Eclipse 500 System Manual page 248

Section 10. Electrical
10.5.6 Circuit Protection
Electrical components and wiring are protected by load shedding, contactors,
mechanical circuit breakers, and Electronic Circuit Breakers (ECBs). The ACS
monitors currents on the various buses so that any faults are detected. Faults on
buses cause contactors or ECBs to open, thereby isolating the faulty bus or buses.
This triggers CAS messages to indicate which buses are not powered. Over and
under-voltage protection is also provided for the starter/generators and external
power contactor.
LOAD SHEDDING
Under normal operation, the aircraft has two batteries and two generators to power
all of the avionics and electronic systems. If a situation arises where both generators
on the aircraft malfunction or become unusable the aircraft will continue to operate on
battery power. When this occurs, the ACS automatically will shed electrical
equipment to provide at least 30 minutes of electrical power to those loads that are
essential to continued safe flight and landing. This state is called "Battery-Only Load-
Shed". When Battery-Only Load-Shed occurs, the ACS automatically sheds or
"Locks" non-essential ECB's.
SMART LOAD SHED
Smart Load Shed functionality is specifically related to the Air Data System and
Integrated Sensor Suites. Should a failure of a redundant system component occur
and both generators become inoperative/malfunction, it is possible that a load shed
could deactivate the ISS providing the best information to the pilot.
Should both generators become inoperative with both of the ISS' fully operative, the
ACS will continue to power the ISS and components that it determines to be the most
accurate at the time.
Left and Right AHRS
Left and Right Air Data Computers (ADC)
Left and Right Angle of Attack Processors
Left and Right GPS (2)
Left and Right Pitot/AOA Heat
Left and Right Integrated Sensor Suite (ISS)
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Eclipse 5OO Systems Manual
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Version 2.0 April 2007