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-Control and reconfigure the distribution system in response to manual switching or when a fault occurs. This
reconfiguration shall ensure the supply of the buses in accordance with an established priority relating to the power
sources available
-Ensure the coupling of the two channels on the ground when only batteries or external DC power are available, or
in flight when only one generator is available
-Control the automatic load shedding
-Isolate the faulted distribution buses when a short circuit occurs on a feeder or on a bus
-Distribute the electrical power to loads located in the aft of the aircraft
-Distribute the electrical power to secondary power centers located in the front fuselage of the aircraft
-Protect distribution cables from short circuit Additionally, there is an Auxiliary Power Center for the APU Generator.
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
07-01-05
ELECTRICAL
ELECTRICAL SYSTEM (Cont)
SECONDARY POWER CENTERS
The secondary power centers are located on the equipment rack in the front fuselage of the aircraft. They are fed by the distribution buses of the direct current power centers and distribute electrical power to the loads in the front fuselage of the aircraft.
HYDRAULIC MOTOR DRIVEN GENERATOR (HMDG) (OPTIONAL)
The optional HMDG system provides a non-time limited source of electrical power in the event total generated power is lost. The HMDG is powered by the left hydraulic system. It is rated for 65 amp and consists of a hydraulic motor that drives a DC generator. An ELEC HYD GEN ON (S) message will be displayed on the EICAS when the system is activated.
The HMDG is operated by the HYD GEN switch on the ELECTRICAL cockpit control panel.
CIRCUIT BREAKER PANELS
Two circuit breaker panels are located in the cockpit and are fed by the distribution buses of the secondary power centers. They distribute power to the loads which require pilot access to the associated circuit breaker.
Two other circuit breaker panels are located in the left and right equipment racks. They are also fed by the distribution buses of the secondary power centers.
COCKPIT FLOOR HEATERS
Four cockpit floor heaters are installed on the flight compartment floor, one on each side of the two control columns. Each is covered by a scuff plate to prevent damage to the heat strips. There are no pilot operated controls, as a temperature lim-iting circuit keeps the temperature between 68 ° F (20 ° C) and 95 ° F (35 ° C). Also an internal thermal switch prevents the floor heaters from an overheat condition.
The pilot’s floor heater is connected to the left equipment rack circuit breaker panel, and the copilot’s floor heater is con-nected to the right equipment rack circuit breaker panel.
Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
07-01-06
ELECTRICAL
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