Eclipse 500 System Manual page 251

Section 10. Electrical
The ACS will open an ECB (AUTO/OFF) as necessary for system operation or load
shedding. An ECB in the AUTO/OFF state will not automatically reset when a circuit
fault is cleared, but can be reset by the pilot if appropriate. If an ECB is pulled by the
pilot, the ACS cannot close it. An ECB labeled "collared" was locked out by
maintenance and may be reset by the pilot on-ground only. Once an engine is
started or the aircraft is in flight, ECBs cannot be collared or uncollared.
The status of each ECB is maintained in non-volatile memory when the aircraft is
powered down. When the aircraft is powered up, the prior state of each ECB is
restored. However, all ECB's that are "pulled" reset upon power-up. All critical
functions are powered through redundant circuit breakers connected to different
power buses. This strategy permits continued operation of all critical avionic
functions even if a bus fault occurs or an ECB fails. If ACS communication with an
ECB is lost, or if it is unable to be switched off, an ECB CTRL FAULT advisory
message appears.
POWER DISTRIBUTION CENTERS
There are two Power Distribution Centers on the aircraft. They are considered Line
Replaceable Units (LRUs) for the electrical system.
The Forward Power Distribution Center is located aft of the forward pressure
bulkhead and contains the power distribution components for the left and right
forward busses with the exception of ECBU #s 1 and 2 which are separate LRUs.
Forward Power Distribution Center
ECBU #3
⎯
Left Battery Bus Contactor
⎯
Right Battery Bus Contactor
⎯
Systems Battery Bus
⎯
Left Forward Bus
⎯
Right Forward Bus
⎯
The Aft Power Distribution Center is located along the upper left fuselage wall
adjacent to the Left Avio Processing Center and contains the power distribution
components for the left and right aft power buses. The left and right bus components
are physically separated within the Aft Power Distribution Center and are electrically
independent with the exception of the Bus Tie Contactor which is used to connect the
left and right aft buses.
Aft Power Distribution Center
Left Side
⎯
• Left Forward Circuit Breaker
• Left Aft Bus
• ECBU #4
• Bus Tie Contactor (BTC)
Right Side
⎯
• Right Forward Circuit Breaker
• Right Aft Bus
Version 2.0 April 2007
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