BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 77

emergency DC2 transfer contactor (W off W
only) to close. This will allow the BATTERY
DIRECT BUS to provide backup power to
both the BATTERY BUS and the DC ES-
SENTIAL BUS.
EXTERNAL DC
External DC power can be connected through
the DC external contactor on the right rear
side of the airplane (Figure 2-21). External
power is used to power the battery direct bus
during ground servicing and for starting the
APU. The external DC power replaces the bat-
tery as a source of power. Whenever the ex-
ternal contactor is energized, the battery is
disconnected and external DC is connected
to the battery direct bus and to the APU start-
ing circuit. It also supplies a ground which
causes the IN USE light on the overhead panel
to illuminate.
LEGEND
UNPOWERED
POWERED BUS
BATTERY POWER
ESS ESS
TRU 1 TRU 2
D9
ESS DC BUS
D10
D5
EMER
DC 1 TC
BATT BUS
Figure 2-22. Battery Master Switch ON (W on W)
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Figure 2-21. DC External Power Connector
D8
D7
EMER
DC 2 TC
D4
W OFF W
BATTERY
MASTER
SENSOR
RELAY
D6
BATTERY
CONT
MAIN AC BUS 2
B32
BATT
CHGR
E8
MAIN
BATT
BATT DIR BUS
EXT
DC
CL 601-3A/R 2-17
L t é e
L t d .
EXT
DC TC