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Bus in the circuit breaker panel and will power the bus should the
voltage coming from the MCU distribution buses drop below the
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.
March 2010
Information Manual 7-69
Cirrus Design Section 7
SR20 Airplane Description
25A
STARTER
50A
50A
125A
EXTERNAL
POWER
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
Serials 1633, 1639 & subs with optional Blower Fan installed.
Serials 1005 thru 1581: 80A fuse.
Serials 1005 thru 1581: 100A fuse.
Serials 1359 and subsequent with SRV option: The airplane is equipped with
a single alternator, dual battery electrical system. This configuration is identical
to the dual alternator system except components used in conjunction with the
secondary alternator are removed.
NOTE
SR20_FM07_1722D
Figure 7-13
Electrical System Schematic
March 2010
7-70 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
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.
March 2010
Information Manual 7-71
Cirrus Design Section 7
SR20 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
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