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the battery power relay opens to prevent highcurrent
flow from the crossfeed bus to the
battery bus and protects the 200-amp current
limiters. This causes starting current from
the online generator and battery to flow
through the two starter relays and battery bus
to the starter. A blown 200-amp current limiter
splits the feed buses, preventing generator
paralleling.
Pressing the starter button for GPU starts, first
opens the battery disconnect relay to prevent
the battery cycles, then closes the start relay.
If GPU voltage is excessive, an overvoltage
sensor opens the external power relay and
breaks the circuit to the battery bus. External
power disable relays also disconnect the GPU
from the battery bus whenever a generator
relay closes, bringing a generator online.
CONTROLS AND
INDICATIONS
Control of DC power is maintained with a
battery switch and two generator switches
(Figure 2-7).
BATTERY SWITCH
The battery switch is on the pilot DC POWER
subpanel and has three positions: BATT, OFF,
and EMER.
If the battery switch is in the OFF position, the
battery bus isolates from all other buses in
the system with the exception of the emergency
power circuit-breaker bus.
When the battery switch is in the BATT position,
the battery power relay closes, completing
a circuit to the crossfeed bus. The emergency
relay deenergizes while the battery relay is in
the BATT position and completes a circuit to the
emergency buses from the crossfeed bus.
In the EMER position, only the emergency
power relay energizes, which connects the
emergency buses to the battery bus. These
buses receive power from the battery or external
power. When external power is not applied to
the aircraft and the generators are online, placing
the battery switch in EMER or OFF isolates
the battery from any charging source.
BATTERY DISCONNECT
SWITCH
A guarded battery disconnect switch (see Figure
2-3) is above the pilot armrest on the left side
console panel. The switch has two positions:
BATTERY (disconnect) and NORM. It disconnects
the battery and is used only for abnormal
operations involving stuck start relay or
battery overtemperature. Activating this switch
uses battery power to open the battery disconnect
relay on the ground side of the battery.
NOTE
The battery switch on the DC
POWER subpanel must be in the
BATT position for the battery disconnect
switch to operate.
If the battery ground is open, the battery cannot
supply electrical power to the aircraft or
receive a charge from the generators.
CITATION MUSTANG OPERATING MANUAL
2-10 510OM-00
Figure 2-7. Battery, Generator, and
Ignition Switches
Do not use the battery disconnect
switch for an extended time. The battery
disconnect relay will continue to
draw a small current from the battery
until the battery is discharged. The
battery disconnect relay will then
close, resulting in a very high charge
rate and probable overheat.
AVIONICS STANDBY
INSTRUMENT SWITCH
The avionics standby instrument switch is on
the AVIONICS pilot switch panel in the cockpit.
The switch can be set to the STBY INST,
OFF, or BATT TEST position. The switch
supplies power to the right avionics emergency
bus.
When the standby battery is powering the
standby instruments, the amber light adjacent
to the switch illuminates. Selecting BATT
TEST performs a capacity check on the
standby battery. A successful test is indicated
by a green light adjacent to the switch.
GENERATOR SWITCHES
Two generator switches (L GEN and R GEN)
are on the pilot DC POWER subpanel (see
Figure 2-7). The generator switches have three
positions: L (or R) GEN, OFF, and RESET.
Setting the switch to L GEN or R GEN allows
the GCU to close the generator relay and connects
the generator to its feed bus. The ammeter
indicates the generator output to the
feed buses.
With the switch in the OFF position, the generator
relay opens and the ammeter shows no
generator load to the feed buses.
Placing the switch in the spring-loaded
RESET position rebuilds field voltage to
provide a means of resetting a generator that
has tripped as a result of a fault condition.
ENGINE START BUTTONS
Two engine start buttons (L and R) (see Figure
2-7) on the pilot ENGINE START subpanel activate
a circuit to close the associated start relay
and allow starting current to flow from the battery
bus to the starter. A starter disengage (DISENG)
　
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