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A rating jumper (external wiring) across pins of galley ELCU power panel wiring connectors sets the current capacity of the ELCUs.
A control signal to the ELCU causes it to open or close. The control signal comes from the ELMS or other airplane systems.
Operation
The ELCU contactor connects ac power to the load when the control inputs satisfy the control logic.
When the ELCU closes, a voltage signal goes to the ELMS for ELCU status monitoring. If the ELCU opens due to a fault, it latches open and sends a latched open signal to the ELMS. The ELCU is reset when the control signal goes off and then back on or when you remove dc power to the ELCU.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details. 

AC DISTRIBUTION -ELECTRICAL LOAD CONTROL UNIT
Training Information Point
Each ELCU is a two-piece unit. Do not disassemble it. The mounting screws are captive, but can be unscrewed from the ELCU housing. With the screws removed the electronic section can move apart from the contactor section for shop repair.
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AC DISTRIBUTION -ELECTRICAL LOAD CONTROL UNIT

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AC DISTRIBUTION -28V AC TRANSFORMERS

General
The 28v ac transformers convert 115v ac power into 28v ac power. There are four transformers. They are in the ELMS power management panels and ground service/handling power panel. These are typical loads for the 28v ac power:
*
Signal conditioning card power supply

*
Resolver excitation

*
Sensor excitation

*
Service lights.

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777 AIRCRAFT MAINTENANCE MANUAL

AC DISTRIBUTION -28V AC TRANSFORMERS

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777 AIRCRAFT MAINTENANCE MANUAL

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AC DISTRIBUTION -FUNCTIONAL DESCRIPTION -POWER DISTRIBUTION

General
The ac distribution divides the electrical power buses into sections. The primary buses are in the ELMS power panels P100, P200, and P300. These are the primary buses of the electrical power ac system:
*
Left main ac

*
Left transfer

*
Right main ac

*
Right transfer

*
Ground handling ac

*
Ground service.

Left Main AC Bus
The left main ac bus divides into these buses:
*
Left transfer

*
Left utility

*
Left section 1

*
Left section 2.

The left section 1 bus supplies power to an ac transformer for the left 28v ac bus. The left section 2 bus is a P11 power source.
Left Transfer Bus
The left transfer bus divides into these:
*
P11 supply

*
Left transfer distribution bus

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* Standby ac bus.
The standby ac bus supplies power to an ac transformer for the 28v ac standby bus.
Tow AC Bus
A static inverter supplies power to the tow ac bus.
Right Main AC Bus
The right main ac bus divides into these buses:
*
Right transfer

*
Right utility

*
Right section 1

*
Right section 2.

The right section 1 bus supplies power to an ac transformer for the right 28v ac bus. The right section 2 bus is a P11 power source.
Right Transfer Bus
The right transfer bus divides into these:
*
P11 supply

*
Right transfer distribution bus.

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AC DISTRIBUTION -FUNCTIONAL DESCRIPTION -POWER DISTRIBUTION

Ground Handling AC Bus
The ground handling ac bus supplies power to the ground handling distribution bus.
Ground Service Bus
The ground service bus divides into these buses:
*
Ground service section 1

*
Ground service section 2.

The ground service section 1 bus supplies power to an ac transformer for the 28v ac ground service bus.
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AC DISTRIBUTION -FUNCTIONAL DESCRIPTION -POWER DISTRIBUTION

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