TRANSFR41 GEN PWR
BUS RECT CONT RELAY
GCU 2 APU GB 2 EPC 2
EXT PWR BUS
PROT PANEL

C811
TO
TRIPP6-12 CIRCUIT BREAKER
S12 CLOSE R351
PANEL
C802 GEN CIRCUIT28V DC SWITCHED
BREAKER 2
HOT BAT BUS

TRIP
C32

K2
CLOSE
FUELING & EXT PWR

NC
CONT
R10

P6-5 CIRCUIT BREAKER GCU 1 APU GB 1 EPC 1
REFUELING
PANEL
PWR SELECT
JUMPER

RLY (E3-3) TRIP
E
(PART CLOSE OF EXT C801 GEN CIRCUIT
TRIP
POWER
F
BREAKER 1
K1 EPCR
PLUG) TRIP TO TRIP
R6
P19 EXTERNAL POWER CLOSEPANEL CLOSECLOSE TO R348 OPENC801 GEN CIRCUITTRIP BREAKER 1 (P6) TRIP CLOSE
TRIP CLOSE TOR348
R348 EXT PWR
RLY (P6) CLOSE
K1 GEN 1C892 EPC 2K2 GEN 2CLOSE
RELAY R5 C891 EXTERNAL
RELAY TRIP C889 APU CIRCUITPOWER CONTACTOR 1
OFFOV
BREAKER 1 (P6)UVNSV
1
TRIP
CLOSE TRIP C891 EPC 1
ON
TRIP
EXTERNAL

S1
CLOSE
GROUND

R351 EPC 1 CLOSECLOSE
AUX RELAY
GRD POWER
POWER SW AVAILABLE
C802 GEN CIRCUIT
100 100
NSVBREAKER 2 (P6)
150GRD50 150
50
K801 TRIP
OV
ACPWRAC
AMPERES AMPERES
1 TRIP UNIT (P6)
R2
0 200 ON 0 200
UV G5 APU GEN CONT TOR348 CLOSE OFF CLOSE
1 OV-OVER VOLTAGE C892 EXTERNALUV-UNDER VOLTAGE C890 APU CIRCUITPOWER CONTACTOR 2P5-4 SYSTEM GEN AND APU PANEL G7 BUS PROTECTION PANEL (P6) NSV-NEGATIVE SEQUENCE VOLTAGE BREAKER 2 (P6)
External Power System Control Schematic
Figure 2 (Sheet 1)

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 ú ú 04 Page 3 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H53799
A 737-300/400/500MAINTENANCE MANUAL
28V DC
HOT BAT BUS
C1075
EXT PWR CONTROL

EPC 2 TRIP
28V DC

SIGNAL
BAT BUS

MD&T EPC 1 TRIP
B
C26 DC SIGNALBUS INDICATION
B
BATP6-5 CIRCUIT BREAKER R348 EXTERNAL
L1 GND PWR AVAILABLEPANEL P5-4 SYSTEM GEN AND APU PANEL POWER RELAY (P6) TRIP115V AC
EXT PWR TRANSFR41 GEN PWR GCU 2
BUS RECT
CONT RELAY
EXT PWR BUS
PROT PANEL

C811TRIP TO
CLOSE P6-12 CIRCUIT BREAKER
R351
S12 C802 GEN CIRCUITPANEL
BREAKER 2
28V DC SWITCHED

TRIPHOT BAT BUS K2 C32
FUELING & EXT PWR
NC
CONT GCU 1 R10 TRIP
P6-5 CIRCUIT BREAKER REFUELING
PANEL
PWR SELECT
JUMPER

RLY (E3-3) CLOSE
TRIP TRIP
E
(PART C801 GEN CIRCUIT
OF EXT BREAKER 1
POWER
F
K1 EPCR
PLUG) TRIP
TO R6 PANELP19 EXTERNAL POWER CLOSE CLOSETO R348
OPENTRIPC889 APUC801 GENTRIP
CIRCUITCIRCUITCLOSE
BREAKER 1 BREAKER 1 TO (P6) (P6) R348
CLOSE
CLOSE K1 GEN 1R348 EXT PWR
RLY (P6)
C892 EPC 2 C891 EXTERNAL
K2 GEN 2
RELAY POWER CONTACTOR 1
RELAY R5TRIP
OFF
TRIP TRIP UVOV
TRIP NSV
1
CLOSE
ON

C891 EPC 1
S1
EXTERNAL R351 EPC 1GROUND AUX RELAY
GRD POWER
POWER SW AVAILABLE
CLOSECLOSE
100 100
NSV
AC PWR AC

GRD 50
150 150
50
K801 C890 APUC802 GEN
OV TRIP
1 CIRCUIT CIRCUIT UNIT (P6)
AMPERES AMPERES
R2
0 200 ON 0200
UV G5 APU GEN CONT BREAKER 2 BREAKER 2 TO (P6) (P6)R348 CLOSE
OFF
1 OV-OVER VOLTAGEC892 EXTERNALUV-UNDER VOLTAGE POWER CONTACTOR 2P5-4 SYSTEM GEN AND APU PANEL G7 BUS PROTECTION PANEL (P6) NSV-NEGATIVE SEQUENCE VOLTAGE
External Power System Control Schematic
Figure 2 (Sheet 2)

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 24-41-00
 ú ú 04 Page 4 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H53834
A
737-300/400/500MAINTENANCE MANUAL
 E.  Ground Service Relay (Fig. 1)
 (1)  
The ground service relay R6 is in the P6 panel. Power to the ground service buses is controlled by the ground service relay. Setting the GROUND SERVICE switch on the cargo door attendant's panel to ON closes the ground service relay and connects the 115-volt ac ground service bus to external power. When the ground service relay is de-energized, the 115-volt ac ground service bus is connected to 115-volt ac gen bus 1.
　
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