P6 PANEL
40 30
SEE B
TR 1 APU GEN
BAT
GEN 1TR 2 GEN 2
BAT GRDTR 3 INV
BATTERY BUS PWR STBY
STBY TEST
SWITCH
TESTPWR PWR
RESIDGALLEY
STANDBY
VOLTS
OFF
OFF
BAT
POWER OFF
ON ON
LIGHT
AC
12
LOW OIL
STANDBY LOW OIL DRIVE
2
1 1
PWR OFFPRESSURE PRESSURE
AA A
HIGH OIL
HIGH OIL
TEMP
STANDBY POWER
TEMP
A A
DISCONNECT DISCONNECT
BAT OFF AUTO
DRIVE TEMP
ELECTRONICS
STANDBY
RISE
EQUIPMENT RACK, POWER SWITCH
E3
IN
DRIVE CAN BE
RECONNECTED
STATIC INVERTER
ONLY ON
10 RISE 20 10 RISE 20
GRD
(E3-1)
30 3000
80IN120 80IN120
40 160 40 160
GEN DRIVE GEN DRIVE
OIL TEMP OIL TEMP
CC
ANNUNCIATOR
R37, R328, R356, R330 AND M562 MODULE, M238
(BACK OF PANEL
P6-2 COVER)
A
FWD
P6 PANEL
1 BEJ B-2535,B-2536 B
2 BEJ B-2580 AND ON
Standby Power System Component Location
Figure 1
A84566
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
6. Standby Power Relays (Fig. 1)
____________________
A. Standby power relay auto R37, standby power relay manual R328, standby power off relay R356 and standby power ind light relay R330 are in panel P6. Standby power relay manual directs static inverter output power to 115-volt ac standby power bus. Standby power relay auto directs either static inverter output power or 115-volt ac transfer bus power to 115-volt ac standby power bus. When the airplane is on the ground with the standby power switch in AUTO, ground sensing relay R38 is energized, providing a ground path to energize the standby power off relay (R356). With the standby power off relay energized, and the standby power switch in the AUTO or OFF position, the connection between the dc standby bus and the battery bus is broken, and if the transfer bus 1 is off the static inverter will not turn on because the turn-on signal path is disabled. Standby power ind light relay directs power to the standby power off light.
7. Standby Power Off Light (Fig. 1)
_______________________
A. The standby power off light on panel P5 illuminates whenever the standby power bus is de-energized.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
8. Operation (Fig. 2)
_________
A. Power to the ac standby power bus is received from 115-volt ac transfer bus 1 through energized relay R37 and relaxed relay R328. Relay R37 receives power fron 28-volt dc bus 1 and is grounded through transistor Q1 and standby power switch in AUTO position. Transistor Q1 is biased to gound when the voltage of 115-volt ac transfer bus 1 is 100 volts or more.
B. When the dc bus 1 loses power or the 115-volt ac transfer bus 1 voltage is less than 100 volts ac, Q1 is unbiased, R37 relaxes and connects the inverter output through normally closed contacts in R37 and R328 to the 115-volt ac standby bus.
C. With the STANDBY POWER switch the BAT position, R328 is energized by the hot battery bus and connects the inverter output to the ac standby bus.
D. The standby power off light L5 comes on when standby power ind light relay R330 relaxes, indicating the loss of power on the standby bus.
E. With the STANDBY POWER switch in the OFF position the system is
de-energized.
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