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* 274 amps (nominal) for 300 seconds
* 340 amps (nominal) for 5 seconds.
Overcurrent Load Shed, Two Generator Operation
Galley relays that get power from the affected generator open.
AIRPLANES WITH GALLEY SWITCH;
After landing, move the galley switch to OFF and back to the ON
position to reset the galley relays.
AIRPLANES WITH CAB/UTIL SWITCH;
After landing, move the cabin utility switch to OFF and back to
the ON position to reset the galley relays.
If the overcurrent condition continues, the generator control
breaker (GCB) on the effected generator opens and the
associated bus tie breaker (BTB) will be locked in the open
position. This will result in an unpowered AC transfer bus.
Move the generator switch to OFF and back to ON to re-excite
the generator and close the GCB. The BTB stays locked open
until the GCU or BPCU that shows the DIST/BUS FAULT has had
power off and on.
Overcurrent Load Shed, Single IDG Operation
The bus power control unit (BPCU) opens the galley relays that
get power from AC transfer bus 2. If the overcurrent condition
continues, the BPCU opens the galley relays that get power
from AC transfer bus 1.
AIRPLANES WITH GALLEY SWITCH;
After landing, move the galley switch to OFF and back to the ON
position to reset the galley relays.
AIRPLANES WITH CAB/UTIL SWITCH;
After landing, move the cabin utility switch to OFF and back to
the ON position to reset the galley relays.
If the overcurrent condition continues, the BPCU opens both
main bus relays. The main bus relays are closed by selection of
a second source of AC power or by removal and reapplication
of power to the BPCU.
AC ELECTRICAL LOAD DISTRIBUTION - LOAD SHED - OPERATION
EFFECTIVITY
GUN ALL 24-50-00
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If the overcurrent condition continues, the GCU opens and locks
open the associated BTB. The BTB will stay locked open until
the GCU that shows the DIST/BUS FAULT has had power off
and on.
If the overcurrent condition continues, the GCU opens the
associated GCB. This results in unpowered AC transfer buses.
Move the generator switch to the ON position to re-excite the
generator and close the GCB.
Overcurrent Load Shed, APU/External Power Operation
The BPCU opens the galley relays powered by AC Transfer Bus
2. If the overcurrent condition continues the BPCU will open the
galley relays that get power from AC transfer bus 1. The BPCU
closes the galley relays if another source of AC power is
selected.
If the overcurrent condition continues, the BPCU opens both
main bus relays. The main bus relays closes by selection of
another source of AC power or by removal and reapplication of
power to the BPCU.
If the overcurrent condition continues, the BPCU commands
BTB 2 to open and lock open. If the overcurrent condition
continues, the BPCU commands BTB 1 to open and lock open. If
this corrects the overcurrent condition, the BPCU commands
BTB 2 to re-close.
AC ELECTRICAL LOAD DISTRIBUTION - LOAD SHED - OPERATION
EFFECTIVITY
GUN ALL 24-50-00
Page 14
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-50-00-110
AC ELECTRICAL LOAD DISTRIBUTION - LOAD SHED - OPERATION
AC ELECTRICAL LOAD DISTRIBUTION - LOAD SHED - OPERATION
EFFECTIVITY
GUN ALL 24-50-00
Page 15
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-50-00-110
CHAPTER
25
Equipment and
Furnishings
Subject/Page Date COC
EFFECTIVE PAGES
1 thru 3 Oct 10/2007
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25-10-00 (cont.)
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