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transfer relays. The DC power goes through the ground service
bus relay. The BPCU uses input from the forward attendant
panel to control the relays.
EXTERNAL POWER - GENERAL DESCRIPTION
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Automatic Control (System Protection)
The BPCU uses inputs from the external power current
transformer (CT) and feeder lines to monitor external power
quality. The BPCU controls the EPC position to protect airplane
systems.
The BPCU also removes power to some buses (load shed) to
protect the system.
Indication
The BPCU controls external power indication at the AC
systems, generator, and APU module and at the external
power panel.
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General
External power components are in the EE compartment and on
the right side of the forward fuselage. External power controls
are in the flight compartment and at the forward attendant
panel.
EE Compartment
The bus power control unit (BPCU) in on the E4 rack. The
external power contactor (EPC) is in the power distribution
panel 2 (PDP 2).
Flight Compartment
The P5-4 AC systems, generator, and APU module is on the P5
overhead panel. This module gives you manual control and
indication of external power.
Forward Attendant Panel
The ground service switch is on the forward attendant panel.
Forward Fuselage
The external power panel and receptacle is on the right side of
the fuselage, near the nose of the airplane. The external power
source connects to the airplane external power receptacle.
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Purpose
The external power panel is the location for external AC power
connection and power use indication.
Location
The external power panel is in the right lower portion of the
forward fuselage.
General Description
You open the external power panel access door to get access to
the panel and the connection. The panel has an external power
receptacle and a control and display section.
The control and display section has these components:
* EXTERNAL POWER CONN indicator
* External power NOT IN USE indicator
* FLIGHT INTERPHONE jack
* SERVICE INTERPHONE jack
* PILOT CALL switch
* NOSE WHEEL WELL light control switch.
EXTERNAL POWER CONN Indicator
The amber EXTERNAL POWER CONN indicator comes on when
the ground power plug is connected and the ground source is
operating.
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