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Utility Bus Shedding
During single-generator operation in flight, AC UTILITY BUS 1 and 2 are automatically load
shed, to reduce the electrical load on the remaining generator.
During ground operations, AC UTILITY BUS 1 and 2 are load shed when a single generator (or
external AC power only) is supplying AC power, and the flaps are not retracted.
ELECTRICAL
Description
Vol. 2 07−10−14
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
Manual load shedding of utility buses can be accomplished by pressing the AC UTILITY
switch/light on the ELECTRICAL POWER panel.
Load shedding is indicated by the illumination of the AC UTILITY switch/light and the
respective bus SHED icons on the AC ELECTRICAL synoptic page.
AC Utility Bus Shedding
Figure 07−10−13
AIR-DRIVEN GENERATOR (ADG)
Description
The ADG provides 115-volt, 400-Hz, 15-kVA power to the AC ESS BUS and 3B hydraulic pump, in
the event of a complete loss of AC power in flight. The ADG is located in the forward right fuselage
beside the nose gear, and is deployed automatically or manually. Once deployed, the ADG can
only be restowed when the aircraft is on the ground.
ELECTRICAL
Description
Vol. 2 07−10−15
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR-DRIVEN GENERATOR (ADG) (CONT'D)
Air-Driven Generator
Figure 07−10−14
Components and Operation
Air-Driven Generator
The ADG consists of an AC generator mounted on a pivoted support leg, and a variable-pitch
two-bladed propeller that turns in the airstream. The constant speed of the ADG is achieved by
using a counterweight system to control the propeller pitch angle. This ADG is commonly
referred to as the “dry ADG”.
ELECTRICAL
Description
Vol. 2 07−10−16
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR-DRIVEN GENERATOR (ADG) (CONT'D)
An internal heating element is installed around the circumference of the stator, to protect against
condensation or frost which may form when a cold soaked ADG enters a hot, high humidity
environment.
ADG Generator Control Unit
The ADG generator is controlled and monitored by the ADG generator control unit (GCU). The
ADG GCU provides the following functions:
• Monitors and controls ADG voltage output;
• Protects against overvoltage, overfrequency and underfrequency to the ADG BUS; and
• Provides a signal to the ADG auto deploy control unit, to energize the HYD PUMP 3B
transfer contactor, emergency AC transfer contactor, and emergency DC transfer
contactor when the ADG voltage and frequency are within limits.
ADG AUTO DEPLOY CONTROL Unit
Located on the lower center pedestal, the ADG AUTO DEPLOY CONTROL unit controls the
automatic deployment of the ADG.
Automatic deployment of the ADG occurs when:
• Both AC BUS 1 and AC BUS 2 become unpowered; and
• The aircraft is in flight.
Another ADG deployment prerequisite is that one of the three main generators must be on line
prior to both AC main buses going off. This prevents the ADG from deploying during ground
maintenance tests, with external power being connected and disconnected with the aircraft on
jacks.
The red EMER PWR ONLY warning EICAS message indicates loss of all normal electrical power,
and ADG deployment.
When the ADG unit is fully extended, the two-blade propeller is unlocked and rotates in the
airstream. Once the ADG voltage and frequency are within normal limits, the AUTO DEPLOY
CONTROL unit energizes the appropriate transfer contactors, and allows the ADG to provide
power to the AC ESS BUS and to hydraulic pump 3B via the ADG BUS.
The ADG AUTO DEPLOY CONTROL unit sends a signal to release the solenoid of the ADG
uplock mechanism.
ADG Manual Deploy Handle and ADG AUTO DEPLOY CONTROL Panel
Figure 07−10−15
ELECTRICAL
Description
Vol. 2 07−10−17
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR-DRIVEN GENERATOR (ADG) (CONT'D)
ADG Manual Deploy Handle
In the event of an auto-deploy failure, the ADG can be manually deployed using the ADG
manual deploy handle, located on the lower center pedestal. Pulling the handle manually
releases the uplock, allowing the ADG to deploy. In addition, the emergency AC transfer
contactor and emergency DC transfer contactor are energized immediately.
In the event the ADG fails, operating the ADG manual deploy handle enables the DC ESS
BUS to be supplied by the BATT BUS through the emergency DC transfer contactor.
　
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