327 energizes due to loss of T-R 3 output.

 (2)  
Standby power relay manual R328 energizes when STANDBY POWER switch is set to BAT.

 (3)  
Ground refueling power select relay R10 energizes when ac external power is connected to the external power receptacle.

 D.  
Input power to the battery charger is from 115-volt ac ground service bus or, if this bus loses power, from the 115-volt ac main bus 2.

 (1)  
The APU start interlock relay R39 disconnects battery charger input power when the APU start motor is turning. Input power is automatically restored when the APU reaches starter cutout speed.

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 ALL  ú ú 01 Page 1 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

BATTERY

BAC27DEX0895

DC Power System Component Location Figure 1
EXTERNAL POWER BREAKER TO BE OPEN EXCEPT WHEN USING POWER RECEPTACLE
　
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