(e)  
Make sure the DC-Volts for the main battery is more than 24 volts.

 (f)  
Make sure the charge mode for DC-Amps is positive (between 31 to 43 amps).

 (3)  
Remove electrical power, if it is not neccessary (Ref 24-22-00/201).

 S 864-013
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A
747-400 MAINTENANCE MANUAL
 MAIN BATTERY AND BATTERY TRANSFER RELAYS - REMOVAL/INSTALLATION
_______________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the main battery relay (R7223) or the battery transfer relay (R7224). The other task is the installation of the relay.
 B.  The tasks are the same for the two relays.
 C.  The installation task includes an operational test of the relays.
 D.  The relays are installed in the P180 DC power distribution panel. The P180 panel is between the nose gear wheel well and the fuselage, on the right side. Access to the P180 panel is through an access opening, forward of the E/E compartment.
 TASK 24-31-03-004-001
 2.  Main Battery and Battery Transfer Relay Removal (Fig. 401)_______________________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 24-33-07 Fig. 1

 (3)  
WDM 24-33-11, 24-33-12

 (4)  
SSM 24-33-01

 B.  
Access

 (1)  
Location Zone 116 Area Between Nose Gear Well and Fuselage, RH 271 Passenger Cabin, LH

 (2)  
Access Panel
 P180 DC Power Distribution Panel

 C.  
Procedure

 (1)
Make sure all electrical power is off (Ref 24-22-00/201).

 S 864-025

 (2)  
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.

 S 864-003
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A
747-400 MAINTENANCE MANUAL
SEE A
P180
P180-1
SEE B RELAY, R7223 MAIN BATTERY 
RELAY,BAT  R7224  TRANSFER TERY
SEE  B 
(4 LOCATIOSCREW NS) 
TERMINAL NUT  P180 DC POWER DISTRIB UTION PANEL 
WASHER  A 

____THE TERMINAL LEADS ARE
NOTE: DELETED FOR CLARITY.
TRANSFER RELAY (EXAMPLE)
B
Main Battery and Battery Transfer Relay Installation Figure 401
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747-400 MAINTENANCE MANUAL
 S 034-026
 (3)  
Disconnect the electrical connectors from the batteries:

 (a)  
Turn the knob on the main battery connector (DM7423A) counterclockwise until the connector is free from the main battery receptacle.

 (b)  
Turn the knob on the APU battery connector (DM7432A) counterclockwise until the connector is free from the APU battery receptacle.

 S 014-004
 (4)  
Open the access doors for the P180 panel.

 S 034-027

 (5)  
Disconnect the electrical leads from the relay:

 (a)  
Remove the nuts and washers that attach the electrical leads to the studs on the relay.

 (b)  
Disconnect the leads from the relay.

 NOTE: Put a tag on each electrical lead to identify the leads
____ when you install the relay.
 (c)  
Install the washers and nuts on the studs.
　
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