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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-113
General
The power distribution panels (PDPs) have the breakers and
many of the electrical buses.
Each PDP has a door on the front of it that is usually closed. The
front of each door has circuit breakers.
Location
PDP 1 (P91) is on the left side of the EE compartment. PDP 2
(P92) is on the right side of the EE compartment.
Power Distribution Panel 1
The power distribution panel 1 (PDP 1 or P91), has these
components:
* AC transfer bus 1
* Ground service bus 1
* DC bus 1
* Generator control breaker 1 (GCB 1)
* Auxiliary power breaker (APB)
* Bus tie breaker 1 (BTB 1).
There are four red lights on the forward and aft face of the
panel. These lights come on to warn you that electrical power is
active inside the panel. You can see the lights on the aft face
when you are in the forward cargo compartment. The lights
have these names and come on with these conditions:
* GEN 1 (on when IDG 1 supplies power)
* TIE BUS (on where there is power at the bus tie breakers)
* APU PWR (on when the starter-generator supplies power)
* EXT PWR (on when external power supplies power).
Power Distribution Panel 2
The power distribution panel 2 (PDP 2 or P92), has these
components:
* AC transfer bus 2
* Ground service bus 2
* DC bus 2
* Generator control breaker 2 (GCB 2)
* External power contactor (EPC)
* Bus tie breaker 2 (BTB 2).
There are four red lights on the forward and aft face of the
panel. You can see the lights on the aft face when you are in the
forward cargo compartment. These lights come on to warn you
that electrical power is active inside the panel. The lights have
these names and come on with these conditions:
* GEN 2 (on when IDG 2 supplies power)
* TIE BUS (on where there is power at the bus tie breakers)
* XFR BUS 1 (on when AC transfer bus 1 has power)
* EXT PWR (on when external power supplies power).
AC GENERATION - POWER DISTRIBUTION PANELS
EFFECTIVITY
GUN ALL 24-20-00
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D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-008
AC GENERATION - POWER DISTRIBUTION PANELS
AC GENERATION - POWER DISTRIBUTION PANELS
EFFECTIVITY
GUN ALL 24-20-00
Page 61
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-20-00-008
General
The generator control units (GCUs) and the bus power control
unit (BPCU) operate together to control AC power. With source
selection from the P5-4 AC systems, generator, and APU
module, the GCUs and BPCU control the bus tie breakers
(BTBs) and generator control breakers (GCBs) to keep one
electrical source on a transfer bus. A sequence of command
signals and breaker position signals must happen before an
electrical power source can supply power to a transfer bus.
External Power
The BPCU controls the use of external power. The BPCU
monitors the external power contactor (EPC), GCB, and BTB
positions by auxiliary contacts on each breaker. The BPCU also
monitors the quality of the external power. The BPCU gets
current (power) information from a current transformer (CT).
The BPCU monitors line voltage properties at the feeder lines
inside the power distribution panels.
The BPCU must find that all GCBs are open and external power
quality is good before it closes the EPC. The BPCU tells the
GCUs to send open commands to the GCBs and auxiliary power
breaker (APB) when you select external power on the AC
systems, generator, and APU module.
After the EPC closes, the BPCU commands the GCUs to close
the BTBs. The BTBs close and transfer bus 1 and transfer bus 2
receive external power.
When external power is on both transfer buses, selection of
another power source causes this sequence:
* GCU monitors for good power from the source
* GCU for the related source sends an open command to the
related BTB (the AGCU opens both BTBs)
* BTB open signal (position status message) goes to the BPCU
* GCU sends a close command to the related GCB.
With external power on only one transfer bus, selection of
another power source for that transfer bus causes this
sequence:
* GCU monitors for good power from the selected source
* GCU for the related source sends an open command to the
related BTB (and the EPC if the new source selection is the
APU)
* BTB open signal (and EPC open signal for APU selection)
　
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