(5)
The overfrequency and underfrequency circuits are set to operate at 425 to 435 Hz and 360 to 370 Hz respectively. A time delay of 0.25 to 0.60 second prevents transients from the generator causing the GB to trip. The circuit also provides for a lockout of undervoltage protection during normal shutdown of the system.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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115V ACGEN 1 OA
OB
OC L7
L8
S3 OA
OB
OC
TO N238
ANN LTS
MDL MAN
TRIP LT TO APU
DIFFERENTIALPROTECTION
EPCCLOSE
APU
GB
CLOSE
C889 APU GEN DIFFNC BKR 1 PROT
TEST
POINT C891 EXTERNALPOWER CONTACTOR 1MANUAL TRIP OR EP TRIP
APU GB TRIP TRIP
TO G7
D58 PIN 15
OV - OVER VOLTAGEUV - UNDER VOLTAGEOF - OVER FREQUENCYUF - UNDER FREQUENCYDP - DIFFERENTIAL PROTECTIONOC - OVER CURRENT TR
CONTROLPOWER
28V DC C4SUPPLY
CONTROL
GENERATOR 1
(P6-4)
TRIP
P6 LOAD CONTROL - RIGHT
CLOSE OFFP5-5 D1086K602 GCR PIN 50 (CSD)LOCKOUT K603GCR TO M400 OCDP
OV NORM TRIPUV TO G3 FIRE SEE
FIG. 6
S8 ENG 1 FIRESWITCH (P8)
ON
S3 GEN 1 SWRESETK601 TO VOLTAGESEEREGULATOR
TO K2TO G724-41-00(P6)FIG. 2
TO S4
TO K801
(G5) K801PR
K1 GEN 1
RELAY
P5-4 AC SYSTEM GEN ANDAPU PANEL K3/K4 28V DCLOGIC
K604 GB TRIPCONTROL
G5 APU GENCONT UNIT G3 GENERATOR CONTROL UNIT 1 (P6)
Generator Control Simplified SchematicFigure 3 (Sheet 1)
BUS TRANS OA
TRANSFER
TRANSFER
BUS OFF
FU
BUS OFF
BUS
F T
O
BUS
OFF
OFF
GEN OFF
GEN OFF
BUS
APU GENBUS
OFF BUS
OFF OFF
ON ON
GEN 1 APU GENGEN 2
APU
P5-4 AC SYSTEM GENERATORAND APU PANEL
TRIP
115V ACGEN BUS 1
R349 XFRCONT RLY 1 MASTER
CAUTION A
MASTER TESTAPRESS TO TEST
L7 BUS 1 OFF LIGHTMASTER DIM
B
B
TOL8 GEN 1 OFF BUS LIGHT
R349TRANSFERP5-4 AC SYSTEM GENERATOR ANDCONTROLAPU PANELRELAY
NOTE: GENERATOR 1 SCHEMATIC SHOWN.GENERATOR 2 APU GENERATORSCHEMATICS SIMILAR.
CLOSE
C801 GENERATOR BREAKER 1
(RIGHT SIDE-NOSE
WHEEL WELL)
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT SB 24-1115 ú
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H54796
115V ACGEN 1
OA
OB
OC
TO N238ANN LTSMDL MANTRIP LT
NCMANUAL TRIP OR EP TRIP
APU GB TRIP
TO G7
D58 PIN 15
OV - OVER VOLTAGEUV - UNDER VOLTAGEOF - OVER FREQUENCYUF - UNDER FREQUENCYDP - DIFFERENTIAL PROTECTIONOC - OVER CURRENT TR
CONTROL
28V DC
POWER
C4SUPPLY
CONTROL
GENERATOR 1
(P6-4)
TRIPP6 LOAD CONTROL - RIGHT
P5-5 D1086
CLOSE OFFK602 GCR PIN 50 (CSD)LOCKOUT K603 GCR TO M400OCDP
OV NORM TRIPUV TO G3 FIRE SEE
FIG. 6 S8 ENG 1 FIRESWITCH (P8)
ON
S3 GEN 1 SW RESETK601 TO VOLTAGESEE REGULATOR
TO K2TO G7
24-41-00(P6)
FIG. 2
TO S4
TO K801
(G5) K801PR
K1 GEN 1
RELAY
P5-4 AC SYSTEM GEN ANDAPU PANEL K3/K4 28V DCLOGIC
K604 GB TRIPCONTROL
G5 APU GEN
CONT UNIT G3 GENERATOR CONTROL UNIT 1 (P6)
Generator Control Simplified SchematicFigure 3 (Sheet 2)
L7
L8
S3 .A
.B
.C TO APUDIFFERENTIALPROTECTION
EPCCLOSE
APU
GB
CLOSE
DIFFPROT
TESTPOINT
TRIP
BUS TRANS OA
TRANSFER
TRANSFER
BUS OFF
FU
BUS OFF
BUS
F T
O
BUS
OFF
OFF
GEN OFF
GEN OFF
BUS
APU GENBUS
OFF BUS
OFF OFF
ON ON
GEN 1 APU GENGEN 2
APU
P5-4 AC SYSTEM GENERATORAND APU PANEL
TRIP
115V ACGEN BUS 1
R349 XFRCONT RLY 1
MASTERCAUTION A
MASTER TESTAPRESS TO TEST
L7 BUS 1 OFF LIGHTMASTER DIM
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