ELECTRICAL POWER -INDICATION -ELECTRICAL MAINTENANCE PAGE 2
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
ELMS -INTRODUCTION
General
The electrical load management system (ELMS) has two basic functions that are independent of each other. First, the ELMS is a physical container for electrical equipment that it may or may not control. Second, the ELMS is a control system for many electrical components.
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777 AIRCRAFT MAINTENANCE MANUAL
ELMS -INTRODUCTION
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ELMS -GENERAL DESCRIPTION
General
The ELMS has seven panels that contain components to distribute electrical power. The ELMS also protects the electrical power system and controls many load-switching devices.
Distribution
All airplane electrical power goes through the ELMS panels for distribution. These are the ELMS panels:
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P100 Left power panel
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P200 Right power panel
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P300 Auxiliary power panel
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P320 Ground service/handling power panel
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P110 Left power management panel
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P210 Right power management panel
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P310 Standby power management panel.
Main and backup power go to the left, right, or auxiliary power panels. These power panels supply power to large loads (usually 25 amps or more). They also supply power to the power management panels and the ground service/handling power panel. The power management panels and the ground service/ handling power panel supply power to small loads (usually less than 25 amps).
Load Switching
The power management panels contain ELMS electronic units (EEU). The EEUs control and monitor load-switching devices in their related ELMS panels. However, the EEUs do not control all of the load-switching devices. The GCUs, BPCU, and backup generator converter directly control some of the large load-switching devices in the power panels. Airplane systems directly control some load switching in the power management panels.
The EEUs get data from the other electrical power control units and airplane systems. This data comes directly or from the ARINC 629 system buses. The EEUs use this data to manage the loads of the electrical power system.
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ELMS -GENERAL DESCRIPTION
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ELMS -COMPONENT LOCATIONS
Component Locations
All of the ELMS panels are in the main equipment center. Other ELMS components are in these panels. These are the seven ELMS panels:
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P320 Ground service/handling power panel
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P200 Right power panel
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P210 Right power management panel
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P300 Auxiliary power panel
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P100 Left power panel
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P110 Left power management panel
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P310 Standby power management panel.
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ELMS -COMPONENT LOCATIONS
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ELMS -P100/P200 POWER PANELS
P100 Left Power Panel
P100 contains switching devices and circuit breakers for large electrical loads. You remove the panel cover to get access to these components in P100:
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Electrical load control units (ELCUs)
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L GCB
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L BTB
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L TBB
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L CCB
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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-left 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.
P200 Right Power Panel
P200 contains switching devices and circuit breakers for large electrical loads. You remove the panel cover to get access to these components in P200:
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