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A
747-400
MAINTENANCE MANUAL
SEE A
SEE B
P414 POWER DISTRIBUTION CENTER - LEFT A
MAIN BATTERY CHARGER DISABLE RELAY
B
Main Battery Charger Disable Relay Location
Figure 3
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747-400
MAINTENANCE MANUAL
SEE A (REF) E-8 RACK
APU BATTERY CHARGER SEE SEE SEE D C B
A E-33 EQUIPMENT RACK
B
APU Battery, APU Battery Charger, and APU Battery Charger Disable Relay Location Figure 4 (Sheet 1)
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747-400
MAINTENANCE MANUAL
APU BATTERY
CONNECTOR
APU
BATTERY
ELECTRICAL CONNECTOR
C
APU BATTERY NOTE:RELAY LOCATED
CHARGER DISABLE IN P183 CIRCUIT
RELAYBREAKER/RELAY PANEL.
D
APU Battery, APU Battery Charger, and APU Battery
Charger Disable Relay Location
Figure 4 (Sheet 2)
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MAINTENANCE MANUAL
8. Main Battery and Battery Transfer Relays (Fig. 5)
________________________________________
A. The main battery relay connects the main and APU hot battery buses to their respective battery buses and switches the main battery charger into the TR mode when energized.
B. The main battery transfer relay connects the transformer rectifier unit No. 3 (DC bus 3) to the main and APU battery buses when energized.
9. APU Battery Bus Transfer Relay (Fig. 5)
______________________________
A. The APU battery bus transfer relay switches the APU battery bus from the APU hot battery bus to the main hot battery bus during APU start.
10. Operation (Fig. 6 and 7)
_________
A. Functional Description
(1)
Under normal ac input power characteristics and during charge and discharge operations, both of the battery/battery charger systems maintain 18.0 to 36.0 volts dc power at the terminals of the utilization loads connected to the hot battery buses. When the battery buses transfer to their respective hot battery buses, 18.0 to 29.5 volts dc power will be maintained at load equipment terminals supplied from the battery buses and hot battery buses.
(2)
During the TRU mode of operation, the battery/charger system will maintain 23.0 to 29.5 volts dc power at load equipment terminals supplied from the hot battery buses and battery buses.
(3)
When supplied with normal ac input power characteristics, the system voltage ripple will not exceed 0.5 volt peak to average.
(4)
The system utilizes a thermal sensing device internal to the battery to monitor the battery temperature. The battery charger uses the output of the thermal sensor to adjust the charge voltage inflection point for the battery overcharge timing, and to prevent charging if the battery temperature exceeds 144°F.
(5)
In addition to the charge inhibit function when the battery temperature is high, as described above, the system also uses a normally open thermal switch located in the battery to shut off the ac input power to the battery charger in the event that the temperature exceeds 155°F. The intent of this protection is to prevent thermal runaway. AC input power is interrupted by means of the battery charger disable relay.
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