(2)
IPC 24-33-01 Fig. 61
(3)
WDM 24-33-12
(4)
SSM 24-33-01
B.
Access
(1)
Location Zone
222 Control Cabin, RH
(2)
Access Panel
P6 Main Power Distibution Panel
C.
Procedure
(1)
Make sure all electrical power is off (Ref 24-22-00/201).
(2)
Open the access doors for the P6 panel.
(3)
Disconnect the electrical connector (DR7228) from the relay.
S 024-022
(4)
Remove the relay:
(a)
Remove the four screws that attach the relay to the P6 panel.
S 864-002
S 014-004
S 034-005
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A
747-400 MAINTENANCE MANUAL
SEE A
SCREW (4 PLACES)
SEE B
P6 POWER DISTRIBUTION PANEL
A
ELECTRICAL
CONNECTOR DC VOLTAGE SENSE
RECEPTACLE RELAY (R7228)
B
DC Voltage Sense Relay Installation Figure 401
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747-400 MAINTENANCE MANUAL
(b) Remove the relay from the panel.
TASK 24-33-02-404-008
3. DC Voltage Sense Relay Installation (Fig. 401)___________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 24-33-01 Fig. 61
(3)
WDM 24-33-12
(4)
SSM 24-33-01
B.
Access
(1)
Location Zone
222 Control Cabin, RH
(2)
Access Panel
P6 Main Power Distribution Panel
C.
Install the DC Voltage Sense Relay
S 424-023
(1)
Install the relay:
(a)
Put the relay in its position on the P6 panel.
(b)
Install the four screws that attach the relay to the panel.
(c)
Tighten the screws.
S 434-011
(2)
Connect the electrical connector (DR7228) to the relay.
S 414-012
(3)
Close the access doors for the P6 panel.
D.
Do a Test of the DC Voltage Sense Relay
(1)
Supply electrical power (Ref 24-22-00/201).
S 714-024
(2)
Do a test of the relay.
(a)
Set the BATTERY switch, on the P5 panel, to OFF.
S 864-025
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747-400 MAINTENANCE MANUAL
(b)
Open this circuit breaker:
1) P6 Main Power Distribution Panel
a) 6A25 XFR RELAY STBY
(c)
Make sure the main EICAS screen operates correctly.
(d)
Open this circuit breaker:
1) P6 Main Power Distribution Panel
a) 6A26 XFR RELAY BAT
(e)
Make sure the main EICAS screen does not operate.
(f)
Close this circuit breaker:
1) P6 Main Power Distribution Panel
a) 6A25 XFR RELAY STBY
b) 6A26 XFR RELAY BAT
S 864-026
(3) Remove electrical power, if it is not necessary (Ref 24-22-00/201).
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