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Circuit Breakers, Fuses and Voltage Suppressors
Individual electrical circuits connected to the Main, Essential, and
Non-Essential Buses in the airplane are protected by re-settable circuit
breakers mounted in the circuit breaker panel on the left side of the
center console. Loads on circuit breaker panel buses are shed by
pulling the individual circuit breakers.
Transient Voltage Suppressors
Transient Voltage Suppressors (TVS) are installed in key ares of the
electrical system to protect the system from lightning strikes. During
lightning strikes, enormous energy spikes can be induced within the
aircraft electrical system. In the absence of any transient protection,
this unwanted energy would typically be dissipated in the form of highvoltage
discharge across the avionics and electrical systems of the
aircraft. By adding a high power TVS at key power entry points on the
electrical busses, unwanted energy from electrical transients is
allowed to dissipate through a semi-conducting pathway to ground.
• Caution •
If smoke and/or fumes are detected in the cabin and it is
suspected that this event was caused by a TVS failure, the
operator should confirm that there is no fire and perform the
Smoke and Fume Elimination checklist.
Essential Buses
The circuit breaker panel ESS BUS 1 and ESS BUS 2 are powered
directly by ALT 1 and ALT 2 from the MCU Essential Distribution Bus
through 30-amp fuses inside the MCU and also by BAT 2 through the
20-amp BAT 2 circuit breaker.
In the event of ALT 1 or ALT 2 failure, the Essential Buses in the circuit
breaker panel will be powered by the remaining alternator through the
March 2010
7-50 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Main Distribution Bus 1 or Main Distribution Bus 2 in the MCU. In the
case of both alternators failing, BAT 1 is connected directly to the
Essential Distribution Bus in the MCU and will power ESS BUS 1 and
ESS BUS 2. In the event of both alternators and BAT 1 failing, BAT 2 is
connected directly to ESS BUS 1.
Main Buses
The circuit breaker panel MAIN BUS 1 and MAIN BUS 2 are powered
by ALT 2 from the MCU Main Distribution Bus 2 and - in the event of
ALT 2 failure - by ALT 1 and BAT 1 from the Main Distribution Bus 2 via
the diode interconnecting the MCU distribution buses through 30-amp
fuses inside the MCU.
The 10-amp AVIONICS circuit breaker on MAIN BUS 1, controlled
through the AVIONICS master switch on the bolster switch panel,
powers all loads on the AVIONICS BUS.
The circuit breaker panel MAIN BUS 3 is powered by ALT 1 and BAT 1
from the MCU Main Distribution Bus 1 through a 30-amp fuse inside
the MCU. In the event of ALT 1 failure, BAT 1 will power MAIN BUS 3.
ALT 2 is prevented from powering MAIN BUS 3 by the isolation diode
interconnecting the MCU distribution buses 1 and 2.
Non-Essential Buses
The circuit breaker panel NON ESS BUS is powered by ALT 2 from the
MCU Main Distribution Bus 2 and - in the event of ALT 2 failure - by
ALT 1 and BAT 1 from the Main Distribution Bus 2 via the diode
interconnecting the MCU distribution buses through 30-amp fuses
inside the MCU. The Avionics Non-Essential Bus is powered through
the 10-amp AVIONICS circuit breaker on MAIN BUS 1 and is
discussed above.
The circuit breaker panel A/C BUS 1 and A/C BUS 2, is powered by
ALT 1 and BAT 1 from the MCU Main Distribution Bus 1 through a 30-
amp fuse inside the MCU. In the event of ALT 1 failure, BAT 1 will
power A/C BUS 1 and A/C BUS 2. ALT 2 is prevented from powering
A/C BUS 1 and A/C BUS 2 by the isolation diode interconnecting the
MCU distribution buses 1 and 2.
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-51
Electrical System Control
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 ESS
BUS 1. Normally, for flight operations, all master switches will be 'on'
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本文链接地址：
西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 2979(68)
