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lead-acid batteries connected in series to provide 24 volts.Both BAT 2
units are located in a vented, acid-resistant container mounted behind
the aft cabin bulkhead (FS 222) below the parachute canister. BAT 2 is
charged from the circuit breaker panel ESS BUS 1.
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-47
Figure 7-10
Electrical System Schematic
STALL
VANE HEAT
CABIN AIR
CONTROL
30A
BAT 2
SWITCH
BAT 2
AVIONICS
SWITCH
20A
8A
8A
20A
VOLT REG
BAT 1
SWITCH
EXTERNAL
POWER
MAIN DIST BUS 2
50A
50A
80A
BAT 1
RELAY
30A
30A
30A
STARTER
SWITCH
AVIONICS
NON-ESSENTIAL
RELAY
30A
30A
STARTER
125A
EXTERNAL
POWER RELAY
STARTER
RELAY
LANDING
LIGHT
LANDING LIGHT
SWITCH
7.5A
BAT 1
ALT 1
RELAY
MAIN DIST BUS 1
30A
FALT 1 B
100A
VOLT REG
MASTER CONTROL UNIT
ALT 1
SWITCH
DME / ADF
AVIONICS BUS
AUDIO
PANEL
WEATHER
TRAFFIC
XPONDER
STDBY
ATTD #2
MFD #2
MAIN BUS 1 CABIN LIGHTS
/ OXYGEN
FUEL QTY
KEYPADS
/ AP CTRL
AP SERVOS
AVIONICS
ICE
PROTECTION
ESSENTIAL BUS 2
ENGINE
INSTR
STALL
WARNING
PITCH
TRIM
ROLL
TRIM
GPS NAV
GIA 1
COM 1 ESSENTIAL BUS 1
ADC
AHRS 1
PFD #1
STDBY
ATTD #1
ESSENTIAL
POWER
BAT 2
A/C BUS 1
A/C COND
ALT 1
MFD #1
MAIN BUS 3
12V DC
OUTLET
YAW
SERVO
GPS NAV
GIA 2
COM 2
MAIN BUS 2
AHRS 2
PFD #2
FUEL
PUMP
AVIONICS
FAN 2
ALT 2
A/C BUS 2
CABIN
FAN
A/C COMPR
NAV
LIGHTS
STROBE
LIGHTS
NON-ESSENTIAL BUS
PITOT
HEAT
FLAPS
STARTER
AVIONICS
FAN 1
RECOG
LIGHTS
ALT 2
SWITCH
CIRCUIT BREAKER PANEL
SR22_FM07_2806A
ESSENTIAL DIST BUS
30A
30A
F ALT 2 B
80A
50A
EVS
CAMERA
March 2010
7-48 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Power Distribution
Power is supplied to the airplane circuits through three distribution
buses contained in the MCU; Main Distribution Bus 1, Main
Distribution Bus 2, and the Essential Distribution Bus. The three
distribution buses power the associated buses on the circuit breaker
panel.
Master Control Unit
The Master Control Unit (MCU) is located on the left firewall. The MCU
controls ALT 1, ALT 2, starter, landing light, external power, and power
generation functions. In addition to ALT 1 and ALT 2 voltage
regulation, the MCU also provides external power reverse polarity
protection, alternator overvoltage protection, as well as electrical
system health annunciations to the Integrated Avionics System. Power
is distributed to the airplane circuit panel buses through Main and
Essential buses in the MCU. The Main distribution buses are
interconnected by an 80-amp fuse and a diode. The diode prevents
ALT 2 from feeding the Main Distribution Bus 1. Additionally, since ALT
2 Bus voltage is slightly higher than ALT 1 voltage, bus separation is
further assured.
Essential Distribution Bus
The Essential Distribution Bus is fed by both Main Distribution Bus 1
and Main Distribution Bus 2 in the MCU through two 50-amp fuses.
The Essential Bus powers two circuit breaker buses through 30-amp
fuses located in the MCU;
• ESS BUS 1,
• ESS BUS 2.
Main Distribution Bus 1
The output from ALT 1 is connected to the Main Distribution Bus 1 in
the MCU through a 100-amp fuse. Main Distribution Bus 1 directly
powers the Landing Light through a 7.5-amp fuse and three circuit
breaker buses through 30-amp fuses located in the MCU;
• A/C BUS 1,
• A/C BUS 2,
• MAIN BUS 3.
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-49
Main Distribution Bus 2
The output from ALT 2 is connected to the Main Distribution Bus 2 in
the MCU through an 80-amp fuse. Main Distribution Bus 2 powers
three circuit breaker buses through 30-amp fuses located in the MCU;
• NON ESS BUS,
• MAIN BUS 1,
• MAIN BUS 2.
Electrical System Protection
　
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