The three-position BATT OFF/ON/EMERG
switch enables Nos. 1 and 2 batteries to be used
in the normal (on) or emergency modes. The
EMERG position of the switch is protected by
a spring-loaded balk.
Switch To ON
With both generators off line and external
power selected to OFF, setting the BATT
switch to ON uses No. 1 battery to (refer to Fig-
ure 2-9) close emergency contactors Nos. 1 and
2. With these contactors closed, No. 1 and
No. 2 batteries are connected in parallel to
energize bus bar PE via diodes.
Bus bars PS1 and PS2 are not energized un-
less external power is connected or a gener-
a t o r ( m a i n o r A P U ) i s o n l i n e . W h e n a
generator comes on line, both emergency
contactors remain closed, and a battery is
connected to the bus bar via closure of the
appropriate battery contactor. When the buses
are tied, both battery contactors close to con-
nect No. 1 and No. 2 batteries to the PS bus
bars for battery charging.
No. 1 BATTERY may be excessively
discharged and damaged if the roof
switch on panel DA and the entry
light switch on the forward cabin
bulkhead are left ON for long periods
while external power is applied.
This is because the vestibule roof
light and the entry light are con-
nected via their switches directly to
the No. 1 battery and will come on
irrespective of the position of the
E X T P W R , E X T BAT T C H G o r
BATT switches.
CAUTION
Revision 1
2-5
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 2-5. DC Bus Bar Control
Summary of Contents for 800 XP
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