AC GEN
1. ELEC CENTER:
MAIN (MEC): RACKS AND PWR CENTER
AFT (AEC) OR E8: APU RELAYS, APU BAT CHAGER
UPPER (UEC) OR E10: MAIN BAT, 4 TR’S, MAIN BAT CHAGER
AND INV
· P83 IS IN E8
2. THERE ARE:
2 APU GEN: 90 KVA (ONLY 747-100 HAS 2 APU GEN)
4 ENG GEN: 60 KVA
2 EXT GEN: 90 KVA, 250 A (ONLY 747-100 HAS 2 EXT GEN CONN)
2 BAT: (MAIN AND APU), 24V, 34 A OR 36 A
2 BAT CHAGER: 40A
6 TR: 75 A (EXT TR IS 20 A
1 INV: 1 PHASE, 500VA (IN E10)
4 LOAD CONT
1 VOLT BOOSTER: IS A DC TO DC CONVERTOR IN E10
1 SSB (SPLIT SYS BREAKER): IN SYNC BUS ISOLATES R/H AND L/H
4 BTB: ISOLATE AC BUS’S FROM SYNC BUS
4 GCB: CONNECT GEN’S TO AC BUS’S
4 GCR: CAN OFF THE GEN’S
2 APB: APU BREAKER
3. 4 TR ARE IN E10 AND EXT TR IN MEC ALSO CARGO HAND BUS HAS TR IN 747-100 ONLY
4. GCU CONTROLS: GCR, GCB, BTB
5. 3 TR FOR AC BUS 1,2,3 AND ONE FOR ESS AND ONE FOR EXT ONE FOR CARGO HAND
6. THERE ARE 6 DC BUS: DC1,2,3 + DC ESS + DC GND HAND + DC CARGO HAND
7. 2 LOAD CONT ARE IN P14 AND 2 ARE P15
8. STATIC INV IS IN E10
9. LOAD CONT FUNC:
CSD SPEED CONT AND IND
JOGGING SIG TO CSD
OVER SPEED TRIP SIG
LOAD DIVISION BETWEEN GEN’S
10.
11. ALL GEN ARE I/W EACH OTHER
12. APU PRODUCE POWER MORE THAN ENG’S GEN COZ OF GOOD COOLING
13. MAIN BAT IS IN E10 IN UEC (UPPER EQUIP CENTER)
14. APU BAT LOCATED IN TAIL AND USED FOR START AND CONT THE APU CIRCUITS
15. ALUMINUM WIRE USED TO SAVE WEIGHT BUT IN ENG AND APU COPPER USED
16. APU DOES NOT CSD COZ ECB HELD CONSTANT SPEED
17. THERE ARE 11 INTERCHANGEBLE BREAKER:
4 GCB (GEN CONT BRK)
4 BTB (BUS TIE BRK) CUT POWER OF SYN BUS
2 APB (APU PWR BRK)
1 SSB (SPLIT SYS BRK) DISCONN THE R/H AND L/H
18. THERE ARE 2 DIFFERENT BREAKER XPC (OR EPC) EXT PWR CONTACTOR
19. XPC HAS NO TRIP COIL AND ARE LOWER RATE
20 PARALLELING IS POSSIBLE ONLY FOR ENG GEN’S
21. APU AND EXT PWR PARALLELING IS PREVENTED BY SSB
22. INCOM PWR DISCONNECTS THE EXISTING
23. EXT PWR HAS PRIORITY FOR GND HAND AND GND SRVC BUS
24. EACH GCB CLOSING :
IF SSB IS OPEN : TRIPS OWN SIDE XPC AND APB
IF SSB CLOSE : TRIPS ALL , (ALSO APU FIELD CUT)
25. CARGO HAND BUS POWERED FROM APU2 OR EXT2, EXT2 HAS PRIORITY (THIS BUS IS ONLY IN B747-100)
26. CARGO HAND BUS AND SYN BUS CAN’T BE POWERED BY SAME SOURCE
27. CSD IS 8000 RPM
28. GEN OVERSPEED SENSOR IS ON CSD
29. A SOL DISCONN CSD FROM GEARBOX AND RESETING ONLY IN GND AND ENG OFF
30. PRESS LIT ILLUM IF CSD DISCONN
31. CSD AND GEN SHAFT WILL SHEAR AT HI TORQUE
32. IF CSD SPEED IS LOW A HYD ADDED TO OVERDRIVE
33. IF CSD SPEED IS HI HYD SUBTRACT TO UNDERDRIVE
34. A SIG FROM LOAD CONT GOES TO TRIM CSD (TRIM COIL OF GOVERNOR)
35. IF OIL LOW PRESS, CHARGE PRESS SW CLOSED AND PRESS LIT ON F/E
36. BYPASS VLV OF OIL/AIR COOLER IS TEMP AND PRESS SENSITIVE OPEN AT 72°C AND 160 PSI
37. OIL OUT BULB IS UPSTREAM OF SCAVENGE FILTER AND OIL IN BULB IS ON RESERVOIR
38. SPEED SENSOR:
BEFOR CLUTCH: FOR IND IN F/E
ON OUTPUT SHAFT: FOR GCU TO TRIP GCR AT PRESS<440 RPM
39. UNDER SPEED PRESS SW ON GOVERNOR SEND SIG TO GCU TO TRIP GCR AT 120 PSI
40. AN ADJUSMENT SCREW CAN INCREASE FRQ ±14 HZ EACH 360° CLOCKWISE
41. LOAD CONT HOLDS THE LOAD AT 6 KW FOR EACH GEN
42. GEN’S ARE MAGNETICALLY LOCKED SO CAN’T CHANGE SPEED
43. TRIP LEVEL IN GCU IS 11.5 KW
44. OIL IND SHOWS OIL OUT TEMP (120°C NORM) AND OIL RISE (15°C MAX NORM) WHEN SW PRESSED
45. GEN IS BRUSHLESS CONSIST OF:
PMG
EXCITOR GEN
MAIN GEN
CURRENT TRANSFORMER FOR EACH PHASE
DIODES ON ROTOR
46. EACH BALL BEARING HAS A SMALLER AUX BEARING WHICH SUPPORTS SHAFT AND SENDS SIG TO BEARING FAILURE LIT IF MAIN BEARING SHEAR
47. BEARING FAIL LIT ON CSD MUST DISC
48. KW/VAR IND ON P4:
MEASURE AND DISPLAY REAL POWER
MEASURE AND DISPLAY REACTIVE POWER
*CURRENT FROM PHASE B VOLTAGE FROM PHASE A, C
49. WATT IND USED TO SEE REACTIVE POWER DIVISION WHEN GEN’S PARALLED
50. VOLTMETER SHOWS LINE VOLTAGE OF PHASE B AND PMG VOLT(80VDC) IF GEN TEST SW PRESS
51. VOLTMETER READS ABOVE 100V ( COZ OF A ZENER DIODE )
52. FRQ/ RPM MEASURES THE PHASE B FRQ AND CSD RPM
53. AC ESS SW POS:
GEN1, 2, 3: AC ESS SUPP DIRECTLY FROM ENG’S BEFOR GCB
NORM: AC ESS SUPP BY AC4
OFF
54. INPUT POWER OF TR’S IS 3 PHASE 115VAC,400HZ
55. SSB (SPLIT SYS BRK) AUTO DISC BY BOTH BPCU AND WHEN MAN DISC BPCU2
56. OPEN LIT ON IF SSB OPENED
57. APU MECHANICAL FAULTS COZ APB TRIP AND APU S/D
58. PMG AC VOLT CONVERTED TO DC INSIDE GEN FOR GEN FIELD
59. AC ESS BUS NORMALLY FEEDS STBY AC BUS AND ESS TR
60. GALLY POWER CONT BY ELCU (ELEC LOAD CONT UNIT)
61. F/O AC RADIO BUS POWERED BY AC2 AND CAPT BY AC4
62. IF OPEN PHASE DET, FIRST BTB TRIPS, THEN IF FAULT EXISTS GCB TRIPS, BUT BTB CAN RECLOSE
63. FOR FUELLING STBY BUS MUST OFF TO PREVENT SUPPLY TO OTHER EQUIPMENT , STBY PWR ON LIT GOES OFF (ALSO BAT SW MUST ON)
64. FAULTS IND OF GEN’S ON P4 BY READ SW
65. READ AND EARASE SW MUST PRESS TO EARASE
66. GND HAND AND SRVC BUS POWERED BY EXT1 OR APU1 IN GND
67. GND HANDLING BUS IS POWERED AUTO (ONLY IN GND) FROM APU OR EXT WHEN EXT POWER PLUGGED
68. GND SERVICE BUS HAS PWR IN FLT FROM AC1, IT FEEDS BAT’S CHARGER, DRAIN MAST, FUEL SYS, …
69. GND HAND BUS FEED CARGO LOAD, TOWING, CLEAN RECEPTACLE, SRVC INT, …
70. APU GEN RPM CONT BY ELEC SPEED CONT IN ETC
71. UNDER VOLTAGE COZ OF GEN FAIL, OTHER FAULT FROM GCU FAIL
EXT PWR
1. THERE ARE 2 AMMETER: ONE FOR L/H AUX (APU1,EXT1), ONE FOR R/H FROM PHASE B
2.
3. POWER NOT IN USED LIT IS OFF WHEN XPC CLOSED MEANS GS BUS IS POWERED
4. GND HAND BUS POWERED WITH EXT BUS CONN WITHOUT XPC CLOSE
5. EXT1 IS AFT ONE
6. ESS TR POWERED FROM ESS BUS WHICH NORMALLY CONN TO AC4
7. GND HAND BUS DIVIDED TO 3 SEC: FWD CARGO, AFT CARGO, CARGO DOORS + LIT AND VACUUM
8. GND SERVICE BUS DIVIDED TO 2 SEC: UPPER, LOWER
9. BPCU MONITORS FRQ, VOLT AND PHASE OF EXT POWER
10. 2 XPC LOCATED IN P14 AND P15
11. 2 GND SRVC RELAY IN P14:
R14 (SELECT RELAY): CHOOSE APU1 OR EXT1
R15 (TRANSFER RELAY): CHOOSE AC1 OR R14
12. GND H/R IN P14 AUTO CONN EXT1 OR APU1 IN GND AND IN P15 FOR CARGO
DC GENERATION
1. BAT HAS THERMOSTATE ON TOP OPEN AT 58°C
2. MAIN AND APU BAT ARE I/W
3. MAIN BAT IS IN UEC AND APU BAT IN APU COMPARTMENT
4. A HEATING PAD ACTIVATED IN 2°C IN APU BATALSO BLOWER
5. ONE BAT SW FOR BOTH BAT
6. EACH BAT HAS:
1 THERMOSTAT: UPPER IN ONE CELL FOR O/H
2 FREEZ TEMP SENSORS: TO RUN HEATING PLATE UNDER BATT
1 TEMP SENSOR: TO RUN BLOWER
7. TEMP SENSORS ARE BELOW HEAT PLATE
8. BOTH BAT CHARGER SUPP BY AC GND SERVICE BUS
9. MAIN BAT CHARGER IS IN UEC (E10)
10. APU CHARGER AND APR ARE IN AEC(E8)
11. CHARGER MODES:
NORMAL
CONSTANT POTENTIAL (HI TEMP): IF V < 27.5 V
PULSING: WHEN BAT FULLY CHARGED
12. INV NORMALLY SUPP BY BATT BUS
13. INV AUTO RUN TO POWER AC STBY BUS IF AC ESS FAIL AND SW AT NORM
14. MANUAL ON POS ALLOW TO CHECK INV REGARDLESS OF AC ESS FAILURE OR NOT
15. VOLT BOOSTER WORK FROM 18 TO 29V AND HOLD BAT VOLT TO 23.5V FOR VHF1,VOR1.G/S1
16. THERE ARE 4 SW ON P4 FOR ISOLATION OF DC1,2,3 AND ESS
17. DC ESS BUS NORMALLY FEEDS STBY DC AND BAT BUS
18. STBY DC POWERED BY BAT BUS IF ESS FAIL
19. BAT STOP CHARGE AT O/H (58°C)
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