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battery voltage. Additionally, in the event of an ALT 2 failure, the circuit
breaker panel Essential Bus will be powered from ALT 1 through the
Main distribution and Essential distribution buses in the MCU. Main
Bus 1, Main Bus 2, and the equipment Non-Essential Bus in the circuit
breaker panel are powered from ALT 1 through the Main Distribution
Bus in the MCU. The Avionics Non-Essential Bus in the circuit breaker
panel is powered from Main Bus 1.
Revision A5
P/N 13772-001 7-67
Cirrus Design Section 7
SR22 Airplane Description
Serials 0002 thru 1601, 1603 thru 1643 and 1645 thru 1662: 80A fuse.
NOTE
Serials 0002 thru 1601, 1603 thru 1643 and 1645 thru 1662: 100A fuse.
Serials 1602, 1821, 1840, 1863 & subs with optional Air Conditioning
system installed.
25A
25A
STARTER
50A
50A
125A
EXTERNAL
POWER
A/C 1
CONDENSER
A/C 2
FAN
COMPRESSOR/
CONTROL
BAT 1
SWITCH
LANDING
LIGHT
LANDING LIGHT
SWITCH
15A
30A
ALT 2
SWITCH
BAT 2 SWITCH
AVIONICS
ESSENTIAL RELAY
AVIONICS
NON-ESSENTIAL
RELAY AVIONICS
SWITCH
BAT 1
ALT 1
RELAY
FUEL OIL
ALT 1 ALT 2 PITOT
HEAT
ESSENTIAL
DIST
MAIN DIST
25A
25A
25A
25A
25A
VOLT REG
F ALT 2
B
F ALT 1
B
100A
40A
VOLT REG
GPS 2
ANNUN/ENGINE INST
MASTER CONTROL UNIT
CIRCUIT BREAKER PANEL
TURN COORD. #1
AVIONICS
ESSENTIAL
BAT 2
ALT 1
SWITCH
LOW
VOLTS
ATTITUDE #1
HSI /PFD #1
STALL WARNING
BATTERY 2
ALT 2
ESSENTIAL POWER
ESSENTIAL
AUTOPILOT
AVIONICS
COM 1
GPS 1
FUEL PUMP
TURN COORD. #2
MAIN BUS 2
ATTITUDE #2
HSI /PFD #2
CABIN LIGHTS
ALT 1
STARTER RELAY
NON-ESSENTIAL
MAIN BUS 1 AVIONICS NON-ESSENTIAL
PITOT HEAT/
COOLING FAN
12VDC OUTLET
STROBE LIGHTS
NAV LIGHTS
FLAPS
SKYWATCH/
TAWS
COM 2
ENCODER/XPONDER
WEATHER/
STORMSCOPE
AUDIO PANEL
MFD
AVIONICS
FUEL QTY/HOBBS
INST LIGHTS
PITCH TRIM
ROLL TRIM
ICE PROTECTION
SR22_FM07_1458G
Figure 7-13
Electrical System Schematic
Revision A8
7-68 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
BAT & ALT Master Switches
The rocker type electrical system MASTER switches are ON in the up
position and OFF in the down position. The switches, labeled BAT 2,
BAT 1, ALT 1, ALT 2 are located in the bolster switch panel
immediately below the instrument panel. These switches, along with
the AVIONICS power switch, control all electrical power to the
airplane.
Battery Switches
The BAT 1 and BAT 2 switches control the respective battery. Setting
the BAT 1 switch 'on' energizes a relay connecting BAT 1 to the MCU
Distribution Buses (also energizing the circuit breaker panel buses)
and the open contacts of the starter relay. Setting the BAT 2 switch 'on'
energizes a relay connecting BAT 2 to the circuit breaker panel
Essential Buses. Normally, for flight operations, all master switches will
be 'on.' However, the BAT 1 and BAT 2 switches can be turned 'on'
separately to check equipment while on the ground. Setting only the
BAT 2 switch 'on' will energize those systems connected to the circuit
breaker panel Essential Bus. If any system on the other buses is
energized, a failure of the Distribution Bus interconnect isolation diode
is indicated. When the BAT 1 switch is set to 'on,' the remaining
systems will be energized. To check or use avionics equipment or
radios while on the ground, the AVIONICS power switch must also be
turned on.
Revision A7
P/N 13772-001 7-69
Cirrus Design Section 7
SR22 Airplane Description
Alternator Switches
The ALT 1 and ALT 2 switches control field power to the respective
alternator. For ALT 1 to start, the BAT 1 switch must be 'on.' Setting the
ALT 1 switch 'on' energizes a relay allowing 28 VDC from the ALT 1
circuit breaker (Main Bus 2) to be applied to voltage regulator for ALT
1. For ALT 2 to start, either the BAT 1 switch or the BAT 2 switch must
be 'on.' Setting the ALT 2 switch 'on' energizes a relay allowing 28
VDC from the ALT 2 circuit breaker (Essential Bus) to be applied to
voltage regulator for ALT 2. Positioning either ALT switch to the OFF
position removes the affected alternator from the electrical system.
　
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