*
R GCB

*
R BTB

*
GSTR

*
Primary external power contactor (PEPC)

*
Circuit breakers

*
R TBB.

Holes in the panel cover permit access to the circuit breakers. Labels on the cover identify the circuit breakers.
There are bus power lights on the lower-right side of the panel. The red lights have numbers on them. A placard on the side of the panel identifies the lights by number.
Stud connectors for the large power cables are on the aft side of the panel. Electrical connectors for smaller circuits are on the forward side of the panel.
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777 AIRCRAFT MAINTENANCE MANUAL

ELMS -P100/P200 POWER PANELS

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ELMS -P300/P320 AUXILIARY AND GROUND SERVICE/HANDLING POWER PANELS

P300 Auxiliary Power Panel
P300 contains switching devices and circuit breakers for large electrical loads. You remove the panel cover to get access to these components in P300:
*
APB

*
GHR

*
GSSR

*
Secondary external power contactor (SEPC)

*
Circuit breakers.

Holes in the panel cover permit access to the circuit breakers. Labels on the cover identify the circuit breakers.
There are bus power lights on the lower, right side of the panel. The red lights have numbers on them. A placard on the front of the panel identifies the lights by number.
Stud connectors for the large power cables are on the aft side of the panel. Electrical connectors for smaller circuits are on the bottom of the panel.
P320 Ground Service/Handling Power Panel
P320 contains switching devices and circuit breakers for smaller electrical loads. You open the panel door to get access to these components in P320:
*
Ground handling TRU

*
Relay panel

*
Relays

*
Transformer.

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ELMS -P300/P320 AUXILIARY AND GROUND SERVICE/HANDLING POWER PANELS

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ELMS -P110 LEFT POWER MANAGEMENT PANEL

General
The P110 left power management panel contains switching devices and circuit breakers for smaller electrical loads.
Physical Description
You open the panel doors to get access to these components in the P110:
*
Relays

*
Relay panels

*
EEU

*
Signal conditioning modules (SCM).

Circuit breakers are in the doors of the panel.
A special section of P110 contains the EEU. This section shields the EEU circuit cards from electro-magnetic interference (EMI). You open the EEU cover door to get access to these EEU circuit cards:
*
Power supply unit (PSU) (2)

*
ARINC 629 (2)

*
I/O (6)

*
CPU (2)

*
Filter (3).

Labels on the ends of the EEU circuit cards identify them.
Training Information Point
You can remove the EEU circuit cards. Exposed connector pins make the cards electrostatic discharge sensitive (ESDS) components.
The CPU cards have software that is data-loadable. I/O cards 7, 8, and 9 are not in the P110 Panel. System configuration on the MAT will show blanks for these cards.
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777 AIRCRAFT MAINTENANCE MANUAL

ELMS -P110 LEFT POWER MANAGEMENT PANEL

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ELMS -P210 RIGHT POWER MANAGEMENT PANEL

General
The P210 right power management panel contains switching devices and circuit breakers for smaller electrical loads.
Physical Description
You open the panel doors to get access to these components in P210:
*
Transformer

*
SCMs

*
Relays

*
Relay panels

*
EEU

*
DC tie relay.

Circuit breakers are in the doors of the panel.
A special section of P210 contains the EEU. This section shields the EEU circuit cards from EMI. You open the EEU cover door to get access to these EEU circuit cards:
*
PSUs (2)

*
ARINC 629 (2)

*
I/O (6)

*
CPU (2)

*
Filter (3).

Labels on the ends of the EEU circuit cards identify them.
　
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