777 AIRCRAFT MAINTENANCE MANUAL
ELMS -P210 RIGHT POWER MANAGEMENT PANEL
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ELMS -P310 STANDBY POWER MANAGEMENT PANEL
General
The P310 standby power management panel contains switching devices and circuit breakers for smaller electrical loads.
Physical Description
You open the panel door to get access to these components in P310:
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SCMs
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Relay panel
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Relays
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EEU.
A special section of P310 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:
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PSUs (2)
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ARINC 629 (2)
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I/O (6)
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CPU (2)
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Filter (4)
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DC subsystem
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Special function.
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 ESDS components.
The CPU cards have software that is data-loadable. The dc subsystem card is for dc power control and cannot be programmed. The special function card is for unusual input/ output data handling and cannot be programmed. I/O card 7 is not in the P310 panel. System configuration on the MAT will show a blank for this card.
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ELMS -P310 STANDBY POWER MANAGEMENT PANEL
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777 AIRCRAFT MAINTENANCE MANUAL
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ELMS -FUNCTIONAL DESCRIPTION -PANELS
General
Each of the ELMS panels has self-contained wiring. All of the airplane wiring connects to the panels with external connectors. Line replaceable modules (LRMs) are inside the ELMS panels.
Power Panels
The power panels contain the large electrical load switching devices. One side of each panel has connecting studs for the large power cables. The other side has electrical connectors for smaller circuits. Bus power lights show when buses in the panel have power.
Inside each power panel is a backplane. Panel wiring and current transformers are behind the backplane. LRM mounting bases are part of the backplane. No wire connections are in front of the backplane.
LRMs plug into the mounting bases. The LRM power contacts are spring-loaded to ensure good contact with the mounting bases. Screws hold the LRMs in position. Plates cover any mounting bases that are not used.
Power Management Panels
The power management panels contain the smaller electrical load switching devices and the EEUs. These LRMs are in the panels:
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SCMs
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Current monitors
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Relays
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Circuit breakers
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EEU circuit cards
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Breaker.
The SCMs change input signals into a type that is satisfactory for the EEUs.
Relays are inside the panels. Smaller relays attach to relay panels that rotate down to expose the back of the relay panel. Larger relays attach to rails.
Circuit breakers are in the doors of the panels. Those monitored by the ELMS have a small circuit card attached to their base on the back of the panel door. One row of high ampere dc circuit breakers attach to the bottom face of the panels.
The EEU circuit cards are in a special section of the power management panels. You open a door to get access to the cards. Labels on the cards identify them.
Training Information Point
The screws of the power panel LRMs are captive (stay with the LRM).
Exposed connector pins on the EEU circuit cards make them ESDS components.
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ELMS -FUNCTIONAL DESCRIPTION -PANELS
Circuit breakers for the ELMS panels are below the surface of the panel cover or are in a recess in the panel doors. This prevents accidental damage to the circuit breakers, but you cannot easily see when a circuit breaker is open. Attach circuit breaker clips when you manually pull a circuit breaker to clearly show that it is open. Also supply power through the circuit breaker after you reset it to make sure it stays in. 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 電源 Electrical Power(8)
